Linde BOC RAPTOR User manual

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180 TIG ACDC
Operating Manual

2
Welcome to a better way of welding
Congratulations on puchasing the Raptor 180 TIG ACDC weldingmachine.
The products in BOC's range perform with reliability and have the backing of one of
South Pacic's leading welding suppliers.
This operating manual provides the basic knowledge required for TIG welding, aswell
as highlighting important areas of how to operate the Raptor machine.
With normal use, and by following these recommended steps, your Raptor machine
can provide you with years of trouble-free service.
Raptor equipment and technical support is available through the national
BOCCustomer Engagement Centre or contact your local Gas & Gear outlet.
Important Notice: This document has been prepared by BOC
Limited ABN 95 000 029 729 ('BOC'), as general information and
does not contain and is not to be taken as containing any specic
instructions. Thedocument has been prepared in good faith and is
professional opinion only. Information in this document has been
derived from third parties, and though BOC believes it to be reliable
as at the time of printing, BOC makes no representation or warranty
as to the accuracy, reliability or completeness of information in this
document and does not assume any responsibility for updating any
information or correcting any error or omission which may become
apparent after the document has been issued. Neither BOC nor
any of its agents has independently veried the accuracy of the
information contained in this document. The information in this
document is commercial in condence and is not to be reproduced.
The recipient acknowledges and agrees that it must make its own
independent investigation and should consider seeking appropriate
professional recommendation in reviewing and evaluating
the information. This document does not take into account the
particular circumstances of the recipient and the recipient should
not rely on this document in making any decisions, including but not
limited to business, safety or other operations decisions.
Except insofar as liability under any statute cannot be excluded,
BOC and its a󹟾liates, directors, employees, contractors and
consultants do not accept any liability (whether arising in contract,
tort or otherwise) for any error or omission in this document
or for any resulting loss or damage (whether direct, indirect,
consequential or otherwise) su󹟽ered by the recipient of this
document or any other person relying on the information contained
herein. The recipient agrees that it shall not seek to sue or hold
BOC or their respective agents liable in any such respect for the
provision of this document or any other information.

1.0 Recommended Safety Guidelines 4
2.0 Recommended Safety Precautions 5
2.1 Health Hazard Information 5
2.2 Personal Protection 5
2.3 Cylinder Safety 6
2.4 Electrical Shock 7
2.5 User Responsibility 7
Switch on to electrical safety 8
3.0 Package Contents 11
4.0 Connections 12
4.1 Power 12
4.2 Shielding gas 12
4.3 TIG torch connection 12
4.4 MMA operation 12
4.5 TIG welding operation 12
5.0 Control Panel and Display 14
5.1 Control Panel 14
5.2 Display symbols for MMA welding 15
5.3 Display symbols for TIG welding 15
6.0 Installation & Operation TIG welding 16
6.1 Installation for TIG welding 16
6.2 Starting up 17
6.3 Operation for TIG mode 17
6.4 Adjusting parameters 18
6.5 Start welding 19
6.6 DC current in TIG welding 19
7.0 Installation & Operation MMA welding 20
7.1 Installation for MMAwelding (DCEP) 20
7.2 Operation for MMA mode 21
7.3 Installing Adjustable Shoulder Strap 22
8.0 Machine Specifications 23
9.0 Gas Tungsten Arc Welding Process
(GTAW/TIG) 24
9.1 Introduction 24
9.2 Process 24
9.3 Process variables 25
9.4 Shielding gas selection 26
9.5 Welding wire selection 26
9.6 Tungsten electrode selection 27
9.7 Welding techniques 29
9.8 Torch movement during welding 29
9.9 Positioning torch tungsten for various
weldjoints 30
9.10 Joint preparation 31
10.0 TIG welding of materials 33
10.1 Application summary 33
10.2 C-Mn steel 33
10.3 Alloyed steel 34
10.4 Stainless steel 34
10.5 Copper and copper alloys 35
10.6 Welding Parameter for TIG 36
11.0 Manual Metal Arc Welding Process
(MMAW) 37
11.1 Process 37
11.2 Welding Machine 37
11.3 Welding Technique 38
11.4 Electrode Selection 38
11.5 Types of Joints 41
11.6 Fillet Welds 43
11.7 Typical Defects Due to FaultyTechnique 46
11.8 Welding Parameter for MMA 49
12.0 Periodic Maintenance 50
12.1 Power Source 50
13.0 Troubleshooting and Fault Finding 51
13.1 Environment 51
13.2 Problems During MMA Welding 51
13.3 Fault Finding 52
14.0 Warranty Information 53
14.1 Terms of Warranty 53
14.2 Limitations on Warranty 53
14.3 Warranty Period 53
14.4 Warranty Replacement 53
Contents

4
• Repair or replace defective cables immediately.
• Never watch the arc except through
lenses of the correct shade.
• In conned spaces, adequate ventilation and
constant observation are essential.
• Leads and cables should be kept clear
of passageways.
• Keep re extinguishing equipment at a handy
location in the shop.
• Keep primary terminals and live parts e󹟽ectively
covered.
• Never strike an electrode on any gas cylinder.
• Never use oxygen for venting containers.
1.0 Recommended Safety Guidelines
Diagram and safety explanation
Electrical safety alert
Welding electrode causing
electric shock
Fumes and gases coming from
welding process
Welding arc rays
Read instruction manual
Become trained
Diagram and safety explanation
Wear dry, insulated gloves
Insulate yourself from
work and ground
Disconnect input power before
working on equipment
Keep head out of fumes
Use forced ventilation or local
exhaust to remove fumes
Use welding helmet with
correct shade of lter
Some safety precautions BOC recommends are as follows:

5
2.1 Health Hazard Information
The actual process of welding is one that
can cause a variety of hazards. All appropriate
safety equipment should be worn at all times, i.e.
headwear, respiratory, hand and body protection.
Electrical equipment should be used in accordance
with the manufacturer’s recommendations.
Eyes
The process produces ultra violet rays that can
injure and cause permanent damage. Fumes can
cause irritation.
Skin
Arc rays are dangerous to uncoveredskin.
Inhalation
Welding fumes and gases are dangerous to the
health of the operator and to those in close
proximity. The aggravation of pre-existing
respiratory or allergic conditions may occur in some
workers. Excessive exposure may cause conditions
such as nausea, dizziness, dryness and irritation of
eyes, nose andthroat.
2.2 Personal Protection
Respiratory
Conned space welding should be carried out
with the aid of a fume respirator or air supplied
respirator as per AS/NZS 1715 and AS/NZS 1716
Standards.
• You must always have enough ventilation in
conned spaces. Be alert to this at all times.
• Keep your head out of the fumes rising from
thearc.
• Fumes from the welding of some metals could
have an adverse e󹟽ect on your health. Don’t
breathe them in. If you are welding on material
such as stainless steel, nickel, nickel alloys
or galvanised steel, further precautions are
necessary.
• Wear a respirator when natural or forced
ventilation is not good enough.
Eye protection
A welding helmet with the appropriate welding
lter lens for the operation must be worn at all
times in the work environment. The welding arc
and the reecting arc ash gives out ultraviolet
and infrared rays. Protective welding screen and
goggles should be provided for others working in
the same area.
Recommended filter shades for arc welding
Less than 150 amps Shade 10*
150 to 250 amps Shade 11*
250 to 300 amps Shade 12
300 to 350 amps Shade 13
Over 350 amps Shade 14
*Use one shade darker for aluminium
Clothing
Suitable clothing must be worn to prevent
excessive exposure to UV radiation and sparks. An
adjustable helmet, ameproof loose tting cotton
clothing buttoned to the neck, protective leather
gloves, spats, apron and steel capped safety boots
are highly recommended.
2.0 Recommended Safety Precautions

6
2.3 Cylinder Safety
1Cylinder valve hand-wheel
2Back-plug
3Bursting disc
Back view of typical
cylinder valve
1
2
3
Operator wearing personal
protective equipment
(PPE) in safe position
Ten Points about Cylinder Safety
1Always read the labels and Safety Data Sheet
(SDS) before use.
2Store cylinders upright and use in
well-ventilated, secure areas away from
pedestrian or vehicle thoroughfares.
3Ensure cylinders are appropriately secured
and guarded against being knocked violently
or being allowed to fall.
4Wear safety shoes, glasses and gloves when
handling, connecting and using cylinders.
5Ensure cylinders are appropriately restrained
to mechanical lifting/handling devices prior
to movement.
6Keep in a cool, well-ventilated area, away
from heat sources, sources of ignition and
combustible materials, especially ammable
gases.
7Keep full and empty cylinders separate.
8Keep ammonia-based leak detection
solutions, oil and grease away from cylinders
and valves.
9Never use force when opening or closing
valves.
10 Never repaint or disguise markings and
damage on cylinders. If damaged, return
cylinders to BOC immediately.
Cylinder Valve Safety
When working with cylinders or operating
cylinder valves, ensure that you wear appropriate
protective clothing – gloves, boots and safety
glasses.
Ensure cylinder value is closed before moving or
disconnecting equipment.
Before operating a cylinder valve:
Ensure that the system you are connecting the
cylinder into is suitable for the gas and pressure
involved.
Cylinder valves should not be open unless a
pressure regulator has been tted.
Ensure that any accessories (such as hoses
attached to the cylinder valve, or the system being
connected to) are securely connected. Ahose, for
example, can potentially ail around dangerously
if it is accidentally pressurised when not restrained
at both ends.
Stand to the side of the cylinder so that neither
you nor anyone else is in line with the back of
the cylinder valve. This is in case a back-plug is
loose or a bursting disc vents. The correct stance is
shown in the diagram above.
When operating the cylindervalve
Open it by hand by turning the valve hand-wheel
anti-clockwise. Use only reasonable force.
Ensure that no gas is leaking from the cylinder
valve connection or the system to which the
cylinder is connected. DO NOT use ammonia-
based leak detection uid as this can damage
the valve. Approved leak detection uid, can be
obtained from a BOC Gas & Gear centre.
When nished with the cylinder, close the cylinder
valve by hand by turning the valve hand-wheel in
a clockwise direction. Use only reasonable force.
Remember NEVER tamper with thevalve. If
you suspect the valve is damaged, DONOT
use it. Report the issue to BOC and arrange
for the cylinderto be returned to BOC.

7
2.4 Electrical Shock
• Never touch ‘live’ electrical parts.
• Always repair or replace worn or damagedparts.
• Disconnect power source before performingany
maintenance or service.
• Earth all work materials.
• Never work in moist or damp areas.
Avoid electric shock by
• Wearing dry insulated boots
• Wearing dry leather gloves
• Never changing electrodes with bare
handsorwet gloves
• Never cooling electrode holders in water
• Working on a dry insulated oor where possible
• Never hold the electrode and holder under
yourarm.
2.5 User Responsibility
• Read the Operating Manual prior to installation of
this machine.
• Unauthorised repairs to this equipment may
endanger the technician and operator and will
void your warranty. Only qualied personnel
approved by BOC should perform repairs.
• Always disconnect mains power before
investigating equipment malfunctions.
• Parts that are broken, damaged, missing or worn
should be replaced immediately.
• Equipment should be cleaned periodically.
BOC stocks a huge range of personal protective
equipment. This, combined with BOC’s extensive
Gas and Gear network, ensures fast, reliable
service throughout the South Pacic.
PLEASE NOTE that under no circumstances should
any equipment or parts be altered or changed in
any way from the standard specication without
written permission given by BOC. To do so, will void
the EquipmentWarranty.
Further information can be obtained from
Weld Australia (WTIA) Technical Note No.7
‘Health and Safety Welding’
Published by Weld Australia,
PO Box 6165 Silverwater NSW 2128
Phone [phone].
STOP

8
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BOC welding machines are designed and manufactured to conform
to IEC 60974 or AS 60974. This Standard not only covers themachine
but also the input cable and plug requirements including the size of
theplug that should be used.
X
Rated duty cycle
I0
Rated no-load
supply current
I1
Rated
supply current
AS 60974-1
Formula in clause 3.33
Maximum effective supply current
I1eff = √I12×X+I02(1-X)
The I1e󹟽 determines thecorrect plug, input cable
andinput current required for each machine.
10A
I1eff ≤
I1eff ≤
I1eff ≤
I1eff ≤
1. 5 – 2 . 5 m m 2
min –max cable size
size must be indicated
on the cable
15A 1. 5 – 4 m m 2
25A 2 .5 – 6 mm2
32A 4 – 10 m m 2
Before operating your welding machine, follow the instructions in the operating
manual. For more information refer to WTIA TN 22 – Welding Electrical Safety (Revised
2003) and WTIA TN 07 Health &Safety in Welding. If you have any queries please
contact BOC 131 262 (AU), 1800 111 333 (NZ).
Remember…
Switch on to
electrical safety
for single-phase equipment

9
DO
Example
How important is the correct input cable and
plug on a welding machine?
The size of the plug depends on a formula that
not only uses the maximum current draw but
also the duty cycle of the power source. Theuse
of any welding power source will not only cause
the machine itself to heat up, but the input cable,
plug and mains power circuit will increase in
temperature as well. That’s why it’s important
to understand input and output currents and to
make sure that the input circuit is correctly rated
to supply the required input draw. Thisallows the
machine to operate at or near maximum output
and protects the circuit board from tripping,
overheating and/or catchingre.
Foryour safety, BOC meets AS/NZS Standards
for safe electricalcompliance.
Regulatory Compliance Mark
(RCM) andnumber
All BOC welding machines undergo an independent
certication process to meet Australian and New
Zealand regulations regarding electrical safety.
The triangle-circle-tick (RCM) symbol signies
that BOC has taken the necessary steps to have
the product comply with the electrical safety
and/or electromagnetic compatibility (EMC)
legislative requirements as specied by the
Electrical Regulatory Authorities Council (ERAC).
Depending on the machine, BOC may be required
to have a 32A single phase plug to ensure that
when the machine runs at its maximum output, the
input supply plug and lead will not overheat. For
your safety, please check for this symbol before
buying any welding machine in Australia and
NewZealand.
✓ Use the correct input current, ✓ cable and
✓ plug in accordance with AS60974-1 for your
safety and to get the maximum performance
from your welding machine.
If the I1e󹠢 rating on your machine is 27A
then you must use a 32A plug as a 15A
is undersized for the welding current
being used and may cause the cable to
overheat.

10
Always
DON‘T
Example of BOC rating plateCheck the rating plate onyourmachine.
All welding machines that comply with IEC 60974
or AS 60974 must have a rating plate similar to the
one shown. Welding machines draw some current
when idle (not welding) and a higher current
when welding. E󹟽ective rated primary current
(I1e󹟽 ) combines the conductor heating due to
these two levels of current. I1e󹟽 is the maximum
rated e󹟽ective supply current that determines
the minimum plug and input cable rating as well
as the minimum capacity of the input circuit that
the machine gets plugged into to safely operate
the machine. Look for the I1e󹟽 on the welding
machine’s rating plate and ensure that you have
the correct input circuit to support this powerdraw.
What if I don’t have a 240volt 15amp or
32 ampoutlet?
If you don’t have a suitable power outlet, you
should contact a qualied electrician to advise
whether the wiring in your building will cater for
a 15 amp or 32 amp outlet. You mayalso need
to upgrade your circuit breakers and possibly
switchboard to suit. Failure to do this may cause
an electrical re in the building which may
voidinsurances.
✖ Don’t risk damage to your machine or cause
tripping and/or re by using the wrong
input current, cable orplug.
✖ Don’t tamper with plugs or ledown earth
pins. Doing so willvoidwarranty.
✓ Inspect cables and plugs regularly.
✓ Contact a qualied electrician for advice
and/or upgrade and, if needed, to replace
any damaged plugs orcables.
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11
3.0 Package Contents
Package consists ofthe following:
• Power source with input cable and plug
• Work return lead
• TIG torch
• MMA electrode holder and cable
• Regulator
• Gas hose
• Operating manual

12
4.1 Power
The machine is designed to operate on a 240V
±15% input single phase AC outlet. The machine
is supplied with a heavy duty 10A input plug.
Ensure that there is adequate ventilation around
the machine when it is connected to the mains
powersupply.
4.2 Shielding gas
When working in TIG mode this welding process
requires shielding gas. The shielding gas can be
supplied via a regulator to the machine from either
a xed installation or single cylinder of gas.
If a cylinder of gas is used, please ensure that the
cylinder is securely fastened (refer to the section
on cylinder handling and safety), before starting
any welding operation.
4.3 TIG torch connection
The Raptor 180 TIG ACDC machine is rated at 180A
at 10% duty cycle.
The TIG torch is tted to the machine by means
of the Safe Lock dinse back end. For DC (-) TIG
operation, t the torch back end to the negative
dinse connection. Similarly for DC (+), t the torch
back end to the positive dinse connection.
The gas hose is tted to the gas tting (GAS)
located on the front bottom panel of the machine.
4.4 MMA operation
The Raptor 180 TIG ACDC can be used as an MMA
welding machine by tting an electrode holder
and work return lead to the respective dinse
connectors (dependent on the type of electrodes
being used).
When using your Raptor 180 TIG ACDC machine in
MMA mode, ensure that the TIG/MMA selector is
switched to the MMA position.
4.5 TIG welding operation
The Raptor 180 TIG ACDC is tted with an option of
High Frequency (HF) start mode. The arc would be
initiated by keeping a distance of 2–4 mm between
the workpiece and the tungsten. The HF will be
initiated by depressing the contactor switch.
Once the arc is initiated, the HF will automatically
turno󹟽.
4.0 Connections

13
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55
66
77
88
22114433
Max. eective supply current (I1e) Input cable size
I1e󹟽 ≤10 A 1.5–2.5 mm2
I1e󹟽 ≤16 A 1.5–4 mm2
I1e󹟽 ≤25 A 2.5–6 mm2
I1e󹟽 ≤35 A 4–10 mm2
I1e󹟽 ≤50 A 6–16 mm2
I1e󹟽 ≤63 A 10–25 mm2
Front Connections of Raptor 180 TIG ACDC Back Connections of Raptor 180 TIG ACDC
1 Welding cable quick socket
(+ Positive output terminal)
In TIG mode, connect with work piece;
In MMA mode, connect with electrode
holder.
2 Remote Control socket
Connected to torch control.
3 Gas outlet
Connect with TIG torch gas connector.
4 Welding cable quick socket
(– Negative output terminal)
In TIG mode, connect with TIG torch;
In MMA mode, connect with work piece
5 Power switch
Use this switch to supply single phase 240V
AC power for welding machine. When switch
is ON, control panel will light up, and the fan
begins to run.
6 Power supply cable
Comes with a 10A plug.
7 Gas inlet
Connect gas regulator via gas hose
8 Fan
Cools down heating device inside welding
machine.

14
Control Panel of Raptor 180 TIG DC
5.0 Control Panel and Display
Icon Name Description
95'
+)
6
7
7
3
Adjustment knob
Rotate the knob directly to set welding current.
With the “menu button”, rotate the knob to set pre-gas time, start
current, up-slope time, etc.
95'
+)
6
7
7
3
Welding mode
button
Used to switch the MMA and TIG mode.
The TIG mode includes TIG (AC) and TIG (DC)
Remote indicator The indicator lights up when the parameters are set by the digital
TIG torch or the foot control is connected.
95'
+)
6
7
7
3
Menu button
MMA mode
Long press (3s): Open/close the VRD function.
Short press: switch the hot start current, hot start time and
arcforcecurrent.
TIG mode
Long press (3s): switch the 2T, 4T, and spotmode
Short press: switch the pre/post gas time, up-slope time/
down-slope time, start current, stopcurrent, pulse
frequency,etc.
5.1 Control Panel

15
Icon Name Description
95'
+)
6
7
7
3
VRD indicator Under the MMA mode, open/close the VRD function by pressing and
holding the “menu button”.
Electrode type
Please select the type of electrode according to the actual situation.
E6013: acid electrode
E6010: cellulose electrode
E7018: basic electrode
Electrode diameter Value range: Φ1.6mm-Φ4.0mm
Hot start current Value range: –20 to 20%
Hot start time Value range: 0 – 1s
Arc force current Value range: –20 to 20%
5.2 Display symbols for MMA welding
Icon Name
Suitable for
Value rangeTIG(AC) TIG(DC) Spot mode
AC frequency ✓ 50Hz – 100Hz
Pre gas ✓ ✓ ✓ 0.1s – 9.9s
Start current ✓ ✓ ✓ 10% - 100%
up-slope time ✓ ✓ ✓ 0 – 9.9s
down-slope time ✓ ✓ ✓ 0 – 9.9s
Stop current ✓ ✓ ✓ 10% - 100%
Post gas ✓ ✓ ✓ 0 – 9.9s
AC balance
(cleaning) ✓ 20% - 70%
Pulse frequency ✓ ✓ ✓ AC: 0 – 5Hz
DC: 0 – 200Hz
Base current ✓ ✓ ✓ 10% - 50%
Pulse width ✓ ✓ ✓ 1% - 99%
Spot welding time ✓ 0.1s - 9.9s
5.3 Display symbols for TIG welding

16
Installation for TIG setup
6.1 Installation for TIG welding
1 Plug the work return lead into output socket ,
and tighten rmly.
2 Connect work return clamp to the work piece.
3 Plug the 8-pin plug of TIG torch into the welding
machine controlsocket.
4 Plug gas and electric connector of TIG torch to
welding machine’s gasand electric socket, and
tighten rmly.
5 Connect gas regulator to gas cylinder.
6 Connect one end of gas hose to gas outlet of
gas regulator. Fasten the hose clamp. Connect
the other end to gas inlet on rear panel of
welding machine.
7 Connect with single phase 240V power supply.
Turn power switch ON (switch is located on the
back of the welding machine).
6.0 Installation & Operation TIG welding
7
15A
5
2
134
6

17
4. TIG/AC (with pulse)
1. TIG/DC (without pulse) 2. TIG/AC (without pulse)
3. TIG/DC (with pulse)
WARNING
It is dangerous to connect or disconnect
the gashose orconnector whilst welding.
IMPORTANT
Before you begin a welding operation,
please press the torch switch for a few
seconds until allthe air in the gas tube
isremoved.
6.2 Starting up
Switch on the machine using the Power Switch. The
panel will display the previous settings that were
saved in the last shutdown.
6.3 Operation for TIG mode
Set welding mode
Press the welding menu button
95'
+)
6
7
7
3
on the front
panel to choose the welding mode. The machine
enters TIG mode when TIG symbol is shown on
thedisplay.
There are four TIG modes: TIG/DC (without pulse),
TIG/AC (without pulse), TIG/DC (with pulse) and
TIG/AC (with pulse). (Figures 1-4).

18
5. 2T mode
6. 4T mode
7. Spot mode
8. Adjusting parameters
Choose 2T / 4T / Spot mode
Under the TIG welding mode, there are three
modes: 2T, 4T and Spot. Press the welding menu
button
95'
+)
6
7
7
3
for 3 seconds, and then release to
choose the mode, as shown in gures5-7.
6.4 Adjusting parameters
Under the TIG mode, select the 2T, 4T or Spot mode
rst by pressing the welding menu button
95'
+)
6
7
7
3
for
3seconds.
Select the parameters to be set by pressing the
welding menu button
95'
+)
6
7
7
3
, and then adjusting the
parameter value using the AdjustmentKnob
(Figure 8).
• The Start Current (Figure 6) and Up-slope time
(Figure 7) are invalid under 2T (HF) mode.
• The spot welding time (Figure 11) is only used in
spot (HF) mode.
NOTE: When the digital TIG torch is connected,
the remote indicator will light up by
pressing the torch switch for 10s, and the
current could be adjusted by the knob on
the TIG torch.
The congured parameter value will be
automatically saved.

19
6.6 DC current in TIG welding
For direct current (DC) TIG welding
Select the correct size and type of non consumable
tungsten and shielding gas for the application.
(See Shielding gas selection on page12.)
For (DC–) (most commonly used polarity) connect
the TIG torch to the negative Dinse plug connector
and the work return lead to the positive dinse
plugconnector.
For (DC+) applications connect the TIG torch to the
positive dinse plug connector and the work return
lead to the negative dinse plug connector. In this
mode most of the heat is generated within the
non-consumable tungsten and the heat input into
the plate is reduced resulting in lower penetration
depths. Larger tungstens are normally selected for
this application.
Ensure that the MMA/TIG selector switch is in the
TIG position.
For DC Pulse TIG welding
DC welding of thin material can further be
enhanced by using the pulse mode. When using
the pulse mode for DC applications, the current
will be varied between the welding current and
a pre-selected background current. Additionally,
the pulse frequency can be adjusted. By adjusting
the pulse frequency, the optimum heat input for a
particular application can be obtained.
Downslope control
The downslope of the welding current can
be adjusted by adjusting the Down slope. By
increasing the downslope control time, it allows for
better crater lling characteristics.
6.5 Start welding
The machine uses HF to initiate the welding arc.
HF: Keep 2-4 mm space between tungsten
electrode and work piece, press the torch
switch, the machine will start to work after the
pre gas ow time.
When welding is terminated, keep the torch
directed at the weld pool to allow the shielding gas
to protect and cool the solidifying weld metal in
order to prevent defects.

20
Installation for MMA process
7.1 Installation for MMAwelding (DCEP)
1 Plug the work return lead into output socket ,
and tighten rmly.
2 Connect the work return clamp to the work
piece.
3 Plug the electrode holder cable into output
socket , and tightenrmly.
4 Connect with single phase 240V power supply.
Turn power switch ON (switch is located on the
back of the welding machine).
5 Press the bottom left button to select function:
MMA
7.0 Installation & Operation MMA welding
4
3
2
1
Please check the welding electrode manufacturer's
polarity recommendation before commencing with
MMA welding.
Direct Current Electrode Negative (DCEN):
The positive output terminal is connected to the
workpiece, and the negative output terminal is
connected to the electrode holder.
Direct Current Electrode Positive (DCEP):
The positive output terminal is connected to the
electrode holder, and the negative output terminal
is connected to the workpiece.