MK Products CobraTig 150 SM 254-153 User manual

Product: CobraTig®
Manual: 091-0675
Serial: 13110001
Voltage Rating: 100/120/208-
220/230-240VAC
Revision: Nov 2013 Rev B
Model Number: 254-153
254-252
CobraTig®150 SM
Owner’s Manual

Table of Contents
INTRODUCTION .......................................................................1
Section 1 Technical Information...........................................2
Section 2 Mechanical Information........................................2
Section 3 Weldhead and Torches.........................................2
Section 4 Connections ........................................................3
Section 5 Operation............................................................5
Section 6 Main Menu .........................................................6
Section 7 Weld Manual ......................................................6
Section 8 Weld Orbital........................................................8
Section 9 Recall Program ....................................................9
Section 10 Save Program....................................................10
Section 11 Auto Program Generator.....................................11
Section 12 Print Menu .......................................................12
Section 13 Calibration Menu................................................14
Section 14 Communication Menu.........................................16
Section 15 Setup Menu.......................................................17
Section 17 Diagnostic Menu ...............................................18

Declaration of Conformity for
European Community (CE) Products
Note This information is provided for units with CE certication (see rating label on unit).
Manufacturer’s Name: MK Products, Inc.
16882 Armstrong Ave.
Irvine, CA 92606
Declares that the product: CobraTig® 150 SM
conforms to the following Directives and Standards:
Directives
Low Voltage Directive: 2006/95/EC
Electromagnetic Compatibility (EMC) Directive: 2004/108/EC
Standards
Electromagnetic Compatibility, (EMC): EN 60974-10: 2007
Torches And Guns For Arc Welding, EN 60974-7: 2005

CobraTig®150 Owner's Manual - Page i
SAFETY CONSIDERATIONS
ELECTRIC ARC WELDING EQUIPMENT
CAUTION : READ BEFORE ATTEMPTING INSTALLATION, OPERATION
OR MAINTENANCE OF THIS EQUIPMENT
1-1 INTRODUCTION
This equipment is intended for ultimate
applicationbycommercial/industrialusers
and for operation by persons trained and
experiencedintheuseand maintenance
of welding equipment. Operation should
notbeundertakenwithoutadequatetrain-
ingintheuseofsuchequipment. Training
isavailable from many public andprivate
schools or similar facilities.
Safe practices in the installation, opera-
tion and maintenance of this equipment
requirespropertraining in the art,a care-
ful study of the information provided with
the equipment, and the use of common
sense. Rules for safe use are generally
provided by suppliers of welding power
sources,compressed gas suppliers,and
electrode suppliers. Careful compliance
with these rules will promote safe use of
this equipment.
The following Safety Rules cover some
of the more generally found situations.
READ THEM CAREFULLY. In case of
any doubt, obtain qualied help before
proceeding.
1-2 GENERAL PRECAU-
TIONS
A. Burn Prevention
ELECTRICARCWELDINGPRODUCES
HIGH INTENSITY HEATAND ULTRAVI-
OLET RADIANT ENERGY WHICH MAY
CAUSE SERIOUS AND PERMANENT
EYE DAMAGEAND WHICH MAY DAM-
AGE ANY EXPOSED SKIN AREAS.
Wear helmet with safety goggles or
glasses with side shields underneath,
appropriate lter lenses or plates (pro-
tected by clear cover glass). This is a
mustforweldingor cutting (and chipping)
to protect the eyes from radiant energy
and ying metal. Replace cover glass
when broken, pitted, or spattered.
Medical first aid and eye treatment.
First aid facilities and a qualied rst aid
person should be available for each shift
unless medical facilities are close by for
immediate treatment of ash burns of the
eyes and skin burns.
Wear protective clothing - leather (or
asbestos) gauntlet gloves, hat, and high
safety-toe shoes. Button shirt collar and
pocket aps, and wear cufess trousers
to avoid entry of sparks and slag.
Avoid oily or greasy clothing. A spark
may ignite them.
Flammable hair preparations should not
be used by persons intending to weld
or cut.
Hot metal such as electrode stubs and
work pieces should never be handled
without gloves.
Ear plugs should be worn when working
on overhead or in a conned space. A
hard hat should be worn when others work
overhead.
B. Toxic Fume Prevention
WARNING: The use of this product may re-
sult in exposure to chemicals known to the
StateofCalifornia to cause cancer andbirth
defects or other reproductive harm.
Adequateventilation. Severediscomfort,ill-
nessordeathcanresultfromfumes,vapors,
heat,oroxygenenrichmentordepletionthat
welding (or cutting) may produce. Prevent
them with adequate ventilation. NEVER
ventilate with oxygen.
Lead-,cadmium-,zinc-,mercury-,beryllium-
bearingand similar materials, whenwelded
orcut,may produce harmful concentrations
oftoxicfumes. Adequatelocalexhaust ven-
tilation must be used, or each person in the
area, as well as the operator, must wear an
air-supplied respirator. For beryllium, both
must be used.
Metals coated with or containing materials
that emit toxic fumes should not be heated
unless coating is removed form the work
surface, the area is well ventilated, or the
operator wears an air-supplied respirator.
Work in a conned space only while it is
being ventilated and, if necessary, while
wearing an air-supplied respirator.
Gas leaks in a conned space should be
avoided. Leakedgasinlarge quantities can
changeoxygen concentration dangerously.
Do not bring gas cylinders into a conned
space.
Leaving conned space, shut OFF gas sup-
plyat source toprevent possible accumula-
tion of gases in the space if downstream
valves have been accidentally opened or
left open. Check to be sure that the space
is safe before reentering it.
Vaporsfromchlorinatedsolventscanbe de-
composed by the heat of the arc (or ame)
to form PHOSGENE, a highly toxic gas,
and other lung and eye irritating products.
The ultraviolet (radiant) energy of the arc
can also decompose trichloroethylene and
perchloroethylenevaporstoformphosgene.
DONOTWELDorcutwheresolventvapors
can be drawn into the welding or cutting
atmosphere or where the radiant energy
can penetrate to atmospheres containing
even minute amounts of trichloroethylene
or perchloroethylene.
C. Fire and Explosion Prevention
Causes of re and explosion are: combus-
tibles reached by the arc, ame, ying
sparks,hotslag, or heated material,mis-
useof compressed gases andcylinders,
and short circuits.
BE AWARE THAT ying sparks or fall-
ing slag can pass through cracks, along
pipes, through windows or doors, and
through wall or oor openings, out of
sight of the goggled operator. Sparks
can y many feet.
To prevent res and explosion:
Keepequipmentcleanandoperable,free
of oil, grease, and (in electrical parts) of
metallic particles that can cause short
circuits.
Ifcombustiblesare in area, doNOTweld
or cut. Move the work if practicable, to
anareafreeofcombustibles. Avoidpaint
spray rooms, dip tanks, storage areas,
ventilators. Iftheworkcannotbe moved,
movecombustiblesatleast35feetaway,
outofreachofsparksandheat;orprotect
against ignition with suitable and snug-t-
ting, re-resistant covers or shields.
Wallstouchingcombustiblesonopposite
sides should not be welded on (or cut).
Walls, ceilings, and floor near work
should be protected by heat-resistant
covers or shields.
Fire watcher must be standing by with
suitable fire extinguishing equipment
during and for some time after welding
or cutting if:
1. Appreciable combustibles (includ-
ing building construction) are within
35 feet.
2. Appreciable combustibles are fur-
ther than 35 feet, but can be ignited by
sparks.
3. Openings (concealed or visible) in
oors or walls within 35 feet may expose
combustibles to sparks.
4. Combustibles adjacent to walls, ceil-
ings, roofs, or metal partitions can be
ignited by radiant or conducted heat.
Hot work permit should be obtained
before operation to ensure supervisor’s
approvalthatadequateprecautionshave
been taken.
Afterworkisdone,checkthatareaisfree
of sparks, glowing embers, and ames.
An empty container that held combus-
tibles, or that can produce ammable or
toxic vapors when heated, must never
be welded on or cut, unless container
has rst been cleaned in accordance with
industry standards.
This includes: a thorough steam or
caustic cleaning (or a solvent of water

CobraTig®150 Owner's Manual - Page ii
washing,dependingonthecombustible’s
solubility), followed by purging and inert-
ing with nitrogen or carbon dioxide, and
using protective equipment.
Water-lling just below working level may
substitute for inerting.
A container with unknown contents
should be cleaned (see paragraph
above). Do NOT depend on sense of
smell or sight to determine if it is safe to
weld or cut.
Hollow castings or containers must be
vented before welding or cutting. They
can explode.
Explosive atmospheres. NEVER weld
or cut where the air may contain am-
mable dust, gas, or liquid vapors (such
as gasoline).
D. Compressed Gas Equipment
The safe handling of compressed gas
equipment is detailed in numerous
industry publications. The following
general rules cover many of the most
common situations.
1. Pressure Regulators
Regulator relief valve is designed to pro-
tectonlytheregulatorfrom overpressure;
it is not intended to protect any down-
streamequipment. Provide such protec-
tion with one or more relief devices.
Never connect a regulator to a cylinder
containing gas other than that for which
the regulator was designed.
Removefaulty regulator from serviceim-
mediately for repair (rst close cylinder
valve). The following symptoms indicate
a faulty regulator:
Leaks - if gas leaks externally.
Excessive Creep - if delivery pressure
continues to rise with downstream valve
closed.
Faulty Gauge - if gauge pointer does
not move off stop pin when pressurized,
nor returns to stop pin after pressure
release.
Repair. Do NOT attempt repair. Send
faulty regulators for repair to manufac-
turer’s designated repair center, where
specialtechniques and tools areused by
trained personnel.
2. Cylinders
Cylinders must be handled carefully to
prevent leaks and damage to their walls,
valves, or safety devices:
Avoid electrical circuit contact with cylin-
ders including third rails, electrical wires,
or welding circuits. They can produced
short circuit arcs that may lead to a seri-
ous accident. (See 1-3C)
ICCorDOTmarkingmustbeoneachcyl-
inder. It is an assurance of safety when
the cylinder is properly handled.
Identifying gas content. Use only cylin-
ders with name of gas marked on them;
do not rely on color to identify gas con-
tent. Notifysupplierifunmarked. NEVER
DEFACE or altername, number,orother
markings on a cylinder. It is illegal and
hazardous.
Empties: Keep valves closed, replace caps
securely; mark MT; keep them separate
from FULLS, and return promptly.
Prohibited use. Never use a cylinder or its
contents for other than its intended use,
NEVER as a support or roller.
Locate or secure cylinders so they cannot
be knocked over.
Passageways and work areas. Keep cyl-
inders clear of areas where they may be
stuck.
Transporting cylinders. With a crane, use
a secure support such as a platform or
cradle. Do NOT lift cylinders off the ground
bytheir valves or caps, or by chains, slings,
or magnets.
DoNOTexposecylindersto excessive heat,
sparks, slag, and ame, etc. that may cause
rupture. Donotallowcontents to exceed 55
degreesC(130degrees F.) Cool with water
spray where such exposure exists.
Protect cylinders, particularly valves from
bumps, falls, falling objects, and weather.
Replace caps securely when moving cyl-
inders.
Stuck valve. Do NOT use a hammer or
wrenchto open acylinder valve that cannot
be opened by hand. Notify your supplier.
Mixing gases. NEVER try to mix any gases
in a cylinder.
NEVER rell any cylinder.
Cylinder ttings should never be modied
or exchanged.
3. Hose
Prohibited use. Never use hose other
than that designed for the specied gas. A
general hose identication rule is: red for
fuel gas, green for oxygen, and black for
inert gases.
Use ferrules or clamps designed for the
hose (not ordinary wire or other substitute)
as a binding to connect hoses to ttings.
No copper tubing splices. Use only stan-
dard brass ttings to splice hose.
Avoidlongrunstopreventkinks and abuse.
Suspend hose off ground to keep it from
being run over, stepped on, or otherwise
damaged.
Coil excess hose to prevent kinks and
tangles.
Protecthose from damage bysharp edges,
and by sparks, slag, and open ame.
Examine hose regularly for leaks, wear,
andlooseconnections. Immersepressured
hose in water; bubbles indicate leaks
Repair leaky or worn hose by cutting area
out and splicing. Do NOT use tape.
4. Proper Connections
Cleancylinder valve outlet ofimpuritiesthat
may clog orices and damage seats before
connecting regulator. Except for hydrogen,
crack valve momentarily, pointing outlet
away from people and sources of ignition.
Wipe with a clean, lintless cloth.
Match regulator to cylinder. Before con-
necting, check that the regulator label and
cylinder marking agree, and that the
regulatorinlet and cylinder outletmatch.
NEVER Connect a regulator designed
foraparticular gas or gasestoacylinder
containing any other gas.
Tightenconnections. Whenassembling
threadedconnections,clean and smooth
seatswhere necessary. Tighten. Ifcon-
nection leaks, disassemble, clean, and
retighten, using properly tting wrench.
Adapters. UseaCGAadapter(available
fromyoursupplier)between cylinder and
regulator, if one is required. Use two
wrenches to tighten adapter marked
RIGHT and LEFT HAND threads.
Regulator outlet (or hose) connections
may be identied by right hand threads
for oxygen and left hand threads (with
grooved hex on nut or shank) for fuel
gas.
5. Pressurizing Steps:
Drain regulator of residual gas through
suitable vent before opening cylinder
(or manifold valve) by turning adjusting
screw in (clockwise). Draining pre-
vents excessive compression heat at
high pressure seat by allowing seat to
openonpressurization. Leaveadjusting
screw engaged slightly on single-stage
regulators.
Stand to side of regulator while opening
cylinder valve.
Open cylinder valve slowly so that regu-
lator pressure increases slowly. When
gauge is pressurized (gauge reaches
regulator maximum) leave cylinder
valve in following position: for oxygen
and inert gases, open fully to seal stem
against possible leak; for fuel gas, open
to less than one turn to permit quick
emergency shut-off.
Use pressure charts (available from
your supplier) for safe and efficient
recommended pressure settings on
regulators.
Check for leaks on rst pressurization
andregularlythereafter. Brushwithsoap
solution. Bubbles indicate leaks. Clean
off soapy water after test; dried soap is
combustible.
E. User Responsibilities
Follow all Safety Rules.
Remove leaky or defective equipment
from service immediately for repair.
Read and follow user manual instruc-
tions.
F. Leaving Equipment Unat-
tended
Close gas supply at source and drain
gas.
G. Rope Staging-Support
Rope staging-support should not be
used for welding or cutting operation;
rope may burn.
1-3 ARC WELDING
Comply with precautions in 1-1, 1-2,
and this section. Arc Welding, properly
done, is a safe process, but a careless

CobraTig®150 Owner's Manual - Page iii
operator invites trouble. The equipment
carries high currents at signicant volt-
ages. The arc is very bright and hot.
Sparks y, fumes rise, ultraviolet and
infrared energy radiates, weldments are
hot,andcompressedgasesmaybeused.
The wise operator avoids unnecessary
risks and protects himself and others
from accidents.
A. Burn Protection
Comply with precautions in 1-2.
The welding arc is intense and visibly
bright. Its radiation can damage eyes,
penetrate lightweight clothing, reflect
from light-colored surfaces, and burn
the skin and eyes. Skin burns resemble
acute sunburn; those from gas-shielded
arcs are more severe and painful.
DON’T GET BURNED; COMPLY WITH
PRECAUTIONS.
1. Protective Clothing
Wear long-sleeve clothing in addition to
gloves, hat, and shoes. As necessary,
use additional protective clothing such
as leather jacket or sleeves, ameproof
apron, and re-resistant leggings. Avoid
outer garments of untreated cotton.
Bare skin protection. Wear dark, sub-
stantial clothing. Button collar to protect
chest and neck, and button pockets to
prevent entry of sparks.
2. Eye and Head Protection
Protect eyes from exposure to arc. Eyes
maybedamagedbyradiantenergywhen
exposed to the electric arc, even when
not looking in the direction of the arc.
Never look at an electric arc without
protection.
Welding helmet or shield containing a
lter plate shade no. 12 or denser must
be used when welding. Place over face
before striking arc.
Protect filter plate with a clear cover
plate.
Cracked or broken helmet or shield
should NOT be worn; radiation can be
passed through to cause burns.
Cracked, broken, or loose lter plates
must be replaced IMMEDIATELY. Re-
place clear cover plate when broken,
pitted, or spattered.
Flashgoggleswithside shields MUSTbe
worn under the helmet to give some pro-
tection to the eyes should the helmet not
be lowered over the face before an arc
is struck. Looking at an arc momentarily
withunprotectedeyes (particularly a high
intensity gas-shielded arc) can cause a
retinal burn that may leave a permanent
dark area in the eld of vision.
3. Protection of Nearby Personnel
Enclosetheweldingarea. Forproduction
welding,aseparateroomorenclosedbay
is best. In open areas, surround the op-
eration with low-reective, noncombus-
tible screens or panels. Allow for free air
circulation, particularly at oor level.
Viewing the weld. Provide face shields
forallpersons who will be looking directly
at the weld.
Othersworkingin area. See that allpersons
are wearing ash goggles.
Before starting to weld, make sure that
screen aps or bay doors are closed.
B. Toxic Fume Prevention
Comply with precautions in 1-2B.
Generator engine exhaust must be vented
to the outside air. Carbon monoxide can
kill.
C. Fire and Explosion Prevention
Comply with precautions in 1-2C.
Equipment’s rated capacity. Do not over-
load arc welding equipment. It may over-
heat cables and cause a re.
Loose cable connections may overheat or
ash and cause are.
Never strike an arc on a cylinder or other
pressurevessel. Itcreatesabrittleareathat
cancauseaviolentrupture or lead to such a
rupture later under rough handling.
D. Compressed Gas Equipment
Comply with precautions in 1-2D.
E. Shock Prevention
Exposed electrically hot conductors or
other bare metal in the welding circuit, or
in ungrounded, electrically-HOT
equipmentcanfatallyshockapersonwhose
body becomes a conductor. DO NOT
STAND, SIT, LIE, LEAN ON, OR TOUCH a
wet surface when welding without suitable
protection.
To protect against shock:
Keep body and clothing dry. Never work
in damp area without adequate insulation
against electrical shock. Stay on a dry
duckboard, or rubber mat when dampness
or sweat cannot be avoided. Sweat, sea
water, or moisture between body and an
electrically HOT part - or grounded metal
- reduces the body surface electrical resis-
tance, enabling dangerous and possibly
lethal currents to ow through the body.
1. Grounding the Equipment
When installing, connect the frames of
each unit such as welding power source,
control, work table, and water circulator to
the building ground. Conductors must be
adequate to carry ground currents safely.
Equipment made electrically HOT by stray
currents may shock, possibly fatally. Do
NOT GROUND to electrical conduit, or to a
pipe carrying ANY gas or a ammable liquid
such as oil or fuel.
Three-phase connection. Check phase
requirement of equipment before install-
ing. If only three-phase power is available,
connectsingle-phaseequipmenttoonlytwo
wires of the three-phase line. Do NOT con-
nect the equipment ground lead to the third
(live) wire, or the equipment will become
electrically HOT - a dangerous condition
that can shock, possibly fatally.
Beforewelding,checkground for continuity.
Besureconductors are touching bare metal
of equipment frames at connections.
If a line cord with a ground lead is provided
with the equipment for connection to a
switch box, connect the ground lead
to the grounded switch box. If a three-
prong plug is added for connection to a
groundedmating receptacle, the ground
lead must be connected to the ground
prong only. If the line cord comes with a
three-prongplug,connect to a grounded
mating receptacle. Never remove the
ground prong from a plug, or use a plug
with a broken ground prong.
2. Connectors
Fully insulated lock-type connectors
should be used to join welding cable
lengths.
3. Cables
Frequently inspect cables for wear,
cracks, and damage. IMMEDIATELY
REPLACE those with excessively worn
or damaged insulation to avoid possibly
lethal shock from bared cable. Cables
with damaged areas may be taped to
give resistance equivalent to original
cable.
Keep cable dry, free of oil and grease,
and protected from hot metal and
sparks.
4. Terminals and Other Exposed
Parts
Terminals and other exposed parts of
electrical units should have insulating
covers secured before operation.
5. Electrode Wire
Electrode wire becomes electrically
HOT when the power switch of gas
metal-arc welding equipment is ON and
welding gun trigger is pressed. Keep
hands and body clear of wire and other
HOT parts.
6. Safety Devices
Safety devices such as interlocks and
circuit breakers should not be discon-
nected or shunted out.
Beforeinstallation, inspection, or service
of equipment, shut OFF all power, and
remove line fuses (or lock or red-tag
switches) to prevent accidental turning
ONof power.Disconnect all cablesfrom
welding power source, and pull all 115
volts line-cord plugs.
Do not open power circuit or change
polarity while welding. If, in an emer-
gency, it must be disconnected, guard
against shock burns or ash from switch
arcing.
Leavingequipment unattended. Always
shut OFF, and disconnect all power to
equipment.
Power disconnect switch must be avail-
able near the welding power source.

CobraTig®150 Owner's Manual - Page 1
INTRODUCTION
The portable, lightweight CobraTig150 SM with SmartArc®
provides the automatic control you need to deliver repeatability,
verication and traceability in high-integrity orbital and manual
welding.
SmartArc software develops a near ideal weld procedure
through the use of our Automatic Procedure Generator. Just
enter the tube outside diameter and wall thickness... The rest is
automatic.
This version of CobraTig Software and Hardware has the latest
in Micro-Tig Technology. The system is now capable of going
down to 0.1 amps. High Voltage Pulse automatic arc starting
from 0.5 to 25 amps.
Make the most of your offsite and onsite welding operations.
With the CobraTig 150 SM, you’ll weld circles around the
competition.

CobraTig®150 Owner's Manual - Page 2
Section 1 Technical Information
Line Power: 100VAC 50/60 Hz Single Phase, 15A
(+/- 10%) 120VAC 50/60 Hz Single Phase, 15A
208-220/230-240VAC 50/60 Hz Single or Three Phase,30A
Output Current: 0.1~150A (+/- 1%), Constant or Pulsed
Minimum Arc Starting: 0.5 to 25 Amps
Pulse Rate: 0.01 to 2.25 Seconds Per Pulse
Arc Voltage: 65VDC Open Circuit, up to 26 welding VDC
Loop Response: 1.5 KHz
Current Regulator Freq: 30 KHz
Motor Control: 24VDC, 2A min., DC Tachometer Feedback.
Memory Storage: 25 Weld Procedures
Section 2 Mechanical Information
Weight: 42 lbs / 19.1 Kg
Height: 14 in. / 35.6 cm
Width: 8.5 in. / 21.6 cm
Length: 19 in. / 48.3 cm
Section 3 Weldhead and Torches
For robust solutions for orbital weld applications, the CopperHeads®are ideal
cost savers for sanitary and high-pressure tube systems.
The CopperHead series are our most cost effective and rugged in-place
orbital weldheads offered in three models. The CopperHead models 5001
(1/8 - 1 inch OD), 5002 (1/4 - 2 inch OD) and 5003 (1/2 - 3 inch OD) each
offer versatility and high-output production rates.
The water-cooled, narrow prole CopperHeads are lightweight and easy to
handle for those awkward welds with limited access.
All MK weldheads can be utilized as bench mounted or remotely controlled
units.
The models and the capacities are as follows:
MODEL CAPACITY (Max. OD)
5001 1/8” - 1”
5002 1/4” - 2”
5003 1/2” - 3”
5006 2" OD - 6" OD Tube
With a simple power connector pigtail (P/N 005-
0619), all previously sold MK Orbital weldheads will
adapt to the CobraTig 150 SM. You must change the previous electrode and
ground cable connectors from the push-in type to a twist-lock type.
The order numbers for the twist-lock type are: P/N 153-0755 Electrode (male
connector to exchange for the black connector) and P/N 153-0813 Ground
(female connector to exchange for the green connector).
For MicroTig welding operations, the MicroTigAccessory Kit (P/N 005-0670)
is also available. This contains all the necessary items needed when using
the CobraTig150 SM unit in the WELD MANUAL mode.
Precision MicroTig Technology is a standard feature of the CobraTig150 SM.
The ideal precision manual welder produces reliable, smooth arc starts at 0.5
amps and is perfect for welding precision thin wall exotic materials such as
titanium and stainless steel or ne wire sizes.

CobraTig®150 Owner's Manual - Page 3
Section 4 Connections
Input Power
The CobraTig 150 SM can operate on any of four different input power
values: 100VAC, 120VAC, 208-220/230-240VAC Single Phase and, 208-
220/230-240VAC Three Phase. Attached to the unit is a 12ft power cable
that comes wired from the factory ready for 120VAC. Even though the
installed plug is only three prongs, there are four wires in the cable, ready for
three phase power.
DANGER
DISCONNECT ALL POWER TO THE UNIT PRIOR TO CHANGING THE POWER
TAPS. FAILURE TO DO THIS WILL RESULT IN SERIOUS BODILY HARM AND
EXTENSIVE EQUIPMENT DAMAGE.
To change the input power type, three changes have to be made to the
CobraTig 150 SM unit: rst change the voltage jumper, then the voltage
selector cable and the plug on the end of the cable. You will need a 1/4”
nutdriver wrench and a #2 Phillips head screwdriver.
Using the nutdriver, remove all the 1/4” hex head screws from the cover of
the unit, then lift the cover off. Locate TB1 on the lower-right-rear side of the
unit, from the front. Using the Phillips head screwdriver to change the taps,
follow the directions below:
Congure Voltage Selector Jumper at TB1 terminals 1-3, for the input
voltage, 100V/120V or 208V-220/230-240VAC. Remove and ip over to
change (see Jumper Conguration image).
Move “Voltage Selector Cable” to the corresponding input voltage terminal of
TB1 for 100V, 120V, 208V-220/230-240V.
After the input voltage taps have been congured, then change the plug on
the end of the power cable to match.
SmartArc®Software Update
When viewing the MAIN MENU of the CobraTig 150 SM, the currently loaded
software version will appear across the middle of the screen. Once the
software update is properly performed, this version number will show the
newly loaded version number.
Jumper Conguration
TB1 Congured
for 100/120VAC
TB1 Congured for
200-220/230-240VAC
1 2 3 4 5 6 7 8
100V 120V 208V/ 230V/
220V 240V
100/120V
1 2 3 4 5 6 7 8
208/230V
100V 120V 208V/ 230V/
220V 240V

CobraTig®150 Owner's Manual - Page 4
In order to update the rmware version in the CobraTig® 150, the following
items are needed:
• CobraTig 150.
• PC/Laptop running Windows (Mac not supported).
• Null Modem Cable (Female DB9 to Female DB9 ) and/or Serial to USB
Adapter Cable
• MK Edit/SmartArc Weld Program Editor and latest CobraTig Firmware,
downloaded and saved to the Desktop.
1. Connect the Null Modem to CobraTig rear panel and to PC/laptop serial
port. A USB to Serial PortAdapter Cable is required if a serial port does
not exist on the PC/laptop.
2. Once cabling is connected, on the CobraTig front panel, press and
hold the F10 button (lower-right hand button) while powering on the
CobraTig.
The screen will display “READY TO RECEIVE…”, as shown. If it does
not, turn CobraTig off, wait 15 seconds and try again.
3. Run MK Edit. On the Tool Bar, select Send then select Send Firmware
Upgrade to CobraTig (Ctrl + U).
Choose the correct COM port, in accordance with your PC/laptop, from
the CobraTig Communication dialog box. Press Start.
If the program returns with a COM Error Dialog Box indicating an invalid
storage control block address, choose the other COM port from the
CobraTig Communication Dialog box.*
From the Select Welder Upgrade dialog box, nd the .150 les saved
on the Desktop. Choose and highlight (or double-click) the le which
begins upload to CobraTig.
4. Once the rmware upgrading starts, the screen on the CobraTig will
show the status of the downloading. The bottom of this screen will
count upwards the number of ‘blocks’ being received from MK Edit.
Simultaneously, the CobraTig Communication Dialog box will show a
bar graph, moving from left to right, as the rmware is being sent to the
CobraTig.
5. Once the rmware has been successfully transmitted, restart the
CobraTig (turn off, wait 15 seconds, then turn on) and disconnect Null

CobraTig®150 Owner's Manual - Page 5
Modem serial cable. View the CobraTig 150 MAIN MENU and inspect
for the new rmware version number.
6. Installation Complete
Section 5 OPERATION
To operate the CobraTig 150 SM portable orbital welding unit, plug in any
standard MK Orbital weldhead to the rear panel, and perform the basic
setup procedures associated with collets, tungsten, and concentricity. Plug
the CobraTig 150 SM into any 120VAC electrical outlet (independent and
isolated circuits will produce the best results), connect the quick disconnect
gas tting into the unit, and the other end to any argon owmeter.
Power the unit on by rocking the ON/OFF switch to the ON position (located
on the rear panel - see below). The unit will remember the last screen that
was on when it was powered off. To start from the beginning, it is best to
calibrate the weldhead prior to starting. Once the weldhead is calibrated,
press any button that will return the screen to the MAIN MENU.
From this point use the AUTO PROG button to start designing the weld
procedure, enter the appropriate variables for the material to be welded,
prepare and align material to be welded, check for proper purge gas ow...
Press START.
The CobraTig 150 SM unit will automatically prepurge the gas ow, initiate
the welding arc, perform any tacks if so desired, complete the weld in one or
multiple revolutions depending on procedure design and return the rotor to
home position while the postpurge gas is owing. Weld complete.
Weldhead Connector
Amphenol
Connector
Electrode
Ground
Weldhead Gas
ON/OFF
RS232
Input Gas
Input Power
Cable
Weldhead
Connections

CobraTig®150 Owner's Manual - Page 6
RS-232 Data Connector
The CobraTig uses a DB-9 connector to communicate with an External PC.
The wiring for this plug is “cable/null” modem wiring (female connector both
ends).
Section 6 Main Menu
This is the starting menu for the CobraTig 150 SM orbital welder. It is from
this menu that all the other menu displays and screens are accessible. From
each menu display, there is a one-step button back to this menu.
This is not to say that every time this unit is turned on that it will start at this
screen. The operating program is such that it will remember the last screen
when the unit is turned off. When the unit is turned on again, it will start with
the last screen displayed.
Help
Press this button to read a brief description of the MAIN MENU button
descriptions and functions.
Section 7 Weld Manual
From the MAIN MENU screen, the WELD MANUAL button must be pressed
in order to access the WELD MANUAL screen.
User Interface Programming Sequence
• From the Main Menu.
• Press F2 Weld Manual, permits manual welding.
• Press F7 and enter Pedal On, permits use of foot control for weld
current Upslope and Final slope control and continuous welding.
• Press F7 and enter Pedal Off, permits use of ON/OFF switch with
programmable weld current upslope and nal slope times from
0.00~1.0 seconds each.
• Press F4 or F9 and scroll to Curr. H. (A), high weld current in amps.
Note: The Current High Amps establishes the maximum output in amps
that may be obtained.
• Press F5 or F10 and enter High current value from 0.2~150 amps.

CobraTig®150 Owner's Manual - Page 7
• Press F4 or F9 and scroll to Curr. L. (A), low weld current in amps.
• Press F5 or F10 and enter Low current value from 0.2~150 amps.
• Press F4 or F9 and scroll to Pulse H. (S), high weld current pulse
time.
• Press F5 or F10 and enter High weld current pulse time from
0.00~0.99 seconds.
• Press F4 or F9 and scroll to Pulse L. (S), low weld current pulse
time.
• Press F5 or F10 and enter Low weld current pulse time from
0.00~0.99 seconds.
• Press F4 or F9 and scroll to Pre-Gas (S), pre-purge gas time.
• Press F5 or F10 and enter pre-purge gas time from 0.0~9.9 seconds.
• Press F4 or F9 and scroll to Post-Gas (S), post-purge gas time.
• Press F5 or F10 and enter post-purge gas time from 0.0~9.9
seconds.
• Press F4 or F9 and scroll to Strike (A), arc strike weld current.
• Press F5 or F10 and enter arc strike weld current from 0.1~25.0
amps.
• Press Foot Control to maximum and hold for duration of weld
• Press F6 Print Weld wave form graphics from integral printer
WELD MANUAL SCREEN DISPLAY
• F1, Start/Stop, used for manual Start/Stop operations without a foot
control.
• F2, Main Menu, returns to the Main Menu display.
• F3, Weld Orbital, returns to the Weld Orbital display.
• F4, Scroll UP, scrolls the highlighted eld from one demand
parameter to the next demand parameter.
• F5, Adjust Up, increases the numerical value of the demand
parameter selected. As this button is pressed for each parameter a
vertical bar graph displays the increasing value, both numerically and
graphically from the bar graph. For most parameters, a maximum
value is obtained once the vertical bar graph has reached the top of
the scale. Also, there is a change in the sound once the top of the
scale has been reached. The sound changes from a single beep to a
triple beep.
• F6, Print Weld, Data-Monitoring of manual weld produces a graphical
real time wave form of welding amps and arc volts.
• F7, Pedal On, selects the variable remote foot control for operation.
• F7, Pedal Off, selects the On/Off switch control and permits additional
programming of weld current Upslope time in seconds and Final
Slope weld current time in seconds.
• F8, Blank, no function control.
• F9, Scroll Down, scrolls the highlighted eld from one demand
parameter to the next demand parameter.
• F10, Adjust Down, decreases the numerical value of the demand
parameter selected. As this button is pressed for each parameter a
vertical bar graph displays the decreasing value, both numerically
and graphically from the bar graph. For most parameters, a minimum
value is obtained once the vertical bar graph has reached the bottom

CobraTig®150 Owner's Manual - Page 8
of the scale. Also, there is a change in the sound once the bottom of
the scale has been reached. The sound changes from a single beep
to a triple beep.
Section 8 Weld Orbital
From the MAIN MENU screen press this button to select orbital welding.
Once at the WELD ORBITAL screen, use the RECALL PROGRAM button
at the bottom of the screen to select from the library of customer designed
and saved procedures, or return to the MAIN MENU and use the APG (Auto
Procedure Generation) function in order to design a new weld procedure.
Use the SCROLL UP, SCROLL DOWN, ADJUST UP, and ADJUST DOWN
buttons to select and modify specic weld procedure parameters. Then
when all variables are set, press the START/STOP button to initiate the
welding process.
Once at the WELD ORBITAL screen, the last orbital weld procedure is
displayed from memory. This is the default procedure and ready to weld. If a
different weld procedure is desired, it can either be recalled from memory or,
developed using the Auto Program Generator (APG).
Start/Stop
Pressing this button will start the prepurge gas owing and start the
welding procedure.
Main Menu
Press this button to return to the MAIN MENU.
Print Weld
Press the PRINT WELD button to obtain a printout of the last weld
procedure parameters and the wave form strip chart of the completed
weld.
This will give a weld procedure printout, rst showing the description of
the procedure, followed by the all the welding parameters, then by Limit
and Deviation parameters, then by the actual strip chart of the weld
current, arc voltage and motor speed.
Scroll Up
Press this button in order to scroll and select the highlighted eld from
one DEMAND parameter up to the next.
Adjust Up
After the SCROLL UP or SCROLL DOWN buttons have been used
to select a parameter to be modied, press the ADJUST UP button to
increase the numerical value of that parameter.
As this button is pressed for each parameter a vertical bar graph shows
the increasing value, both numerically and in height of the bar graph.
For most parameters, a maximum value is obtained once the vertical bar
graph has reached the top of the scale. There is also a change in the
sound once the maximum has been reached, from a single ‘beep’ to a
triple ‘beep’.

CobraTig®150 Owner's Manual - Page 9
Section 9 Recall Program
Press the RECALL PROGRAM in order to access the library of operator
saved weld procedures.
NOTE: If the currently used procedure is not saved, a warning screen
of text will prompt for a ‘YES’ or ‘NO’ answer: this is the OVERWRITE
screen. Anytime there is a potential change to the existing weld
procedure, this screen will appear.
If ‘NO’ is pressed, the screen will return to the WELD ORBITAL screen. If
‘YES’ is pressed, the screen will change to RECALL USER MEMORY.
Help
Press this button to read a brief description of the RECALL menu button
descriptions and functions.
Main Menu
Press this button to return to the MAIN MENU.
Weld Orbital
Press this button to return to the WELD ORBITAL screen.
Scroll Left
Each time this button is pressed, the locations of where each weld
procedure is saved will move three number locations to the left.
Locations
The bottom three buttons on this screen indicate the number of the
location where weld procedures are saved. Using the SCROLL LEFT
and SCROLL RIGHT button, will move the locations accordingly to show
the status of each location.
Those locations with the word EMPTY above the number, indicate that
there is no weld procedure saved in that location.
Scroll Right
Each time this button is pressed, the locations of where each weld
procedure is saved will move three number locations to the right.
Those locations with the word EMPTY above the number, indicate that
there is no weld procedure saved in that location.

CobraTig®150 Owner's Manual - Page 10
If the current weld program is a temporary, unsaved/modied program, the
RECALL screen will be blank. This indicates that the current weld program
has not been saved to any location. However, if the current weld program
is from one of the saved locations, this screen will display the location it is
presently saved at.
Press any button that does not contain the word EMPTY. Press WELD
ORBITAL to return to that screen to begin welding with the saved
procedure.
Section 10 Save Program
Once a weld procedure has been developed, it is generally a good idea to
save it for use at a later date. In order to do this, simply press the SAVE
PROGRAM button. This will change to the SAVE USER MEMORY screen.
Help
Press this button to read a brief description of the SAVE menu button
descriptions and functions.
Main Menu
Press this button to change to the MAIN MENU.
Weld Orbital
Press this button to change to the WELD ORBITAL screen.
Communication Menu
Press this button to change to the COMMUNICATION MENU.
Scroll Left
Each time this button is pressed, the locations of where each weld
procedure is saved or can be saved to, will move three numbers to the
left.
Those locations with the word EMPTY above the number, indicate that
there is no weld procedure saved in that location.
Locations
When a location button is pressed, and if that location is already
occupied with a weld procedure, another screen will appear with an
OVERWRITE VERIFY message.

CobraTig®150 Owner's Manual - Page 11
If the current procedure is to be saved at this location, press “YES”. If
this location is to be emptied, and the saved weld procedure erased,
press “EMPTY ONLY”. If nothing is to be done with this location, and
you need to return to the SAVE PROGRAM MENU, press “NO”.
Scroll Right
Each time this button is pressed, the locations of where each weld
procedure is saved or can be saved to, will move three numbers to the
right.
Those locations with the word EMPTY above the number, indicate that
there is no weld procedure saved in that location.
Weld Mode
Pressing this button will toggle the high voltage arc starter from the
prompt READY TO WELD (high voltage enabled) to READY TO TEST
(high voltage disabled). This toggle is visible at the bottom of the WELD
ORBITAL screen.
Scroll Down
Press this button in order to scroll the highlighted eld from one
DEMAND parameter down to the next. Adjustment of each parameter is
performed using the ADJUST UP or ADJUST DOWN buttons.
Adjust Down
After the SCROLL UP or SCROLL DOWN buttons have been used to
select a parameter to be modied, press the ADJUST DOWN button to
decrease the numerical value of that parameter.
As this button is pressed for each parameter a vertical bar graph shows
the decreasing value, both numerically and in height of the bar graph.
For most parameters, a minimum value is obtained once the vertical bar
graph has reached the bottom of the scale. There is also a change in
the sound once the minimum has been reached, from a single ‘beep’ to a
triple ‘beep’.
Section 11 Auto Program Generator
From the main menu screen press Auto Prog. The ease of using the
CobraTig 150 SM comes primarily from this feature. By simply inputting

CobraTig®150 Owner's Manual - Page 12
some basic tube or pipe variables, the CobraTig 150 SM digital controller can
generate and produce a near ideal weld procedure.
The following menu will guide the operator through basic elds of information
entry. Beginning with selections for tube or pipe and diameter and wall
thickness. Additional information can be designed into the procedure that
include different pulse types, up to 5.0 seconds motor delay time, multiple
revolutions, and programming of up to 7 opposing tacks.
Help
Press this button to read a brief description of the APG button
descriptions and functions.
Ignore Entries
Pressing this button at any time during the design of a weld procedure,
will automatically return the program to the MAIN MENU and lose all
entered information.
Accept Entries
Once the rst three variables are entered into the APG screen this button
may be pressed, thus bypassing any additional features and changing
directly to the WELD ORBITAL screen.
Previous Entry
Press this button to return to the previous eld in order to change the
entered value.
Next Entry
Press this button to jump to the next eld in order to change the entered
value or add a new value.
Gas On/Gas Off
This button is used to manually toggle the gas ow either “ON” OR
“OFF”. This button is used to indicated the status of the gas ow.
When the button reads “GAS ON”, the gas solenoid valve is open and
the gas owing.
When the button reads “GAS OFF”, the gas solenoid valve is closed and
the gas is not owing.
Section 12 Print Menu
At the PRINT MENU, many different aspects of the CobraTig 150 SM can be
printed or modied. Not only can various printouts of weld procedures, list of
procedures, and calibration reports be made but the printer conguration can
be modied to print on command or automatically.
Help
Press this button to read a brief description of the PRINT MENU button
descriptions and functions.
Main Menu
Press this button to return to the MAIN MENU.

CobraTig®150 Owner's Manual - Page 13
Print Graph
This function works with the Printer After Welds function. Pressing
this button toggles the command from YES (prints weld procedure
parameters plus entire weld graph), to NO (prints weld procedure
parameters only).
Paper Feed
Press and hold this button down in order to feed paper through the
printer driver mechanism. This is especially useful after loading a new
roll of paper.
Printer Reset
Should the printer run out of paper either during a PRINT WELD or while
feeding, the PRINTER STATUS eld will read as follows, “ERROR, OUT
OF PAPER".
Once a new roll of paper has been loaded and fed through using the
PRINTER FEED button, press the PRINTER RESET button once. This
should return the PRINTER STATUS eld to read, “OK”.
To load a new roll of paper, slide printer tray straight out until it
stops. Disengage the Printer Drive Mechanism by lifting up the
Drive Latch Arms on either side of the printer. Unroll approximately
4 to 6 inches of paper from the roll and feed through the slot,
pushing the paper through until it emerges from the front panel of
the printer tray.
Pull up any extra slack in the paper. Lower the Drive Latch Arms to
secure the Printer Drive Mechanism.
Press the PRINTER FEED button to align paper in Drive, then press
the PRINTER RESET button.
Active Program
Press this button in order to print the current weld procedure that is
loaded on the memory of the unit.
Last Orbital Weld
Press this button to obtain a printout of the last completed orbital weld.
This will give the same results as the PRINT WELD button on the WELD
ORBITAL screen.
Feed Paper Through Slot
Driver Latch
Arm
Driver Latch
Arm