AHP alphaMIG 190MP User manual

OPERATOR’S MANUAL
SAFETY AND USE INSTRUCTIONS
alphaMIG 190MP
Serial Number
Purchase Date (Attach Receipt to Cover For Proof of Purchase)
Need Information?
Contact:
[email protected]
925-391-3599
Technical Issues?
Contact:
[email protected]
925-391-3599 (Ext. 102)
Issue Date: 03/07/2022
Publication: AHP190MP-0307
© Ahp Welding Systems 380 Swift Ave. #11 South San Francisco, CA 94080

2
CONTENTS
Shipping Issues? 3
CA Proposition 65 Warning 4
Safety First Information 5
Safety Warning, Dangers, Cautions and Instructions 6
About the AlphaMIG 190MP 9
Warranty Statement 9
Specifications 10
Generator Operation Information 11
Duty Cycle Performance 11
Routine Required Maintenance 11
Shielding Gas and Regulator Information 12
Adjusting the Regulator 13
Installing the MIG Gun 14
MIG/Flux-Cored Polarity 14
MIG Wire Installation and Tensioning 15
MIG Techniques 17
TIG Polarity and Tungsten Type 18
Stick Polarity and Electrode Type 20
HF Point Gap Maintenance for TIG 22
Front Panel View and Identification of Features 23
Rear Panel View and Identification of Features 24
Operator Panel (Controls) 25
Series 15AK MIG Torch Break Down 26
26 Series TIG torch Break Down 27
Recommended Setttings 28
Explanation of Terms and Features 29
7 Pin Control connector Pin-Out 34
Trouble shooting 35
NOTICE: This AHP welding product is designed for use by individuals with a both knowledge and skills in MIG ,TIG
and Stick welding. It is designed with commercial operation in mind. AHP cannot be held accountable for instruc-
tion and training of inexperienced users or damage or malfunctions that may result from use by inexperienced us-
ers or improper installation. If you do not have the skill level or knowledge base to properly operate and install
this machine, do not use this machine until proper training and instruction has been received. This manual is not
intended to be an exhaustive welding guide or a “how-to” manual for beginners. Please seek out qualified instruc-
tion on welding that focuses on welding safety and operation if you are unsure of your capabilities before attempt-
ing to use this unit .

3
IMPORTANT! This unit has been thoroughly tested and inspected for function at the factory. However, you should be prepared to inspect
and test this unit completely within 72 hours after receipt. Please do not delay in doing this. Ahp needs to know if there is any damage
caused in shipping as soon as possible. Damage caused by shipping and discovered after 30 days due to lack of inspection will not be
covered under the free 30 day shipping policy.
Please contact us immediately should you have any questions or concerns about the welder after delivery. We’ll be glad to help.
SHIPPING ISSUES?

4
WARNING!
California Proposition 65 Warning:
This product, when used for welding or cutting, produces
fumes or gases which contain chemicals known to the State
of California to cause birth defects and, in some cases, can-
cer. (California Health & Safety Code § 25249.5 et seq.)
Warning: Cancer and/or Reproductive Harm
www.P65warnings.ca.gov
NOTICE:
Due to our constant effort to improve our products, specica-
tions are subject to change without notice or revision to this
manual. In addition, minor changes in product cosmetics,
accessory type and quantity may change without notice.
These do not constitute a major change in function or opera-
tion.
Ahp Welding Systems makes no warranty for merchantability
or tness for a particular purpose or application. Any claims
of such are expressly denied by Ahp Welding Systems. Fur-
thermore, Ahp Welding Systems does not accept liability for
injury or damages, consequential or incidental, resulting
from the use of this product or resulting from the content
found in this document or accept claims by a third party of
such liability.

5
SAFETY FIRST!
Ahp Welding Systems takes safety seriously. You should as well. Please read
this entire manual before using. Keep a copy of this manual available for all
employees or potential users of this machine to read and thoroughly review
before use.
No matter how detailed may be nothing can substitute for careful planning
and common sense required to operate and safe work environment.
Welding is an inherently dangerous activity. Failure to follow safety protocols
while welding may result in severe burns, blindness, severe shock, or death
from electrocution.
BE AWARE OF YOUR WORK AREA AND THE WHO OR WHAT IS IN IT!
AS THE USER OF THIS PRODUCT YOU ARE RESPONSIBLE FOR YOUR OWN
PERSONAL SAFETY AND FOR THE SAFETY AND SECURITY OF THE PEOPLE
AND ITEMS AROUND YOU!
If you feel you do not have the resources to provide a safe work environment,
or do not have the skills or (for whatever reason) the capability to safely oper-
ate this unit, do not use this unit until you seek professional instruction in safe
operation and care of this unit.
NOTICE:
Welding and cutting operations may generate undesira-
ble High Frequency (HF) and EMF energy. This can in-
terfere with surrounding electronic equipment such as
computers, routers, CNC equipment, televisions, radios,
uorescent lighting etc. If disturbance in surrounding
electrical and electronic equipment is noted, consult a
licensed electrician to help properly ground surrounding
equipment to limit the interference. This machine may
cause GCFI and ground fault outlets to malfunction.
This unit is designed to be operated on a dedicated,
properly grounded circuit.

6
Safety Warnings, Dangers, Cautions and Instructions
NOTICE. This unit manual is intended for users with basic knowledge and skillset in welding. It is
your responsibility to make certain that the use of this welder is restricted to persons who have read,
understand and follow the warnings and instructions in this manual. If you or the operator needs
further instruction, contact AHP welding support or seek qualified professional advice and training.
WARNING! High Frequency (HF) energy can interfere with the operation of pacemakers and can dam-
age pacemakers. Consult with your physician and pacemaker manufacturer before entering an area
where welding and cutting equipment is in operation and before using this welder. Some pacemak-
ers have limited shielding. Alert any users or customers of this potential problem.
WARNING! Use approved safety glasses with wrap around shields and sides while welding and work-
ing in the weld area or serious eye damage or loss of vision may result. Use a grinding shield in
addition to the safety glasses during chipping and grinding operations.
WARNING! When welding always use an approved welding helmet or shielding device equipped with
at least an equivalent of a shade 9 or greater. Increase the shade number rating as amperage in-
crease over 100 amps. Inspect helmet for cracks in lenses and in the helmet. Keep lens covers in
good condition and replace as necessary.
WARNING! Welding/cutting operations carry inherent risks which include but not limited to possible
cuts burns, electrical shocks, lung damage, eye damage and even death. Take all appropriate
measures to use proper Personal Protective Equipment (PPE). Always use leather welding gloves,
closed toe (preferably reinforced or steel toe leather shoes, and long-sleeved flame resistant clothing
(i.e. denim). Do not wear Poly/Nylon blend materials.
DANGER! Welding/cutting poses shock and electrocution risks. Keep this welding equipment dry. Do
not weld in the rain or where moisture accumulates. Use dry, rubber soled shoes, gloves and cloth-
ing when welding. Do not rest or contact work clamp (ground) when welding. Keep all parts of the
body insulated from the part being welded when possible. Do not touch terminals or connections
while the unit is on. Consider all parts to be “live” at all times even if no live work is being per-
formed. Do not use frayed welding cables.
CAUTION! Fires are possible but also preventable while welding. Always remove flammable rags,
papers, and other materials from the weld area. Keep rags stored in an approved flame proof canis-
ter. Keep a fully charged fire extinguisher at hand. Remove any fuels, oils, paint, pressurized spray
cans, and chemicals from the weld area. Make sure any smoke/fire detectors are function properly.
Do not weld on tanks, drums or barrels, especially if pressurized or sealed. Do not weld on any con-
tainer that previously held fuel or chemicals. Make sure the weld area is clear of flammable materi-
als such as grass or wood shavings solvents and fuels. Do not wear frayed or loose clothing. Visual-
WARNING! Welding gas cylinders are under high pressure. Keep all gas cylinders upright and
chained to a cart or held safely in a safety holding pen. Never transport gas cylinders in an enclosed
car van or other vehicle. Transport gas cylinders securely. Keep all cylinders capped while not in use
or during transport. Replace the cap on the cylinder when it is going to be more than 24 hours be-
fore use. Do not use or attempt to repair faulty regulators. Never weld on gas cylinders. Keep gas
cylinders away from direct sparks.

7
Safety Warnings, Dangers, Cautions and Instructions
DANGER! Welding and cutting operations pose serious inhalation hazards. Some of these hazards
are immediate while others are cumulative in their effect. Do not weld in enclosed spaces or in
areas without adequate ventilation. Fumes and gases released in the welding and cutting opera-
tions can be toxic. Use fans or respiration equipment to insure adequate ventilation if you are
welding in a shop or garage area. Do not weld on galvanized metal under any circumstance. You
may develop metal fume fever. Symptoms are similar to lu-like symptoms. Seek medical advice and
treatment if you are exposed to galvanized welding fumes.
If you experience any eye burning, nose or throat irritation while welding, these are signs that you
need more ventilation.
If you feel these symptoms:
• Stop work immediately and relocate work area with better ventilation.
• Wash and clean your face and hands.
• Stop work completely and seek medical help if irritation persists
DANGER! Never use brake cleaner or any chlorinated solvent to clean or degrease metal scheduled
to be welded or other related equipment in the area being welded. The heating of this cleaner and
its residue will create highly toxic phosgene gas. Small amounts of this vapor are harmful and
can lead to organ failure and death. If degreasing of a part is necessary, use Acetone or an ap-
proved pre-weld cleaner. Use the proper personal protective equipment (PPE) when handling any
cleaners/solvents.
DANGER! People with pacemakers should consult a physician and pacemaker manufacturer before
welding. There is a potential for damage or serious malfunction resulting in death. High Frequen-
cy energy (HF)/Electromagnetic Fields generated during welding can interfere with pacemaker sig-
nals, even permanently damaging it. Some pacemakers offer some shielding, but restrictions re-
garding amperage and HF starting of TIG arcs may be placed upon the individual. Warn all poten-
tial bystanders that they should exit the work area if they have a pacemaker or similar medical
equipment before welding. Severe electrical shock leading to injury or death may occur while using
the plasma cutter if the user becomes part of the circuit path. While the Amp output of the plasma
cutter is limited, the unit may produce an OCV of 300V or greater. Consult with a Physician if a
pacemaker is expected to be implanted.
DANGER! Never defeat or modify any safety guards or shields. Keep all safety covers and shields
in place.
Never place your fingers in or near a fan shroud or insert any object into the fan(s).
CAUTION! Trip Hazards exist around welders. Cords, cables, welding leads and hoses pose a trip
hazard. Be aware of their location and inform others of their location. Tape and secure them so
they will stay out of high traffic areas.

8
Safety Warnings, Dangers, Cautions and Instructions
CAUTION! Welded metal can stay hot long after welding is completed. Burns may occur. Always
wear gloves or use tongs/pliers when handling welded or cut metal. Remember the heat from the
metal may catch other material on fire. Always have a fire-proof area ready to place welded compo-
nents until they fully cool. Use soap stone or a metal marking marker to label the metal as “HOT”
to serve as a reminder to all present in the area.
CAUTION! Welding and cutting operations generate high levels of ultraviolet (UV) radiation which
can burn and damage skin and eyes. The intensity is so high that exposed skin and eyes can burn
in a few minutes of exposure. Minimize direct skin and eye exposure to this intense form of radia-
tion by using proper PPE and sun screen where appropriate.
CAUTION! Do not allow untrained, unqualified bystanders to observe welding. Do not allow others
without proper Personal Protection Equipment (PPE) suitable for welding to stand in the welding
area or to observe welding and welding related activities. If protection is not readily available, use
a welding screen to separate the welding area from the rest of the area. If no protection or screen
is available, physically exclude them from the welding area by a wall or other solid divider. Keep all
pets and young children away from the welding area.
CAUTION! Electromagnetic Fields can be generated by this welder and radiate into the work place.
The effect of EMF is not fully known. Exercise caution when welding by: NOT draping welding leads
(guns/cables) over your shoulders or arms, NOT coiling them around your body, NOT inserting
yourself directly between the cables, and by NOT contacting the unit while welding. DO keep the
work clamp connected as close as possible to the area of the weld and directly to the object being
welded whenever possible.
DANGER! Never touch connectors or fittings while this machine is turned on. Keep all safety covers
in place when not in use.

9
Specications and Need-to-Know Information
alphaMIG 190MP
About the AlphaMIG 190MP
The AlphaMIG 190MP is a class-leading multi-process design welder
from AHP. It is capable of MIG, DC TIG, and DC Stick welding. This
combination of functions allows the user to cover a broad spectrum of
welding needs. This unit’s design lends itself well to small fabrication
and body shops.
The MIG process gives the user the ability to nearly any metal, even
aluminum with ease. Additonally, this unit has the ability to operate
with the optional spool gun which allows the user to weld Aluminum
(1/8” to 1/4”).
The DC TIG function provides for three higher level TIG functions, not
found on most competitor’s models:
1) It provides HF start capability for DC TIG, which means a touch-
less start, which yields the highest quality contamination-free
welds.
2) It provides a gas solenoid, so gas flow is automatically con-
trolled in TIG mode. This eliminates the need for a gas valve TIG
torch.
3) It provides the ability to be used with the optional TIG foot pe-
dal, so amps can be varied and controlled within the range set
on the panel. provides the ability to make high quality welds on
virtually any metal except aluminum and magnesium.
The stick welding process provides excellent “on the job site” capabil-
ity for manufacturing and repair. This unit utilizes the latest in digi-
tally controlled IGBT inverter welding technology, while providing the
user with an easy-to-use interface. This unit will run most electrodes
up to 1/8” smoothly. However, E6010 is not recommended for use.
Please consider using E6011 if cellulose-type electrodes are needed.
The unit comes standard with the following items and features:
• Dual Voltage 120/240V operation capability
• 200A MIG, 180A DC TIG, 160A DC Stick Output
• Foot Pedal capable (Foot Pedal is sold separately)
• Spool Gun capable (Spool Gun is sold separately)
• Built in gas solenoid for MIG and TIG operation
• HF or Lift Start Modes for TIG arc starting
• 15 series MIG gun 2m (6.5 ft)
• 26 series TIG torch 4m (12.5 ft)
• 250A Stick Electrode Holder 2m (6.5ft)
• 200A work clamp 2m (6.5 ft)
• Billet Brass Floating Ball type MIG/TIG Gas regulator
• TIG starter kit of consumables
• 240V to 120V Stepdown pigtail adapter
Ahp Warranty Statement
WARRANTY ONLY APPLIES TO UNITS WITH PROOF OF PURCHASE
FROM AN AUTHORIZED DEALER. NO EXCEPTIONS. PLEASE FEEL FREE
TO REQUEST A LIST OF AUTHORIZED DEALERS.
The AHP Golden Circle Warranty:
All new AHP welders, shall be warrantied to the original owner for a
period to extend for 3 years from date of purchase against breakage,
malfunction, or other unit failure resulting from manufacturing de-
fect. The faulty unit will either be repaired or an exchange will be
made for a new or factory reconditioned unit at AHP Welds discretion.
The customer must contact the technical support team to review unit
failure so that the warranty claim can be established. Items such as
electrodes, contact tips, nozzles, cups, shields, liners etc, considered
to be consumable items, are NOT covered under warranty. Torches,
foot pedals and spool guns are warrantied for a period of 6 months.
Additionally, certain items such as torches, foot pedals and easily
serviced parts may be individually exchanged without returning the
entire unit assembly should a failure with these items occur, at AHP
Welds discretion. AHP Welds will not be responsible for time/contract
loss from unit failure, damages occurring from improper or unskilled
operation, damages resulting from improper maintenance, improper
wiring, poor quality power sources, abuse or neglect. Nor will AHP
assume responsibility for the customer's failure to heed/read safety
instructions, to read and understand operator's manual, obey occupa-
tional laws or to ensure the unit's safe operation complies with state
or local laws, personal injury arising from the inherent risks involved
with welding, including burns, electric shock or death. Warranty ex-
tends only to the machine, its accessories and parts contained inside
as stated above. No other warranty is expressed or implied.
In the event of unit failure or malfunction, the customer must contact
AHP to obtain a location of a designated return/repair facility. The
replacement/repaired unit will then be returned to the customer.
Additionally for USA customers, AHP offers shipping coverage in the
lower 48 states for a limited time. Please call with receipt to verify
shipping coverage status. After the shipping coverage time ends, the
customer shall be responsible for all shipping and handling costs
both ways of non-functioning units for repair or replacement. Cus-
tomers located outside of the USA lower 48 states will have to pay
shipping and handling charges both ways from the purchase date. It
is the customer's responsibility to adequately insure the unit, as AHP
is not responsible for lost or damaged returns. Labor coverage only
applies if the unit is serviced at our facility or one of our authorized
dealers. We will not reimburse the labor if the customer decides to
have a third-party or unauthorized repair technicians work on the
unit. View full warranty, terms of sale and shipping details here:
https://ahpwelds.com/

10
Specications and Need-to-Know Information
alphaMIG 190MP
AlphaMIG 190MP Specifications
Input Voltage Welding Process Operating Range A/V OCV
120V (± 10%) DC MIG 30-120A, 15.5-20V 70V
120V (± 10%) DC TIG 10-120A, 10.4-15V 70V
120V (± 10%) DC Stick 20-100A, 20.8-24V 70V
240V (± 10%) DC MIG 30-200A, 15.5-24V 75V
240V (± 10%) DC TIG 10-180A, 10.4-17.2V 75V
240V (± 10%) DC Stick 20-160A, 20.8-26.4V 75V
Input/Output Operating Range
Duty Cycle Range
Input Voltage Welding Process 25% 60% 100%
120V (± 10%) DC MIG 120A @ 20V 80A @ 18V 63A @ 17V
120V (± 10%) DC TIG 125A @ 15V 60A @ 13.2V 110A @ 12.5V
120V (± 10%) DC Stick 100A @ 24V 65A @ 22.6V 50A @ 22V
240V (± 10%) DC MIG 180A @ 23V 120A @ 20V 90A @ 18.5V
240V (± 10%) DC TIG 180A @ 17.2V 120A @ 14.8V 90A @ 13.6V
240V (± 10%) DC Stick 160A @ 26.4V 100A @ 24V 80A @ 23.2V
Input Demand Inrush / Rated Effective Current
Consult a local, licensed electrician before wiring your electrical connections.
Reference Article 630 of the NEC for correct welder wiring code information.
Voltage I1Max / I1Eff (Inrush/Rated)
120V 1Ph 50/60Hz 28.7 / 15A
240V 1Ph 50/60Hz 28A / 15A
Feature Range
Process DC MIG, DC TIG and Stick
MIG Wire Speed 60-425 IPM (No load)
MIG Wire Feeder 2 roller system with .023-.030” (.6-.8mm) V-groove roller inc.
TIG Start Type HF, Live Lift, Lift Start (with torch switch/Pedal)
Remote Function 2T/4T Switch Control Sequencer or Pedal Control
Pre/Post-Flow Auto/Off
Stick Electrodes E6013, E6011, E7014, E7018, 309L and others.
NOTICE: Not for use with E6010
Feature and Range
Weight / Dimensions / Other
33 lbs. / 12.5” H X 8.5” W X 17.5” L / Ingress Rating
IP21S
Use between 14 F and 104 F
Store between –20 F and 120 F
.
NEMA 6-50P
This unit uses a NEMA 6-50P for 240V use. This is the standard
welder plug for 240V 1 phase use in North America.
This unit is supplied with a 240V to 120V pigtail adapter. No
internal adjustment or change is required to use it on 120V.
Simply install the adapter. The unit will adjust automatically.
IMPORTANT: Be responsible. Consult a local, licensed electrician
before wiring your electrical connections. Reference Article 630 of
the NEC for correct welder wiring code information. The code is dif-
ferent for wiring a welder circuit than for household circuits.
CAUTION: Use only with extension cords 50 feet
long or less, rated for 240V welder 50A use, or
damage may result. For 120 operation, use only
with 30A rated cords, less than 25 feet in length.

11
Specications and Need-to-Know Information
alphaMIG 190MP
Generator Operation Information
This unit may be used with any clean power rated 240V
generator with a 7000W Surge Watt rating. Clean Power is
defined as 5% or less Total Harmonic Distortion (THD).
This means the generator produces a clean sine wave simi-
lar to what is produced by power companies. If operating on a
120V generator, a 30A receptacle must be available and adapted for
use. Additionally 5% or less THD is still required. The generator must
not share “duties” with other tools or appliances.
NOTICE: Operation with generators not rated by the generator manu-
facturer as a “clean power” source is prohibited and will void the war-
ranty. Many manufacturers produce a version or series of their gener-
ators that produce clean power. This is usually stated up front. If
not, consult the manufacturer of the generators to confirm THD.
Clean power generators are made in both inverter types and conven-
tional types of generators. Do not assume all inverter type generators
produce clean power unless the manufacturer states it. Clean power
is needed for most electronic equipment to prevent damage.
Duty Cycle Performance
The MIG/TIG/Stick duty cycle of this machine has been estab-
lished at 25% while operating at the following Amperages.
120V MIG: 120A, 120V TIG: 125A, 120V Stick 100A. 240V
MIG: 180A, 240V TIG: 180A, Stick: 160A
Duty Cycle is the amount of time, out of a solid 10 minute block of
time that the unit may operate at the rated setting. For the example
of 25% @ 180A, this means the unit may be operated up to 2.5
minutes continuously, or intermittently out of 10 minutes of time
before overheating. The balance of time remaining in the 10 minutes
(6.5 minutes in this example) should be while the unit is left to rest,
while continuing to run. As Amps are lowered, or as the ambient tem-
perature decreases below the 40 C testing benchmark, duty cycle will
increase. NOTICE: Maximum MIG output is at less than 25% duty
cycle. Wire diameters over .030” may cause the unit to exceed duty
cycle frequently.
It is not necessary to try to keep up with the duty cycle exactly by
timing it or recording it. The unit is equipped with a thermal sensor
which will trigger an interruption of operation if the temperature has
been exceeded. Keep in mind this is not a timed feature. A duty cycle
statement is based on time welding at a particular amperage, but
because so many variables exist, and ultimately the unit’s tempera-
ture is the regulating concern, duty cycle is determined by a preset
operating temperature threshold, rather than a timed one.
If you have triggered the duty cycle interrupt on this machine, allow
the unit to cool for a full 15 minutes. The unit should automatically
reset during this time, but allow a few more minutes so the machine
can cool sufficiently so as not to overheat quickly. If it does not reset
during this time, turn the machine off and back on to reset it.
Even though this unit is equipped with a duty cycle safety feature,
intentionally and repeatedly surpassing the duty cycle will shorten the
lifespan of the unit. Routine overheating damage will usually leave
signs that can be determined during warranty repair. Damage caused
by intentional abuse of the duty cycle will not be covered under war-
ranty.
If you find that you are constantly running into duty cycle issues, it is
likely you will need a bigger machine, or need to adjust your welding
strategies to comply with the duty cycle limits of this machine.
To assure maximum lifespan of the unit, never block the cooling vents
in the rear, sides, or front. Keep the unit 16” away, on all sides, from
any obstacle to free air flow such as a wall or partition.
Required Routine Maintenance
Most places where a welder is in operation floating and
flying debris is a factor. Dust, dirt and sparks are often
present in the air. The machine will draw these contami-
nants in during operation and they can be deposited inside
the machine onto critical components. These particles can conduct
electricity and create new circuit paths, not only causing poor opera-
tion, unit lock up, but it can also cause long term damage. For this
reason, the machine should be opened up and cleaned with dry, com-
pressed air on a regular basis, once every month in heavy use, and
ever 3 to 6 months under light use. If the unit remains stored most of
the time, dust still will accumulate, and this should be done at least
every 6 months. When not in use, keep the machine covered. Failure to
do so constitutes neglect and may void the warranty.
To clean and service this welder:
1. Unplug the welder. Wait 10 minutes for the capacitors to dis-
charge. (To prevent electrical shock or electrocution.)
2. Put on a pair of safety glasses to prevent debris from blowing
into your eyes during this operation.
3. Remove the top handle.
4. Remove the steel cover screws.
5. Pull the cover up and to the rear while carefully watching for
wires that may catch on the louvered vents of the cover.
6. Check all wires and connections to make sure they are seated
and/or tight.
7. Use dry compressed air (or “canned” air) to blow the air off con-
nections, boards, and fittings. If the unit is particularly dirty,
unseat the affected connectors themselves, and blow out the
connections as well.
8. Reassemble the unit. Do not forget the handle!
NOTICE: Opening the unit to clean and check connections will not void
the warranty. In fact it is required to maintain your in-warranty status
during the duration of your warranty. However, under no circum-
stances should you attempt to modify or make unauthorized changes
to the welder or its programming. To do so will void the warranty.

12
Specications and Need-to-Know Information
alphaMIG 190MP
Shielding Gas Information
This unit features two rear connectors for shielding gas. The MIG
and TIG gases are separated in this system and do not share
components and operate off of separate gas solenoids.
Before you connecting the shielding gas, please note that there
are actually two (2) connections on the rear for gas. One is for
MIG and the other is for TIG. Each connection is marked, but facing
the rear of the unit, the gas connection for TIG is on the left, and the
gas connection from MIG is on the right. Always double check which
connection you are using. The unit is only supplied with one regula-
tor, so keep the other connection capped with the supplied plastic cap
when not in use to prevent dirt and debris from entering the unit’s
fittings and clogging and sticking your gas solenoid. You may also
purchase another regulator and keep both tanks connected while
welding. Just remember to always keep any unused cylinder valve is
closed. Always close the gas valve when turning off the welder to
prevent unwanted leakage and wasted gas. Shielding gas may fill a
room if leaks occur and can cause asphyxiation.
The regulator is a floating ball type. This means that when gas is
flowing the ball in the clear cylinder will float, indicating not only that
gas is actively flowing, but also the amount of gas flowing through
the regulator. This type is more accurate in general than the gauge
type, and is easier to read at a distance. When installing the regula-
tor and making it ready for use, be sure to snug all fittings using two
wrenches. One will hold the stationary fitting, the other will be used
to turn the rotating fitting. If you do not hold the stationary fitting,
either on the regulator, or on the back of the unit, you can crack or
damage the fitting. Once installed, and all fittings have been tight-
ened, test all fittings for leaks with a spray of warm soapy water (or
leak detector) to check for leaks. If bubbles are present, retighten.
Do not use thread sealant, locking compound, anti-seize or tape to
seal the threads. If the threads do not seal, remove and check the
connections for debris or pieces of metal on the sealing surfaces.
When you open the cylinder valve, do so slowly and stand to the oppo-
site side of the cylinder. Do not stand directly in front or behind the
regulator, in case of damage to or malfunction of the regulator.
Open the cylinder slowly, but open the cylinder valve completely.
Cylinder valves may leak if they are not fully open or fully closed.
Gas flow rates will vary by process and cup/nozzle size For standard
TIG cup sizes, use at approximately 2.5 to 3 times the gas flow rate
than the cup number. As an example a 7 cup would be 17.5 CFH to
21 CFH, in a good work environment. Fpr MIG, gas flow rates typical-
ly range from 20 to 30 CFH, and may need up to 35 CFH for welding
Aluminum. Of course, the larger the nozzle, and greater the turbu-
lence in the area, greater gas flow rates may be needed. These is just
general rules. More or less gas may be used, depending upon the
circumstances.
To utilize this unit for both MIG and TIG, you will need more than one
type of gas. Use the information below to select the correct gas.
• All TIG: 100% Argon. No other gas is needed.
• MIG Steel: 75/25 Argon/CO2. (75% Argon/25% CO2). No other
gas should be used with this unit for steel.
• Stainless: Trimix or 98/2 Argon/CO2.. Trimix is expensive. 98/2 is
a cheaper alternative. Pure Argon should not be used.
• MIG Aluminum: 100% Argon. This is the only gas to be used
with Aluminum MIG.
IMPORTANT: This unit is not suitable for axial spray (a.k.a Spray Arc)
of steel or stainless stee because it is not large enough to sustain the
volts and amps to create a spray arc. However, for Aluminum, since
Aluminum sprays at a much lower threshold, and is the recommend-
ed way of welding Aluminum with the MIG process, this unit may be
used for light spray arc use with welding aluminum from 1/8” to 1/4”.
NOTICE: Place the unit at least 6 feet away from the weld area. The
cooling fan is powerful enough to blow the shielding gas off the weld.
Porosity, rapid tungsten consumption, and dirty welds may result.
Remember to select the proper gas for the type of welding you are
performing. Also double check the correct gas line is connected to
the correct fitting. This happens more often than you may realize!
GAS Connections

13
Specications and Need-to-Know Information
alphaMIG 190MP
Adjusting The Regulator
TIG and MIG flow rate requirements are different, typically.
However, the way you adjust them are centered around the
same principle. Use the guide below to adjust both.
• Switch the unit on. While holding the MIG gun or TIG torch
trigger (or while depressing the optional TIG torch pedal), start
opening the the regulator valve by twisting the regulator adjust-
ment knob counter clockwise As you open the valve, the floating
ball will begin to rise. NOTICE: To avoid spooling out and wast-
ing wire during this time, release the tension on the drive wheels
by flipping the tensioning lever to the down position before you
begin. This will release tension and allow the drive rolls to safely
turn without feeding any wire.
• For MIG, increase the gas flow rate to a beginning point of 20-25
Cubic Feet Per Hour (indicated on the clear gauge with the float-
ing ball by CFH). If MIG/Spool Gun welding Aluminum, increase
flow rate to 35 CFH. Read the middle of the ball for the best
reading. For TIG, use multiply the cup size by 2 to 3 to find the
approximate flow rate. Do not confuse pressure on the cylinder
gauge with the flow rate on the floating ball gauge. Pressure
present on the cylinder gauge does not mean gas is flowing.
However, a lack of pressure on the gauge may mean there is no
gas flowing.
• Once adjustment is completed release the trigger. The gas will
delay slightly until the post flow timer automatically shuts off
the gas flow. The ball will settle. If gas continues to flow after
the arc has stopped for more than a few seconds, the gas sole-
noid may have stuck. Contact AHP for maintenance (cleaning)
and repair solutions.
• When welding it may be necessary to increase or decrease gas
flow rate to compensate for conditions. If you are welding out-
doors or in drafty conditions, increase the flow rate until weld
porosity disappears. In extreme cases, you may need to set up a
tarp or plywood to serve as a wind-break. In mild conditions, if a
breeze is lightly blowing you can position your body to block the
wind. Alternatively, you can choose to weld with flux-cored wire
or use the stick function to eliminate this problem.
• If you are concerned about wasting gas, or think gas consump-
tion is too high, you may turn down the gas. While testing on
scrap metal, turn the gas down incrementally until bubbles and
porosity just begin to appear. Once they appear, adjust the
regulator slightly so that they once again disappear. Once they
fully disappear, add another full CFH and you will have a proper-
ly adjusted regulator.
• When pressure on the cylinder drops below 300 to 500 psi, it is
common to have to readjust the flow regulator to compensate for
the lower pressure. Pressures under 100 psi may create unsta-
ble gas flow. Once you reach 200 psi, have a replacement cylin-
der ready to change out. If you completely run out of shielding
gas while welding it is likely you may have some hidden porosity
in your welds, creating weak welds. Always change the cylinder
out when gas levels reach 75 psi.
NOTICE: If you are planning on welding during holidays or during
weekends, always take notice of the cylinder pressure well before
hand. This will allow you time to get another cylinder before stores
close for the holidays or weekends. If possible, you may want to pur-
chase a 20CFH cylinder in addition to the regular gas cylinder that
you lease or purchase so that you have a backup cylinder in case of
an emergency. A 20CFH cylinder will last an hour or two of welding.
These are relatively inexpensive and can even be bought “pre-loaded”
with gas in many chain hardware stores and farm stores. These can
also be refilled when empty.
Turning the adjustment knob counterclockwise (when viewed from
the top) increases flow rate. Turning the knob clockwise until it
seats will shut off gas flow at the regulator. Do not use the regu-
lator to shut off the gas flow. Shut off the gas flow at the cylinder
when the welder is not in use for more than 20 minutes.
Adjust the Regulator
Ball floats only when gas is flowing.

14
Specications and Need-to-Know Information
alphaMIG 190MP
Installing the MIG Gun
After inspecting the unit for power up, it is necessary to confirm
wire feed operation. This is a simple process that requires you to
install the MIG gun on the unit. To install the MIG gun:
• Locate the MIG gun in the accessory box. Uncoil the gun and
straighten it out.
• Refer to the drawing below. Line up the Euro-Connector on the end
of the gun with the connector on the unit, making sure the protrud-
ing pins are lining up with the corresponding hole.
• Once the pins are lined up, push the connector in until it is seated.
Hand tighten the collar nut clockwise. Do not overtighten or use
tools.
• Once the nut is tight, gently shake the connector to confirm that the
gun is fully seated and the nut is still tight.
• After you install the MIG gun, set the wire speed knob to maximum.
Open the MIG door so that you can see the drive feeder mechanism.
Set the wire feed control to the maximum setting. Pull the trigger
to check that the drive mechanism is turning. If it does not turn,
check the MIG gun connection once again. If the drive wheel fails to
rotate, contact technical support for further assistance.
Selecting Polarity
Selecting the correct polarity for the welding Without the cor-
rect polarity, weld quality and weldability of a metal will be an
issue. Incorrect polarity can also cause undesirable operation of the
welder such as excess spatter, birds nesting of the wire, wire/
electrode sticking, excessive Tungsten/consumable wear, poor pene-
tration and even arc instability. See the following images to deter-
mine which polarity should be used with your process. Always double
check, especially after switching over processes that you have the
correct polarity. In MIG, if you forget to change the work clamp but
change the polarity under the cover, or vice versa, you will not even
get a spark. If something doesn’t seem right about the way the weld-
er is welding, or there is no arc at all, always check your gun/torch
polarity first. Then check your work clamp location and make sure it is
direct to the part being welded. If this has been checked and things
still don’t seem to weld well, consider replacing the work clamp. In-
spect it for burns, corrosion, missing copper strap, damaged hinge
joint. Stop and inspect the cable for tightness also.
MIG/ Flux-Cored Polarity
MIG and self-shielded Flux-Cored are similar processes. However
MIG uses a shielding gas, while self-shielded Flux-Cored wire inner
core provides the shielding without gas. Because of the difference in
the way solid MIG wire is formulated and the way self-shielded Flux-
Cored wire is formulated, the polarity required to weld is different.
For MIG, the torch will be used with the wire feeder connected to the
positive terminal under the cover and the work clamp will be located
in the negative terminal on the front panel of the machine. For Flux-
Cored wire, the torch will be used with the wire feeder connected to
the negative terminal under the cover, and the work clamp will be
connected to the positive terminal.
The pictures below are shown with the MIG/Flux-cored gun removed to clearly illus-
trate the work clamp location.
IMPORTANT! Remove MIG Gun while using TIG and Stick pro-
cesses. Gun will remain live if connected. If it comes into contact
with metal, the MIG Gun may short out, and may cause damage
to the unit. Personal injury may also occur.
Rotate nut clockwise (hand tight).
MIG Gun Connector
MIG or Spool Gun
Connect Cable
To
(Under Cover)
IMPORTANT! Remove the TIG and Stick Torch while welding MIG
to prevent arcing and damage to the machine. The connections remain live and personal
injury may also occur.
MIG Po-
Work Clamp (-)
Control Line for Opt. Spool Gun

15
MIG is particularly susceptible to issues with poor work clamp con-
nections. Improper connection can lead to arc outages, and spatter.
When connecting the work clamp, always be sure that you have it
connected directly to the part being welded. Connecting to the table,
through a vice or fixture may cause arc instability and even loss of
weld power through resistance. If you are not able to connect direct-
ly to the part being welded, consider using a jumper wire, or at least
connect as close as possible and grind a clean connection point
where the work clamp will be. This will help achieve the best weld and
offer the best transfer of power to the weld
MIG Wire Installation and Tension
The spool carrier assembly consists of several parts. Each part must
be assembled correctly. See the illustration below. There are two
collars that support the 8” spool. There is an inner collar and an
outer collar. The roll is held in place by tension placed on the outer
collar by a small spring and a small finger nut. During installation of
the wire spool, pay attention to the outer collar direction when you
remove it. Viewing from the rear, the narrow shoulder of the collar
faces the inside. The wider side of the collar should be turned toward
the outside of the welder, facing the welder door when closed. If the
outer collar direction is reversed, you will have difficulty installing the
spring and the tension will be too tight. Installation of the wire
spool is slightly different depending upon the spool size. For 8”
spools, the spool rides on the narrow shoulders of the two collars.
The spool rotates on these collars. To install 4” spools, the spool is
installed so that it sits between the two collars and rotates on the
spindle stud.
NOTICE: The wire spool must be installed so that the wire unwraps
and feeds from the bottom of the spool. It should never be installed
so the wire comes over the top. When installed properly, the spool will
turn counter clockwise. See the following illustration for proper rota-
tion direction. Tension the spring with the finger nut until the spool
will only free wheel 1/4” turn when spun by hand. Do not let the
spool free wheel completely or the wire will unwind itself and can get
tangled. Don’t over tighten the spool, as this will cause rapid wear to
the feeder components. If you wish to extend the gun’s reach, or de-
sire to use 4” diameter rolls of wire, you may be interested in using
the spool gun function. Small diameter wire such as .023” wire is not
recommended to feed in standard MIG guns over 10 ft in length.
.030” wire should not be fed in guns over 12 ft in length. 4” rolls can
be fed directly from the machine however. But if you want maximum
convenience, the spool gun option is best. If you need to feed long
distances, you may want to purchase the SM100N or SM3035 spool
gun for use with this unit. However, .035” Aluminum wire is the best
choice for use in the unit whether you are welding with the main gun
with the poly liner, or if you using the spool gun. With .030” wire, the
maximum wire feed speed will be barely enough to keep up with the
burn back rate of the wire and many “burn back” to the tip events will
occur. Larger wire requires a slower wire feed speed to deliver the
same Amperage. This is why .035” wire is recommended while weld-
ing Aluminum. Minimum weld thickness for Aluminum is usually
considered between 14 gauge and 1/8” due to the spray arc nature of
it. The SM100N gun is calibrated and best synchronized for this unit.
Typically spool guns are used to weld Aluminum, and occasionally
Specications and Need-to-Know Information
alphaMIG 190MP
Connect Cable
To
(Under Cover)
IMPORTANT! Remove the TIG and Stick Torch while welding MIG to prevent arcing and
damage to the machine. The connections remain live and personal injury may also occur.
Flux-Cored
Polarity
Narrow Shoulder
Narrow
Shoulder
Inner
Collar
Wide
Shoulder
Tension
Spring
Nut
Outer
Collar
Stud
(Viewed from the Rear)
Spool Assembly
Spool Rotation
Work Clamp (+)
MIG or Flux-Cored Gun

16
small spools of flux-cored wire or stainless. Spool Gun polarity con-
nections are the same as in regular MIG or Flux-Core.
Once the wire spool has been installed, flip the tensioner lever down
and raise the top drive roll to the upper position. See the illustration
above. Gently guide the wire from the spool over through the wire
feeder and into the front section of the gun at least 6 inches. Make
sure the wire lays neatly in the groove. Hold it with your finger if
necessary as you lower the top drive roll down and raise the tension-
ing lever with your other hand. When complete the wire should look
like the illustration on the previous page. Hint: The wire on the spool
is usually bent and threaded through a small hole in the side of the
spool to lock it in place and prevent de-spooling of the wire. Keep
one hand on the wire spool to prevent despoiling and cut the wire
loose with a pair of wire cutters. Trim the wire to make sure the end
of the wire is straight and able to be threaded through the wire feed-
er mechanism and gun.
After the tensioner is raised back to the vertical position, confirm the
wire is still in the groove and is not riding up on the shoulders of the
drive roll.
Turn the welder on and adjust wire feed speed (IPM) to maximum.
Remove the gas nozzle by twisting it clockwise and pull. Unscrew the
contact tip as shown in the illustration below. Hold the gun cable and
gun straight as possible. Pull the trigger on the gun. The wire should
slowly begin to feed through the gun cable and eventually through
the gun. As the wire exits the gun, allow 3 to 4 extra inches of wire to
be fed out past the diffusor. Re-install the contact tip over the wire
and screw it in clockwise until it is tight. Be careful not to strip the
threads. Install the gas nozzle. Trim the wire before welding. See the
illustration below.
The unit comes equipped with .023” and .030” drive rolls. NOTICE: For
most purposes you will likely want to use .030” wire in this unit since it
covers the greatest range of metal thicknesses and amperages within the
capability of this unit. However, if you change wire size or type, you will
need to change the drive roll to the correct size and type.
This unit uses two drive rolls to feed the wire. The top drive roll is actually
an idler roll used to hold tension and keep the wire in the groove and is
not changeable. Only the bottom drive roll needs to be changed. The
bottom drive roll has two small grooves that are sized for .023(.025”)
and .030” wire. Additional sizes and types of drive rolls are available as
options. The standard installed drive roll is meant to feed hard (solid)
steel wire. The groove on this drive roll has a “V” shape designed for the
solid wire. A Flux-Cored drive roll has a serrated edge to the groove,
which grips the softer, cored wire. Viewing a flux-core drive roll from the
top, you will see a “zipper” like pattern. This should never be used to feed
hard steel or stainless wire or aluminum wire. This will result in damage
to the wire, metal flaking and possible plugging of the MIG gun liner. To
determine the exact size of wire and type you have, look at the side of the
Specications and Need-to-Know Information
alphaMIG 190MP
Feeding Wire
Tensioner
Upper drive roll arm
Gas Nozzle
M6 Contact Tip
Diffusor and Retaining Spring
Gun Neck
IMPORTANT: Always remove and install the gas nozzle by twisting clockwise.
Flux-Cored Cap
(not included, sourced from aftermar-
ket)
Trim wire to 1/4”-3/8”
(6mm– 9mm)
5
.6mm =.023”/.025”
.8mm= .030”
.9mm= .035”
1.2mm= .045” (3/64”)
Size/Type Stamping.
(The size is stamped on
same side as corre-
Trimming Wire
Drive Roll Selection
Consumable Assembly

17
drive roll. The size of the drive roll groove is stamped on the side of the
drive roll closest to the corresponding groove. The type of the drive roll
will also be stamped with a V if it is for solid hard wire. If it is stamped with
a “U”, this is a special drive roll for feeding aluminum wire. Aluminum
wire is best fed with a spool gun.
The drive roll is held in place by a black thumbscrew. Remove the screw
to expose and change the drive roll. The drive roll is mounted on a bush-
ing. The bushing should be held in place with one nger of one hand
while the other hand removes the drive roll. This will prevent both bushing
and drive roll from being removed from the wire feeder drive shaft. When
removing make sure that the square locating key is not dismounted. If the
key falls out, replace it before replacing the drive roll.
To feed properly, the wire needs to be tensioned before you begin weld-
ing. The tensioning lever has numbers on the dial. To increase tension,
rotate the tension lever clock-wise. Different types of wires require differ-
ent tensions. There is no exact tension that works for all wire types. How-
ever, for steel wire, you will generally tension to at least 4 on the dial. For
flux-cored wire, it may be only two or three. Wire diameter also plays a
small part in the amount of required tension that is needed. Regardless of
the wire type or wire diameter, follow the process below and refer to the
following illustration. Turn the unit on and pull the trigger so that the wire
extends approximately 1” beyond the gas nozzle.
• Find a small block of wood, such as a two by four, and secure it to
the welding table or other solid object. Do not test this on metal!
• Hold the gun approximately 2 inches off the wood. Aim the gun at the
block of wood so that the nozzle is at a 30 degree angle to the wood.
• Pull the trigger and allow the wire to contact the block.
• Increase wire tension so that the wire contacts the block of wood and
is forced to curl up. Continue holding the trigger so that two or three
full spirals are made.
• If the wire stops, or stutters during this process, let go of the trigger
immediately and increase tension.
• Adjust the wire until the stuttering or jerking disappears.
• Do not over-tighten the tensioner or use more tension than neces-
sary. When the wire begins to curl without any stoppage, the tension
is enough.
Specications and Need-to-Know Information
alphaMIG 190MP
4
5
Wood Block
Curl

18
Specications and Need-to-Know Information
alphaMIG 190MP
DRAGGING VERSUS PUSHING:
MIG Welding is fairly simple if you keep travel angle and direction in mind
when welding. MIG in general works best with a push motion. This will
provide the smoothest weld and best bead prole. Dragging in MIG can
cause excess spatter. However, If you are welding flux-core, the gun angle
is reversed and it is welded at a drag angle due to the flux accumulation
possibility in front of the weld. Remember: If it has gas, you use a push
angle. If it is gas-less you use a drag angle. The old welder’s saying “If it
has slag, you drag.” applies to Flux-Cored Wire welding.
PULL ≤15°
VERTICAL
YES
NO
OK
Problem Technique: The Gun is not being held vertical
from side to side. Wire is not being directed to the center
of the puddle. This concentrates heat on one side of the
joint and results in poor fusion on the neglected side. It
also can create more buildup on one side of the joint
than the other. Correction: Hold the gun so that the
angle of the neck stands perpendicular from side to side.
Correct Technique: The gun is held in a near vertical
position. A variance of 5 degrees or less is acceptable
from side to side. The purpose is to prevent the arc from
being concentrated on one side of the weld joint or the
other. This balances the heat on both sides of the joint
and keeps the bead centered. Don’t confuse this with
push or pull angle in the travel direction.
Correct Technique: The gun is angled toward the back of
the weld when traveling forward. This angle should not
exceed 15 degrees. This provides a narrower but more
deeply penetrating weld. Use this method when Flux
Core wire is being used. Use this method where the unit
may be reaching its maximum welding capacity. Not for
use with Aluminum wire.
Correct Technique: The gun can be angled toward the
front of the weld when traveling forward. This angle
should not exceed 15 degrees. This provides a wider and
generally more pleasing weld. However it is shallower
penetrating. This method typically allows a much better
view of the arc. Use for most types of welding unless
deeper penetration must be achieved.
PUSH ≤15°
YES
3/8”
The overall stick-out of MIG and Flux-Cored wire is important to creating a good weld. The distance of the stick-out of the wire from the
end of the contact tip to the weld puddle is the Contact-Tip-to-Work-Distance. For a small MIG like this typically hold 3/8-1/2” CTWD.
Flux-Cored wire is similar but is a bit more forgiving and able to hold a longer arc, up to 3/4”.

19
Specications and Need-to-Know Information
alphaMIG 190MP
TIG Polarity and Tungsten Type
Selecting the correct TIG polarity of the connections is
critical for correct operation. Incorrect polarity can lead to
rapid Tungsten consumption, bad arc stability, and refusal to
start. The TIG torch will always be connected to the negative
(-) terminal. This is called Direct Current, Electrode Negative
(DCEN -) or as “Straight Polarity”. (Polarity always refers to the con-
nection of the torch, not the work clamp. ) The work clamp will al-
ways be connected to the positive (+) terminal.
NOTICE: The work clamp is often referred to as a “ground” since
negative ( - ) polarity is often viewed being connected directly to
earth. However this is technically incorrect and a cause of confusion
since the negative polarity only completes the circuit, rather than
being grounded directly to Earth. A common issue is that people still
refer to this as “ground” and mistakenly connect the work clamp the
negative terminal as a result. Don’t forget that while TIG welding,
the work clamp will always remain in the positive terminal ( + ).
When transferring back to MIG or Stick, don’t forget to change the
polarity.
Ahp recommends Lanthanated 2% (blue band) Tungsten for all TIG
welding, whether welding in DC or AC modes. 1.5% Lanthanated
(gold band) is also a good choice. Alternatively, 2% Ceriated (gray or
orange band) also exhibits good performance, but does not have
quite the resistance to erosion/consumption at higher amperages
that are found in Lanthanated. Overall, however, Ceriated is a suitable
Tungsten type for most inverter welder general applications. Never
use pure tungsten (green band) or Zirconiated ( usually brown
band). These are designed and intended for transformer use only.
Arc instability and over-balling will result. 2% Thoriated Tungsten
(red band) may be used. However, as an Alpha particle emitter, Thori-
ated tungsten is a slightly radioactive emitter. Some areas of the
world have banned Thoriated Tungsten for this. But in general, Thori-
ated is still the standard for DC welding and has excellent arc proper-
ties. It’s been in use in the industry for many years. The main risk is
inhalation while grinding. Research Thoriated Tungsten before you
make your mind up one way or the other. Be informed.
There are other types and colors of tungsten rapidly becoming availa-
ble that are being promoted as 3-in-ones, tri blends, rare earth
blends, special treatments, etc. Keep in mind for general welding
purposes, these are still considered “novelty” products and most have
very little research to support their claims of superiority for or suita-
bility for particular applications Some include Zirconium, which has
little or no value to inverter welders. Additionally, quality control is
typically very poor. The amount included of the “special” blend of
each rare earth metal oxides is often miniscule and are allowed to
vary by as much as 40%. Again, research and make your own decision
concerning this. In particular, be sure to read the Safety Data Sheets
regarding the Tungsten that should be available on these products to
assist you in comparing apples to apples. Standard coloring is being
changed arbitrarily by some manufacturer’s to confuse the buyer, or
to try to promote and differentiate their own “special” product. Read-
ing the SDS can help clear up confusion and give you an indication of
formulation and quality control standards.
Tungsten Preparation
Proper Tungsten electrode preparation is important to arc stability
and cone shape. It even has a significant effect on penetration.
Different grind angles affect arc cone shape and penetration. Ex-
periment with them to find what works best for you. In general
though, a the length of the grind should not exceed 2.5 to 3 times the
diameter of the Tungsten.
The way you grind is as important is as important as the angle you
grind. Always grind the tungsten so that the grind marks line up with
the length of the Tungsten. Grinding radially will cause arc instabil-
ity.
NOTICE: On a DC Inverter TIG, you should never ball your Tungsten
electrode. A ball is only used on older transformer models for weld-
ing Aluminum. If your tungsten balls, it’s likely the cause is incorrect
TIG Torch (-)
IMPORTANT! Remove MIG Gun while using TIG and Stick pro-
cesses. Gun will remain live if connected. If it comes into contact
with metal, the MIG Gun may short out, and may cause damage
to the unit. Personal injury may also occur.
Work Clamp (+)
Remove MIG Gun
Connect Torch switch or foot pedal to Control
Shielding Gas Line

20
Specications and Need-to-Know Information
alphaMIG 190MP
polarity. Stop and check your polarity and gas flow is the Tungsten is
rapidly consumed.
Use the guide below to help you get the best performance out of your
Tungsten electrodes.
Low cost, economical purpose-built Diamond coated Tungsten grind-
ers have revolutionized the industry. These will usually have pre-
drilled holes/slots to guide you to quickly and safely grinding the
correct angle.
However, if you do not have one, you may use a bench grinder with a
fine grit stone. Keep the stone dedicated to the task of only grinding
Tungsten to prevent contamination of the electrode.
CAUTION: Grip your Tungsten firmly so the Tungsten is not snatched
from your hands. Use safety glasses, and gloves when grinding.
See below for proper and improper grinding examples.
Stick Polarity and Electrode Types
Stick welding is usually performed in DC with the electrode
positive (DCEP+), or “ Reverse Polarity”. Some electrodes
may be used in either polarity. For example, the E6011 may
be operated either in DCEP, DCEN. Some people mistake it for
an AC only rod, because of its ability to be used with old style trans-
former “buzz box” welders that only produce AC current, but in reality
it will operate just as well, if not better on DCEP. In most cases, even
if a welding rod allows operation with DCEN,it will typically perform
better in DCEP. a very rare occurrence. The illustration on the next
page depicts the standard connection for most welding rods. Always
consult your welding rod manufacturer’s recommendation as an ulti-
mate source of information. Usually the box or can will have polarity
and Amp range recommendations on it if you are in doubt about
settings or polarity.
Correct length-wise grind.
Smooth starts, stable arc.
Incorrect radial grind.
Hard starting, Arc starts
up in Cup, Unstable arc.
DC <50 A
2.5 – 3 X Ø (DIAMETER)
Pointed for low
Amp DC use.
Approx. 60°.
DC >50 A
Pointed but tip is
slightly truncated
for high Amp DC
use. Approx. 60°
Incorrect use. Do not ball
Tungsten. Hard starting,
Unstable, wandering arc.
Start with a slight upward
angle. Turn Tungsten at a
slow, steady rate while
grinding evenly.
Gradually increase angle
and continue to twist
until point is created.
NOTICE: Never grind sideways as
shown. This will create a radial
grind pattern and cause arc insta-
bility and hard starting.
Start with a slight upward
angle. Turn Tungsten at a
slow, steady rate while
grinding evenly.
Gradually increase angle
and continue to twist
until point is created.
NOTICE: Never grind sideways as
shown. This will create a radial
grind pattern and cause arc insta-
bility and hard starting.