Arcoweld ArcoTiG HF 315 AC/DC User manual

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II
CONGRATULATIONS!
THANK YOU FOR YOUR PURCHASE OF THIS
QUALITY ARCOWELD PRODUCT!
WELCOME TO THE ARCOWELD TEAM!
We look forward to supporting you with dependable service and
our extensive range of first-class products.
Our range can be viewed at -https://arcoweld.com.au/
For support please contact your Authorised distributor or Arcoweld directly
T: + 61 8 9248 3188
F: + 61 8 9248 3166
93 Mulgul Road, MALAGA, WA6090
PO Box 3087, MALAGA DC, WA 6945
Email- [email protected]m.au
Website- www.alloysteel.net

CONTENT
III
CONTENTS
1 SAFETY----------------------------------------------------------------------------------------------------------------------- 1
1.1 SIGNAL EXPLANATION ----------------------------------------------------------------------------------------------------- 1
1.2 ARC WELDING DAMAGE -------------------------------------------------------------------------------------------------- 1
1.3 THE KNOWLEDGE OF ELECTRIC AND MAGNETIC FIELDS ------------------------------------------------------------------ 5
2 SUMMARY ------------------------------------------------------------------------------------------------------------------ 4
2.1 BRIEF INTRODUCTION ---------------------------------------------------------------------------------------------------- 9
2.2 MODULE EXPLANATION ------------------------------------------------------------------------------------------------- 11
2.3 WORKING PRINCIPLE ---------------------------------------------------------------------------------------------------- 11
2.4 VOLT-AMPERAGE CHARACTERISTIC ------------------------------------------------------------------------------------- 12
3 INSTALLATION AND ADJUSTMENT ----------------------------------------------------------------------------------- 13
3.1 PARAMETERS------------------------------------------------------------------------------------------------------------- 13
3.2 DUTY CYCLE &OVER HEAT ---------------------------------------------------------------------------------------------- 14
3.3 MOVEMENT AND PLACEMENT ------------------------------------------------------------------------------------------ 14
3.4 POWER SUPPLY INPUT CONNECTION ------------------------------------------------------------------------------------ 15
3.5 POLARITY CONNECTION（MMA）----------------------------------------------------------------------------------- 15
3.6 ASSEMBLING THE EQUIPMENT (TIG) ----------------------------------------------------------------------------------- 15
4 OPERATION --------------------------------------------------------------------------------------------------------------- 16
4.1LAYOUT FOR THE PANEL-------------------------------------------------------------------------------------------------- 16
4.2 CONTROL PANEL --------------------------------------------------------------------------------------------------------- 20
4.3 REMOTE CONTROL------------------------------------------------------------------------------------------------------- 26
4.3.1 Pedal switch control------------------------------------------------------------------------------------------- 26
4.3.2 Torch switch control current ------------------------------------------------------------------------------ 27
4.4 ARGON ARC WELDING OPERATION------------------------------------------------------------------------------------- 27
4.4.1 TIG welding （ 4T operation ） -------------------------------------------------------------------------- 27
4.4.2 TIG welding (2T operation) ---------------------------------------------------------------------------------- 29
4.5 WELDING PARAMETERS ------------------------------------------------------------------------------------------------- 31
4.5.1 Joint forms in TIG/MMA-------------------------------------------------------------------------------------- 31
4.5.2 The explanation of welding quality ------------------------------------------------------------------------ 31
4.5.3 TIG Parameters Matching ----------------------------------------------------------------------------------- 31
4.6 OPERATION ENVIRONMENT --------------------------------------------------------------------------------------------- 34
4.7 OPERATION NOTICES ---------------------------------------------------------------------------------------------------- 34
5 MAINTENANCE & TROUBLESHOOTING ----------------------------------------------------------------------------- 36
5.1 MAINTENANCE ---------------------------------------------------------------------------------------------------------- 36
5.2 TROUBLESHOOTING ----------------------------------------------------------------------------------------------------- 37
5.3 ELECTRICAL PRINCIPLE DRAWING---------------------------------------------------------------------------------------- 40
5.4ACCESSORY KITS LIST----------------------------------------------------------------------------------------------------- 33

4
1 SAFETY
1.1 Signal Explanation
The above signals mean warning! Notice! Running parts and electric shocks can injure or kill.
It is a safe operation after taking several necessary protection measures.
1.2 Arc Welding Damage
The following signals and word explanations relay dangers present during the welding operation.
Please be aware and cautious.
Only persons who are trained professionally can install, debug, operate, maintain and repair the
equipment.
During the operation, only required persons shall be present within the welding area. Nil children
should be present.
After shutting off the machine power, please maintain and examine the equipment according to
section 5 because of the DC voltage existing in the electrolytic capacitors.
ELECTRIC SHOCK CAN KILL.
Never touch electrical parts.
Wear dry, hole-free gloves and clothes to insulate yourself.
Insulate yourself from work and ground using dry insulation. Make certain the insulation is large
enough to cover your full area of physical contact with work and ground.
Take carefully when using the equipment in confined spaces, at heights and in wet environments.
Always shut down the machine power before installation and adjustment.
Ensure to install the equipment correctly and ground the work or metal to be welded to a good
electrical (earth) ground according to the operation manual.
The electrode and work (or ground) circuits are electrically “hot” when the welder is on. Do not touch
these “hot” parts with your bare skin or wet clothing. Wear dry, hole-free gloves to insulate hands.
In semiautomatic or automatic wire welding, the electrode, electrode reel, welding head, nozzle or

SUMMARY
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semiautomatic welding torch are also electrically “hot”.
Always be sure the work cable makes a good electrical connection with the metal being welded. The
connection should be as close as possible to the area being welded.
Maintain the electrode holder, work clamp, welding cable and welding machine in good, safe operating
condition. Replace damaged insulation.
Never dip the electrode in water for cooling.
Never simultaneously touch electrically “hot” parts of electrode holders connected to two welders
because voltage between the two can be the total of the open circuit voltage of both welders.
When working above floor level, use a safety belt to protect yourself from a fall should you get a
shock.
FUMES AND GASES CAN BE DANGEROUS.
Welding may produce fumes and gases hazardous to health. Avoid breathing these fumes and gases.
When welding, keep your head out of the fume. Use enough ventilation and/or exhaust at the arc to
keep fumes and gases away from the breathing zone. When welding with electrodes which require
special ventilation such as stainless or hard facing or on lead or cadmium plated steel and other metals
or coatings which produce highly toxic fumes, keep exposure as low as possible and below Threshold
Limit Values using local exhaust or mechanical ventilation. In confined spaces or in some circumstances,
outdoors, a respirator may be required. Additional precautions are also required when welding on
galvanized steel.
Do not weld in locations near chlorinated hydrocarbon vapors coming from degreasing, cleaning or
spraying operations. The heat and rays of the arc can react with solvent vapors to form phosgene, a
highly toxic gas, and other irritating products.
Shielding gases used for arc welding can displace air and cause injury or death. Always use enough
ventilation, especially in confined areas, to ensure breathing air is safe.
Read and understand the manufacturer’s instructions for this equipment and the consumables to be
used, including the material safety data sheet and follow your employer’s safety practices.
ARC RAYS CAN BURN.
Use a shield with the proper filter and cover plates to protect your eyes from sparks and the rays of

SUMMARY
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the arc when welding or observing open arc welding.
Use suitable clothing made from durable flame-resistant material to protect your skin and that of your
helpers from the arc rays.
Protect other nearby personnel with suitable, non-flammable screening and /or warn them not to
watch the arc nor expose themselves to the arc rays or to hot spatter or metal.

SUMMARY
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SELF-PROTECTION
Keep all equipment safety guards, covers and devices in position and in good repair. Keep hands, hair,
clothing and tools away from V-belts, gears, fans and all other moving parts when starting, operating or
repairing equipment.
Do not put your hands near the engine fan. Do not attempt to override the governor or idler by
pushing on the throttle control rods while the engine is running.
DO NOT adds fuel near an open flame welding arc or when the engine is
running. Stop the engine and allow it to cool before refueling to prevent spilled fuel from vaporizing on
contact with hot engine parts and igniting. Do not spill fuel when filling tank. If fuel is spilled, wipe it up
and do not start engine until fumes have been eliminated.
WELDING SPARKS can cause fire or explosion.
Remove fire hazards from the welding area. If this is not possible, cover them to prevent the welding
sparks from starting a fire. Remember that welding sparks and hot materials from welding can easily go
through small cracks and openings to adjacent areas. Avoid welding near hydraulic lines. Have a fire
extinguisher readily available.
Where compressed gases are to be used at the job site, special precautions should be used to prevent
hazardous situation.
When not welding, make certain no part of the electrode circuit is touching the work or ground.
Accidental contact can cause overheating and create a fire hazard.
Do not heat, cut or weld tanks, drums or containers until the proper steps have been taken to ensure
that such procedures will not cause flammable or toxic vapors from substances inside. They can cause
an explosion even though they have been “cleaned”.
Vent hollow castings or containers before heating, cutting or welding. They may explode.
Sparks and spatter are thrown from the welding arc. Wear oil free protective garments such as leather
gloves, heavy shirt, cuff less trousers, high shoes and a cap over your hair. Wear ear plugs when welding
out of position or in confined places. Always wear safety glasses with side shields when in a welding

SUMMARY
8
area.
Connect the work cable to the work as close to the welding area as practical. Work cables connected
to the building framework or other locations away from the welding area increase the possibility of the
welding current passing through lifting chains, crane cables or other alternate circuits. This can create
fire hazards or overheat lifting chains or cables until they fail.
Rotating parts may be dangerous.
Use only compressed gas cylinders containing the correct shielding gas for the process used and
properly operating regulators designed for the gas and pressure used. All hoses, fittings, etc. should be
suitable for the application and maintained in good condition.
Always keep cylinders in an upright position securely chained to an undercarriage or fixed support.
Cylinders should be located:
-Away from areas where they may be struck or subjected to physical damage.
-A safe distance from arc welding or cutting operations and any other source of heat, sparks, or
flame.
Never allow the electrode, electrode holder or any other electrically “hot” parts to touch a cylinder.
Keep your head and face away from the cylinder valve outlet when opening the cylinder valve.
Valve protection caps should always be in place and hand tight except when the cylinder is in use or
connected for use.
1.3 The knowledge of Electric and Magnetic Fields
Electric current flowing through any conductor causes localized Electric and Magnetic Fields (EMF).
The discuss on the effect of EMF is ongoing all the world. Up to now, no material evidences show that
EMF may have effects on health. However, the research on damage of EMF is still ongoing. Before any
conclusion, we should minimize exposure to EMF as few as possible.
In order to minimize EMF, we should use the following procedures:
Route the electrode and work cables together – Secure them with tape when possible.
All cables should be put away and far from the operator.
Never coil the power cable around your body.
Make sure welding machine and power cable to be far away from the operator as far as possible

SUMMARY
9
according to the actual circumstance.
Connect the work cable to the workpiece as close as possible to the area being welded.
Persons with heart-pacemaker should be away from the welding area.
2 SUMMARY
2.1 Brief Introduction
ArcoTig 250W/315W AC/DC welding machine adopts the latest pulse width modulation (PWM)
technology and insulated gate bipolar transistor (IGBT) power module, which can replace large
transformer type welders. Inverters are portable, small in size, light weight, with low power low
consumption.
The parameters of ARCOTIG HF 315 AC/DC on the front panel all can be adjusted continuously and
steplessly, such as start current, crater arc current, welding current, base current, duty ratio, upslope
time, downslope time, pre-gas, post-gas, pulse frequency, AC frequency, balance, hot start, arc force and
arc length etc. When welding, it uses high frequency and high voltage for arc ignition consistency.
ARCOTIG 3 CHARACTERISTICS：
MCU control system, responds immediately to any changes.
High frequency and high voltage for arc igniting to ensure the success ratio of igniting arc, the
reverse polarity ignition ensures good ignition behavior in TIG-AC welding.
Avoid AC arc-break with special means, even if arc-break occurs the HF will keep the arc stable.
Pedal control the welding current.
TIG/DC operation,If the tungesten electrode touches the workpiece when welding, the current will
drop to short-circuit current to protect tungsten.
Intelligent protection: over-voltage, over-current, over-heat, when the problems listed before
occurred, the alarm lamp on the front panel will be on and the output current will be cut off. It can
self-protect and prolong the using life.
Double purposes: AC inverter TIG/MMA and DC inverter TIG/MMA, Excellent performance on
Al-alloy、carbon steel、stainless steel、titanium.
According to choosing the front panel functions, the following six processes are available-

SUMMARY
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DC MMA
DC TIG
DC Pulse TIG
AC MMA
AC TIG
AC Pulse TIG
1.For DC MMA, polarity connection can be chosen according to different electrodes，please refer to
3.5；
2.For AC MMA, magnetic flow caused by invariable DC polarity can be avoided；
3. For DC TIG, DCEP is used normally (workpiece connected to positive polarity, while torch
connected to negative polarity). This connection has many characters, such as stable welding arc,
low tungsten pole loss, more welding current, narrow and deep weld;
4. For AC TIG (rectangle wave), arc is more stable than Sine AC TIG. At the same time, you can not
only obtain the max penetration and the min tungsten pole loss, but also obtain better clearance
effect.
5. DC Pulsed TIG has the following characteristics: 1) Pulse heating. Metal in Molten pool has short
time in high temperature status and freezes quickly, which can reduce the possibility of hot cracking.
2) The workpiece stays cooler. Arc energy is focused. Suitable for thin sheet and super thin sheet
welding. 3) Exactly control heat input and the size of the molten pool. The depth of penetration is
consistent. Suitable for welding by one side and forming by two sides and all position welding for
pipe. 4) High frequency arc can eliminate blowholes and improve the mechanical performance of
the joint. 5) High frequency arc is suitable for high welding speed, improving productivity.
ArcoTig 250W/315W AC/DC series welding machines are suitable for all positions welding for
various plates made of stainless steel, carbon steel, alloyed steel, titanium, aluminum, magnesium,
cuprum, etc, which is also applied to pipe installment, mould mend, petrochemical, architecture
decoration, car repair, bicycle, handicraft and common manufacture.
MMA——Manual Metal Arc welding;

SUMMARY
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PWM——Pulse-Width Modulation;
IGBT——Insulation Gate Bipolar Transistor
TIG——Tungsten Insert Gas welding
2.2 Module Explanation
The module explanation of arc welding machine must accord with the correlative prescripts of
National Standard GB10249. It is explained as the following (take ARCOTIG HF 315 AC/DC as an
example).
MAGIC AC TIG-250W
MAX CURRENT 250A
AC/DC
Soft-switching technology
Multiple Waveform Control
TIG
2.3 Working Principle
The working principle of ArcoTig 250W/315W AC/DC welding machines is shown as the following
figure. 3-phase 380V work frequency AC is rectified into DC (about 530V)，3-phase 220V work
frequency AC is rectified into DC (about 310V), then is converted to medium frequency AC (about 20K
Hz) by inverter device (IGBT module), after reducing voltage by medium transformer (the main
transformer) and rectifying by medium frequency rectifier (fast recovery diodes), then is outputted DC
or AC by selecting IGBT module. The circuit adopts current feedback control technology to insure
current output stability. Meanwhile, the welding current parameter can be adjusted continuously and
steplessly to meet with the requirements of the welder.
Note: Please refer to the nameplate about the right power supply connection (three phase 220v or
three phase 380v). Incorrect power connection may cause machine failure!

SUMMARY
12
Recti
fier
Invert
er
Tran
sform
er
Recti
fier
Hall
devic
e
Current feedback
control
Three-phase, AC DC AC DC
380V，50Hz
(220V,50Hz)
AC Invert
er
AC or DC
Control
signal
AC or DC
t
2.4 Volt-Amperage Characteristic
ArcoTig 250W/315W AC/DC welding machines have an excellent volt-amperage characteristic,
whose graph is shown as the following figure. The relation between the conventional rated loading
voltage U2and the conventional welding current I2is as follows:
When I2≤600A，U2=10+0.04I2(V); When I2＞600A, U2=34(V).
50
34
10
0600 I2（A）
U2（V）
Working
point
Volt-ampere characteristic The relation between the
conventional loading
voltage and welding current

INSTALLATION AND ADJUSTMENT
13
3 Installation and Adjustment
3.1 Parameters
Mod
els
Parameters
250W (ArcoTig 250W) 315W (ArcoTig 315W)
Input Voltage（V）3~380±10%，50Hz 3~220±10%，50Hz 3~380±10%，50Hz 3~220±10%，50Hz
Rated input
current（A）
TIG MMA TIG MMA TIG MMA TIG MMA
11.8(AC)
10.7(DC)
15.0(AC)
14.5(DC)
19.0(AC)
18.4(DC)
25.8(AC)
25.4(DC)
15.9(AC)
14.6(DC)
17.8(AC)
15.7(DC)
25.
3(A
C)
24.
8(D
C)
28.6 (AC)
27.8(DC)
Rated input power
（KW）
7.3(AC)
6.7(DC)
9.3(AC)
8.9(DC)
6.8(AC)
6.5(DC)
9.1(AC)
8.9(DC)
9.7(AC)
9.0(DC)
10.8(AC)
9.7(DC)
9.1(
AC)
8.7(
DC)
10.2(AC) 9.7(DC)
Max no-load
voltage(V) 50 50(adjustable)
TIG MMA TIG MMA
AC
DC
AC
DC
AC
DC
AC
DC
REC SIN TRI REC SIN TRI REC SIN TRI REC SIN TRI
ran
ge of start
current（A）
10~
250
30~
140
30~
165
5~
250
10~
250
30~
140
30~
165
5~
250
10~
315
30~
140
30~
165
5~
315
10~
315
30~
170
30~
200
5～
315
range of welding
current（A）
10~
250
30~
140
30~
165
5～
250
10~
250
30~
140
30~
165
5～
250
10~
315
30~
165
30~
165
5~3
15
10~
315
30~
170
30~
200
5～
315
up slope time（S）0～10 0～10
down slope time
（S）0～10 0～10
Pre-gas time（S）0.1～10 0.1～10
post-gas time（S）1～10 1～10
Pulse Frequency
（Hz）0.5～200 0.5～200
Pulse Duty（%）5～100 5～100

INSTALLATION AND ADJUSTMENT
14
AC Frequency（Hz
）
25～250 25～250
Clean Effect（%）15～50 15～50
ARC Thrust 0～10 0～10
Thermal ARC 0～10 0～10
ARC Length 0～10 0～10
Efficiency Duty
cycle（40℃，10
minutes）
AC DC AC DC AC DC
70% 250A 60% 250A 60%315A 70% 270A
100% 210A 100% 200A 100% 220A 100% 210A
Protection class IP23 IP23
Insulation class F F
Dimensions of
Machine
（L×W×）（mm）
470*250*400 530*250*400
23.0 23.0
3.2 Duty cycle & Overheat
Duty cycle is defined as the proportion of the time that a machine can work continuously within a
certain time (10 minutes). The rated duty cycle means the proportion of the time that a machine
can work continuously within 10 minutes when it outputs the rated welding current.
If the welder is overheating, the IGBT over-heat protection unit inside it will output an instruction
to cut output welding current and brighten the over-heat pilot lamp on the front panel. At this
time, the machine should be relaxed for 15 minutes to cool the fan. When operating the machine
again, the welding output current or the duty cycle should be reduced.
3.3 Movement and placement
Please take care for the welder when moving it, and do not sit on uneven ground.
It also can be moved by the handle on the top of the welder. Place the welder carefully when
moving it to the right position. When the machine gets to the destination, it needs to be secure to
prevent movement.

INSTALLATION AND ADJUSTMENT
15
Movement may result in the potential danger or substantive hazard, so please make sure that the
machine is in a safe position before using it.
3.4 Power supply input connection
ARCOTIG HF 315 AC/DC welding machines’ power supply connects to 3-phase 380V（3-phase
220V）
Note: Please refer to the nameplate about the right power supply connection (three phase 220v
or three phase 380v). Incorrect power connection may cause machine failure!
When the power supply voltage is over the safe work voltage, there are over voltage and under
voltage protections inside the welder, the alarm light will be activated, at the same time, the
current output will be cut off.
If the power supply voltage continually goes beyond the safe work voltage range, it will shorten
the welder’s lifespan. The below measures can be used:
Change the power supply input net. Such as, connect the welder with the stable power
supply voltage of distributor;
Reduce the machines power output to safe limits.
Set the voltage stabilization device in the front of power cable input.
3.5 Polarity Connection（MMA）
MMA (DC): Choosing the connection of DCEN or DCEP according to the different electrodes.
Please refer to the electrode manual.
MMA (AC): No requirements for polarity connection.
take ArcoTig HF250W/315W ACDC as an example

INSTALLATION AND ADJUSTMENT
16
.
3.6 Assembling the equipment (TIG)
(ArcoTig 250W/315W ACDC)

INSTALLATION AND ADJUSTMENT
17
(ArcoTig 250W/315W ACDC)
Note: the red and blue water pipes on front panel are connected with torch.
the red and blue water pipes on real panel are connected with water box.
Workpiece is connected to the positive electrode of welding machine, and welding torch is
connected to the negative electrode, which is called DC NEGATIVE CONNECTION.
Generally, it is usually operated in DC POSITIVE CONNECTION in TIG welding mode.
The control cable of torch switch consists of 2 wires, pedal control of 3 wires and the aero
socket has 14 leads.
Consumable parts for TIG torch, such as tungsten electrode、tip、gas nozzle、electrode
shield(short/long) , please enquire us by mail or phone according to the accessory codes.
When the welding machines are operated in HF ignition method, the ignition spark can cause
interferences in equipment near the welding machine. Be sure to take specially safety
precautions or shielding measures.

MAINTENANCE AND TROUBLESHOOTING
18
HF 315 AC/DC OPERATION
The layout of the Front Panel
1. Amperage Display
7. Next Step Function Tig
Settings
8. 50mm Positive
Dinse Female
9. Quick Connect
Gas Outlet
10. 14 Pin Tig
Plug Connection
13. Amperage Adjustment
14. 50mm Negative
Dinse Female
12. Quick Connect
Blue Water-Cooling Female
11. Quick Connect
Red Wat er-Cooling Female
18. Voltage/
Frequency/Hz, Display
15. Next Step
Function Tig Settings
2. Water Cooling / Gas
Cooling Function
3. 2T/4T Trigger
4. Gas Purge
5. High Frequency Tig
6. Pulse Function
17. Waveform Control
16. AC/DC Function

MAINTENANCE AND TROUBLESHOOTING
19
HF 315 AC/DC OPERATION
The layout of the Back Panel
19. On/Off Switch
20. Primary Power Lead
24. Remote amphenol plug
23. Quick Connect Gas FItting
22. Quick Connect Blue
Cooling Hose
21. Quick Connect Red Cooling
Hose

OPERATION
20
4.2 Control panel
(2) Mode selecting key
(3) Gas-test key
(10) Power/Alarm indicator
(11) Welding voltage/other parameter display
(9) Rod electrode welding key
(12) Welding current display
(4) HF (high-frequency)
iii k
(5) Pulse key
(6) Parameter selection key (7) Parameter selection key(8) Adjusting dial
(1) Waveform Control
Water cooling and gas
cooling selecting key