WIA WELDARC 135 User manual

WELDING.COM.AU
From serial numbers M1102A*, M1112A*, M1122A*
Stick/TIG Welders
OPERATORS MANUAL | MC110-0 / MC111-0 / MC112-0

32
WELDING INDUSTRIES
AUSTRALIA
A Division of ITW Australia Pty Ltd
ABN: 63 004 235 063
1300 300 884
Email: [e-mail]
welding.com.au
WELDWELL
NEW ZEALAND
A Division of ITW New Zealand
NZBN: 9 429 039 833 129
GST NO: 080177186
0800 9353 9355
Email: [e-mail]
weldwell.co.nz

32
CONTENTS
Section General Information Page
Safe Practices 4
1 Introduction 7
2 Receiving 8
3 Specifications 8-9
4 Features 10-11
4.1 VRD 10
4.2 Fan on Demand 10
4.3 Shoulder Strap 11
4.4 Hot Start 11
4.5 Arc Force 11
4.6 Power Factor Correction 11
5 Controls 145 & 185 12
Controls 135 13
6 Installation 14
7 Basic Welding Information 14-16
8 General Maintenance 16
9 External Trouble Shooting 16
10 Trouble Shooting Chart 17-18
11 Service Information 19
12 Circuit Diagrams 20-22
13 Assembly & Parts List
Power Source 135 23-24
14 Assembly & Parts List
Power Source 145 25-26
15 Assembly & Parts List
Power Source 185 27-28
16 Australia Warranty
Information 29-30
17 New Zealand Warranty
Information 31

Weldarc 135, 145, 185 | Operator Manual | Model No MC110-0 / MC111-0 / MC112-0
54
READ FIRST
The information contained in this
manual is set out to enable you
to properly maintain your new
equipment and ensure that you
obtain maximum operating efficiency.
Please ensure that this information is
kept in a safe place for ready reference
when required at any future time.
When ordering spare parts, please
quote the model and serial number
of the power source and part
number of the item required. All
relevant numbers are shown in lists
contained in this manual. Failure to
supply this information may result in
unnecessary delays in supplying the
correct parts.
SAFETY
Before this equipment is put into
operation, please read the Safe
Practices section of this manual.
This will help to avoid possible injury
due to misuse or improper welding
applications.
HANDLES ON POWER SOURCE
Please note that the handle fitted to
the Weldarc welder is intended for
carrying the equipment by hand only.
DO NOT use this handle for
suspending or mounting the Weldarc
in any other manner.
SAFE PRACTICES WHEN USING
WELDING EQUIPMENT
These notes are provided in the interests
of improving operator safety. They should
be considered only as a basic guide to
Safe Working Habits. A full list of Standards
pertaining to industry is available from
the Standards Association of Australia,
also various State Electricity Authorities,
Departments of Labour and Industry or
Mines Department and other Local Health
or Safety Inspection Authorities may have
additional requirements. Australian Standard
AS1674.2 provides a comprehensive guide
to safe practices in welding.
Eye protection
NEVER LOOK AT AN ARC WITHOUT
PROTECTION. Wear a helmet with safety
goggles or glasses with side shields
underneath, with appropriate filter lenses
protected by clear cover lens. This is a
MUST for welding, cutting, and chipping to
protect the eyes from radiant energy and
flying metal. Replace the cover lens when
broken, pitted, or spattered.
Recommended Shade Filter Lens
Amps TIG MMAW MIG Pulsed
MIG
0-100 10 9 10 12-13
100-150 11 10 10 12-13
150-200 12 10-11 11-12 12-13
200-300 13 11 12-13 12-13
300-400 14 12 13 14
400-500 — 13 14 14
500 + — — 14 14

54
Burn protection
The welding arc is intense and visibly bright.
Its radiation can damage eyes, penetrate
light-weight clothing, reflect from light-
coloured surfaces, and burn the skin and
eyes. Burns resulting from gas-shielded
arcs resemble acute sunburn, but can be
more severe and painful.
Wear protective clothing – leather or heat
resistant gloves, hat, and safety-toed boots.
Button shirt collar and pocket flaps, and
wear cuffless trousers to avoid entry of
sparks and slag.
Avoid oily or greasy clothing. A spark may
ignite them. Hot metal such as electrode
stubs and work pieces should never be
handled without gloves.
Ear plugs should be worn when welding in
overhead positions or in a confined space.
A hard hat should be worn when others are
working overhead.
Flammable hair preparations should not be
used by persons intending to weld or cut.
Toxic Fumes
Adequate ventilation with air is essential.
Severe discomfort, illness or death can
result from fumes, vapours, heat, or oxygen
depletion that welding or cutting may
produce. NEVER ventilate with oxygen.
Lead, cadmium, zinc, mercury, and
beryllium bearing and similar materials
when welded or cut may produce harmful
concentrations of toxic fumes. Adequate
local exhaust ventilation 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 fumes should not be heated
unless coating is removed from the work
surface, the area is well ventilated, or the
operator wears an air-supplied respirator.
Work in a confined space only while it is
being ventilated and, if necessary, while
wearing an air-supplied respirator.
Vapours from chlorinated solvents can
be decomposed by the heat of the arc (or
flame) to form phosgene, a highly toxic
gas, and lung and eye irritating products.
The ultra-violet (radiant) energy of the arc
can also decompose trichlorethylene
and perchloroethylene vapours to form
phosgene. Do not weld or cut where solvent
vapours can be drawn into the welding or
cutting atmosphere or where the radiant
energy can penetrate to atmospheres
containing even minute amounts of
trichlorethylene or perchloroethylene.
Fire and Explosion Prevention
Be aware that flying sparks or falling slag
can pass through cracks, along pipes,
through windows or doors, and through
wall or floor openings, out of sight of the
operator. Sparks and slag can travel up to
10 metres from the arc.
Keep equipment clean and operable, free
of oil, grease, and (in electrical parts) of
metallic particles that can cause short circuits.
If combustibles are present in the work
area, do NOT weld or cut. Move the work if
practicable, to an area free of combustibles.
Avoid paint spray rooms, dip tanks, storage
areas, ventilators. If the work can not be
moved, move combustibles at least 10metres
away out of reach of sparks and heat; or
protect against ignition with suitable and
snug-fitting fire-resistant covers or shields.

Weldarc 135, 145, 185 | Operator Manual | Model No MC110-0 / MC111-0 / MC112-0
76
Walls touching combustibles on opposite
sides should not be welded on or cut. Walls,
ceilings, and floor near work should be
protected by heat-resistant covers or shields.
A person acting as Fire Watcher must be
standing by with suitable fire extinguishing
equipment during and for some time after
welding or cutting if;
– Combustibles (including building
construction) are within 10 metres.
– Combustibles are further than 10
metres but can be ignited by sparks.
– Openings (concealed or visible) in floors
or walls within 10 metres may expose
combustibles to sparks.
– Combustibles adjacent to walls,
ceilings, roofs, or metal partitions can
be ignited by radiant or conducted heat.
After work is done, check that area is free
of sparks, glowing embers, and flames.
A tank or drum which has contained
combustibles can produce flammable
vapours when heated. Such a container
must never be welded on or cut, unless
it has first been cleaned as described in
AS.1674.2. This includes a thorough steam
or caustic cleaning (or a solvent or water
washing, depending on the combustible’s
solubility), followed by purging and inerting
with nitrogen or carbon dioxide, and using
protective equipment as recommended in
AS.1674.2. Water-filling just below working
level may substitute for inerting.
Hollow castings or containers must be
vented before welding or cutting. They can
explode. Never weld or cut where the air may
contain flammable dust, gas, or liquid vapours.
Shock Prevention
Exposed conductors or other bare metal
in the welding circuit, or ungrounded
electrically alive equipment can fatally
shock a person whose body becomes
a conductor. Ensure that the equipment
is correctly connected and earthed. If
unsure have the equipment installed by a
qualified electrician. On mobile or portable
equipment, regularly inspect condition of
trailing power leads and connecting plugs.
Repair or replace damaged leads.
Fully insulated electrode holders should
be used. Do not use holders with
protruding screws. Fully insulated lock-type
connectors should be used to join welding
cable lengths.
Terminals and other exposed parts of
electrical units should have insulated knobs
or covers secured before operation.

76
1 INTRODUCTION
MMAW (Stick Welding)
Manual Metal Arc Welding (MMAW) is a
process where an arc is struck between a
flux-coated consumable electrode and the
work piece. The arc and the weld pool are
both shielded by gases generated by the
flux coating of the electrode.
The Weldarc 135, 145 and 185 has been
designed to be used with 2.0mm, 2.5mm,
3.2mm diameter electrodes, and the 185
can also be used with 4.0mm diameter
electrodes. The smaller electrodes are
used when welding at lower currents, such
as sheet metal applications. Increasing the
electrode diameter permits higher welding
currents to be selected.
WIA supplies a wide range of mild steel
and special purpose electrodes which cater
for home workshop, rural, and industrial
requirements. Some popular AUSTARC
electrodes are listed below. The correctly
selected AUSTARC electrode will influence the
quality of the weld, and the stability of the arc.
Austarc 12P, Classification E4313-A
A popular general purpose electrode used
with ease in all positions, vertical up or
down. The smooth forceful arc makes it an
ideal electrode for all general mild steel
applications.
Austarc 13S, Classification E4313-A
A smooth running electrode with a soft arc,
particularly suited to light sheetmetal and
smooth mitre fillet welds.
Austarc 16TC, Classification E4916-A
A low hydrogen electrode with good
arc stability and out-of-position welding
characteristics. This electrode is ideal
for medium carbon steels, or steels of
unknown analysis.
Unicord 312, Classification ES312-16
A high tensile, chromium nickel electrode
specially formulated for joining all alloy steels
and irons, and for tool and die maintenance.
Staincord 316L-016, Classification
E316L-16
For quality all position stainless steel
welding. Extra smooth running, high arc
stability, easy re-strike, excellent slag
removal and bead appearance.
Staincord 309Mo-16, Classification
E309LMo-16
For high quality all position stainless steel
welding. This extra low carbon alloy is
specifically indicated for AISI 309Mo type
alloys, but is also ideal for joining mild/low
alloy steel to a range of 300 and 400 series
stainless steels. Features extra smooth
running, high arc stability, easy re-strike,
excellent slag removal and bead appearance.
GTAW (TIG Welding)
For Weldarc 145 & 185 only.
Gas Tungsten Arc Welding (GTAW) is a
welding process where the arc is struck
between a non-consumable tungsten
electrode and the work piece. A ceramic
nozzle surrounds the tungsten electrode
and directs a flow of inert gas, usually Argon,
over the electrode and the weld zone. If
filler metal is required, it is hand fed into
the welding arc. The DC current output of
the Weldarc inverter is suitable for welding
most ferrous and non-ferrous metals, but is
not suitable for welding Aluminium for which
an AC machine is required.

Weldarc 135, 145, 185 | Operator Manual | Model No MC110-0 / MC111-0 / MC112-0
98
2 RECEIVING
Check the equipment received against the
shipping invoice to make sure the shipment
is complete and undamaged. If any damage
has occurred in transit, please immediately
notify your supplier.
The Weldarc inverter package contains;
– Weldarc Inverter Power Source
– Twist-lock Electrode Holder & Cable
– Work Clamp & Cable
– (This) Operating Manual
Optionally available
– TIG Torch with Gas Valve TIG001 for
Weldarc 145
– TIG Torch with Gas Valve TIG002 for
Weldarc 185
– Argon flow gauge regulator REG003
3 SPECIFICATIONS
Manufactured to Australian Standard - AS60974.1
VRD Complies with - AS1674.2 Category C.
WELDARC 135 WELDARC  WELDARC 
Primary Voltage 220-240 Vac,
50/60 Hz
220-240 Vac,
50/60 Hz
220-240 Vac,
50/60 Hz
Rated Primary
Current (I eff) 9.9 Amps 8.5 Amps 12.5 Amps
Maximum Primary
Current (I max) 22.2 Amps 19 Amps 25 Amps
Rated Output
@ 40°C
Duty cycle based on
10 minute cycle time
Stick
135 Amps, 25.4 V,
20% duty
78 Amps, 23.1 V,
60% duty
60 Amps, 22.4 V,
100% duty
Stick
145 Amps, 25.8 V,
20% duty
56 Amps, 22.2 V,
100% duty
TIG
145 Amps, 15.8 V,
20% duty
56 Amps, 12.2 V,
100% duty
Stick
185 Amps, 27.4 V,
25% duty
92 Amps, 23.7 V,
100% duty
TIG
185 Amps, 17.4 V,
25% duty
92 Amps, 13.7 V,
100% duty
If the supply cable is damaged it must
be replaced by the manufacturer, their
service agent or a similarly qualified
person.
IMPORTANT NOTICE: Warranty may
be voided if equipment is powered
from an unsuitable engine driven
generator.
Generators should have continuous
rating and incorporate output voltage
regulation. Refer to Specifications for
minimum generator capacity.
Generators without voltage regulation
must have a minimum capacity of 10 kW.

98
WELDARC 135 WELDARC  WELDARC 
Continuous Rated
Output@ 40°C 60 Amp 56 Amp 92 Amp
Welding Current 20 - 135 Amps 25 - 145 Amps 25 - 185 Amps
Open Circuit Voltage
VRD Enabled
VRD Disabled
Uo = 10V
Uo = 82V
Uo = 23 V
Uo = 78 V
Uo = 13 - 17 V
Uo = 78 V
Shipping Weight 8.0kg -
Includes leads
11kg -
Includes leads
11kg -
Includes leads
Shipping
Dimensions
400mm W
x 200mm D
x 310mm H
530mm W
x 185mm D
x 415mm H
530mm W
x 185mm D
x 415mm H
Power Source
Weight 4.0kg 7.0 k g 8.0kg
Main Circuit Breaker
Rating 20 Amps 20 Amps 25 Amps
Supply Plug 10 Amp 10 Amp 15 Amp
Fitted Supply Cable
1.5 mm2Three
Core, Heavy Duty
PVC
1.5 mm2Three Core,
Heavy Duty PVC
2.5 mm2Three Core,
Heavy Duty PVC
Power Supply Outlet
(240 V) & Extension
Lead Rating
10 Amp 10 Amp 15 Amp
Cooling Fan Cooled.
Continuous
Fan cooled.
Operates on
temperature
demand
Fan cooled.
Operates on
temperature
demand
IP Rating IP21S IP23S IP23S
Generator Power 8KVA @ 240 V 9KVA @ 240V 11.2KVA @ 240 V

Weldarc 135, 145, 185 | Operator Manual | Model No MC110-0 / MC111-0 / MC112-0
1110
4 FEATURES
4.1 VRD Function (Voltage Reduction
Device)
The VRD function is a safety feature, to
provide reduced open circuit voltage, when
not welding.
The VRD reduces the likelihood of
electrocution due to electrode handling,
while physically connected to work piece.
The VRD on the Weldarc 135, 145 and 185
complies with the requirements of AS
1674.2 for use in ‘Category C’ environments.
The machine will be supplied with VRD
enabled or disabled, depending on the
end market.
VRD Disabled
The open circuit output voltage is maximum
Volts DC.
The ‘VRD SAFE’ indicator on the front panel
will only light up momentarily during power up.
Machine is supplied with an orange tag on
the supply lead advising VRD is disabled.
VRD Enabled
When not welding the ‘VRD SAFE’ indicator
on the front panel will come on and the
output voltage will be reduced to the VRD
voltage level, which is below the required
safe level of 35V DC.
Change VRD Function
If the VRD function does not suit the
application, the VRD can be enabled or
disabled by an authorised WIA service agent.
Electrode Striking and Restriking -
VRD Enabled
When the electrode is struck on the work
piece the machine will detect a start
condition and increase the output voltage
to start welding. The ‘VRD SAFE’ indicator
will turn off.
To restrike a used electrode it may be
necessary to remove excess flux from
electrode tip.
The most effective strike action is a touch -
twist - lift.
4.2 Fan on Demand
Weldarc 145 & 185 has Fan on Demand
feature which operates the cooling fan only
when the internal temperature reaches a
preset level. Once the internal temperature
has dropped the fan will turn off.
When the machine is first turned on the
fan will operate momentarily, when the
machine is turned off the fan will also
operate momentarily while the internal
power supply decays.

1110
4.5 Arc Force
Arc force is a voltage boost. The extra
voltage is used when arc voltage drops due
to arc shorts.
For Weldarc 145 & 185 this can be adjusted
in setup mode.
4.6 Power Factor Correction (PFC)
For Weldarc 145 & 185 only.
PFC provides a input power conditioner
system to smooth the input current.
On a conventional inverter machine the
input current presents in short high current
pulses every half mains cycle. These
pulses, cause input voltage drop, on
extension leads and generators.
The PFC spreads the current pulse over the
whole mains cycle.
The overall effect is PFC provides stable
operation, on challenging power supplies,
particularly on long supply leads and
generators.
Power Factor Correction
4.3 Shoulder Strap
To attach the shoulder strap to the Weldarc,
feed the strap through the slot underneath
the handle at front and rear of machine.
4.4 Hot Start
Hot start is a boost current which is applied
at arc start. The extra current at start helps
get arc established, particularly on cold
material.
For Weldarc 145 & 185 this can be adjusted
in setup mode.
Attaching the Weldarc Shoulder Strap
INPUT
VOLTAGE
INPUT
CURRENT
WITHOUT
PFC
INPUT
CURRENT
WITH PFC

Weldarc 135, 145, 185 | Operator Manual | Model No MC110-0 / MC111-0 / MC112-0
1312
1 VRD Safe Mode Indicator
If VRD is enabled, this light is on when
the voltage across the output terminals is
reduced to a safe level.
If VRD is disabled, this light will always be off.
2 Power On Indicator
3 Over Temperature Indicator
This light is on if any internal thermal
protection devices have operated. Allow the
machine to cool down.
4 Weld Mode Selection Switch
(145 & 185 only)
Use this switch to select between modes.
There are two weld modes available:
4.1 TIG Welding (GTAW):
Lift arc start, using TIG welding torch with
separate gas supply.
4.2 Stick Electrode Welding (MMAW).
This mode is used for all MMAW stick
electrode process.
4.3 Setup Mode (145 & 185 only)
In Setup Mode the amount of Hot Start
and Arc Force can be adjusted.
Press and hold MODE button for 4 seconds,
until Digital Display will show “HS”. The Hot
Start current can be increased or decreased,
by adjusting the Weld Control Knob. Adjust
-10% to +10% of factory setting.
Press MODE button, the digital display will
show ”AF”. The Arc Force Voltage can be
increased or decreased, by adjusting the
Weld Control Knob. Adjust -10% to +10%
of factory setting. Press MODE button again
to return to normal operation
5 CONTROLS 145 & 185 POWER SOURCE
Note: Control panel diagram instructions are also suited for Weldarc 145
PANTONE 432 C
WHITE
PANTONE 426 C
PANTONE 116 C
Approved Design
WIN628A
WIN628A
AMPS
STICK
TIG
ON VRD
WIN628A
AMPS
STICK
TIG
ON VRD
2
4.1
6
Power Switch Located on the rear panel 1 3
4.3
4.2
5
4

1312
5.1 CONTROLS 135 POWER SOURCE
Power Switch Located on the rear panel
6
PANTONE 432 C
WHITE
PANTONE 426 C
PANTONE 116 C
Approved Design - WIN678B
FINAL ARTWORK FOR PRINT PROOF
WIN678B
AMPS
20
50
80
110
135
ON VRD
Approved Design - WIN678B
Mock up with knob. Proof only DO NOT PRINT
WIN678B
AMPS
20
50
80
110
135
ON VRD
2 1 3
5
6 Power On/Off Switch
In the OFF position, this switch isolates the
power source from the mains power supply.
The switch is located on the rear panel.
5 Weld Current Control
This control sets the output current level of
the power source within the available range.
Rotate the knob clockwise to increase the
output current.

Weldarc 135, 145, 185 | Operator Manual | Model No MC110-0 / MC111-0 / MC112-0
1514
6 INSTALLATION
Connection to Electrical Mains
Power Supply
The Weldarc 135 & 145 is fitted with a 10 Amp
supply cable and plug.
The Weldarc 185 is fitted with a 15 Amp
supply cable and plug recognisable by a
wide earth pin. Power supply authorities
require that equipment fitted with a 15 Amp
plug shall ONLY be connected to a 240 Volt,
15 Amp power point. DO NOT modify the plug.
The minimum capacity of the main power
supply wiring and power outlet supplying
a welder is selected according to the
Effective Primary Current of the equipment.
Refer to Section 3.
The minimum recommended main power
supply circuit breaker ratings for Weldarc
inverters are listed in Section 3.
If it becomes necessary to replace the
mains flexible supply cable, use only cable
with correct current rating. See Section 3.
If it is necessary to use an extension power
supply cable, ensure that it is rated as per
Section 3. Voltage drop which will occur
over long lengths of cable will reduce the
quality of welds and the maximum welding
current available from the equipment.
As noted previously, it is not recommended
that the Weldarc inverter be powered from
small engine-driven generator sets unless
they have adequate voltage regulation. Poor
regulation results in peaks of supply voltage
which can occur with some equipment
of this type. Excessive voltage peaks
can damage the circuits of the welder.
Machines with PFC will be tolerant of poor
generator voltage regulation.
7 BASIC WELDING INFORMATION
Stick Welding (MMAW)
Connection for Stick Welding
It is important to select the electrode
polarity in accordance with the
manufacturer’s recommendations for
that electrode. Most common electrodes,
including cellulose types, are operated
with the electrode at positive polarity,
as illustrated in Figure 3.
Fig 3 Connections for Stick Welding
(MMAW, Electrode Positive
Stick Welding
Be certain that you are wearing suitable
protective clothing, gloves etc and that
you are working in a non-hazardous area.
If necessary, refer again to Section 1 -
Safe Practices in this manual.
Connect the work clamp to the work
piece. Place the desired electrode in the
electrode holder.
Turn on the power switch located on the
rear panel. Wait approximately 5 seconds
as the unit goes through its initiation
sequence.
+-
(+) Output
Terminal to
Electrode
Holder
(-) Output
Terminal
Work Clamp

1514
For Weldarc 145 & 185 only, use the Weld
Mode Selection Switch to select Stick Mode.
Select an appropriate welding current for
the electrode diameter by setting the knob
on the machine front panel. WIA Austarc
electrodes will give the best results.
To Strike the Arc:
With VRD enabled, touch-twist-lift.
With VRD disabled, drag the end of the
electrode along the work piece as if striking
a match.
As the arc initiates, lift the electrode slightly
away, aiming to establish an arc length of
approximately 3mm.
As the electrode end is consumed, feed
the electrode into the arc in order to
maintain arc length. As a general rule, the
arc should be held as short as possible
while still giving stable burn off and good
weld appearance. An arc which is too long
may cause an unwieldy flow of metal with
a rough weld appearance and reduced
penetration. An arc too short leads to a
narrow weld deposit and “stuttery” arc
characteristics, and the electrode is liable
to freeze onto the work piece.
As the solidified weld deposit forms,
move the end of the electrode slowly
along the weld path, aiming to maintain a
pool of molten weld metal behind the arc.
Decreasing this rate of travel will result in a
wider weld deposit, and similarly increasing
it will narrow the weld deposit.
Always fill the crater which tends to form
at the end of a weld deposit, by pausing
momentarily before withdrawing the
electrode to break the arc. Unfilled craters
are a point of weakness, and can lead to
weld cracking.
TIG Welding (GTAW)
Connection for TIG Welding
(145 & 185 only)
For TIG Welding, the torch is connected
negative terminal. Figure 4 illustrates the
correct connection of the welding torch.
The machine does not have an internal
gas valve, therefore, the gas supply needs
to be controlled externally with a torch that
incorporates a manual valve in the hand
piece. Welding grade Argon is the
shielding gas most commonly used for
DC GTAW welding.
Before first use of the welding torch, allow
gas to purge the torch and hoses for
30 seconds at approximately 10 litres/min.
For welding purposes, the gas flow rate
should be set in the range 2-5 litres/min.
Tungsten electrodes for DC GTAW should
be 1-2% Thoriated. This type will provide
the best arc initiation, arc stability and tip
shape retention characteristics. Thoriated
electrodes can be recognised by a red
coded end. The tungsten electrode is
ground to a point, with the grinding marks
pointing towards the tip. For welding
currents less than 20 amps, the included
angle of the point should be 30o, for currents
greater than 20 amps, the recommended
angle is 60o. When set in the torch, the
tungsten should protrude 6mm from the
ceramic gas nozzle.
Current Range for General Purpose
Electrodes
Diameter (mm) Current (Amps)
2.0 40 - 60
2.5 60 - 85
3.2 90 - 130
4.0 130 - 180

Weldarc 135, 145, 185 | Operator Manual | Model No MC110-0 / MC111-0 / MC112-0
1716
TIG Welding Operation
Connect the Work Clamp to the work piece.
Turn on the power switch located on the
rear panel. Wait approximately 5 seconds
as the unit goes through its initiation
sequence.
Use the Weld Mode Selection Switch to
select TIG Mode.
Select an appropriate welding current for
the job by setting the knob on the machine
front panel.
To initiate the arc, lightly touch the tungsten
electrode onto the work piece, then
smoothly lift it away to establish an arc
length slightly longer than the diameter of
the electrode.
Use of a copper striking plate can be used
to avoid electrode contamination. The
electrode can also be contaminated by
contact with the filler rod. A contaminated
electrode produces an unstable arc. if this
occurs regrind the electrode tip.
Dust
Care should be taken to prevent excessive
build-up of dust and dirt within the welding
power source. It is recommended that
at regular intervals, according to the
prevailing conditions, the equipment
covers be removed and any accumulated
dust be removed by the use of a dry, low
pressure compressed air, or a vacuum
cleaner. The machine should be blown
out with compressed air at least every 12
months as grinding dust can settle on PCB
componentry causing failure. Failure to
maintain machines may void warranty.
Before removing the equipment
cover, ENSURE that the equipment
is disconnected from the mains
power supply. When the equipment
is energised LETHAL VOLTAGES
are present on the electrical
components enclosed.
8 GENERAL MAINTENANCE
If you are in Australia and the
following checks do not identify the
fault condition, the equipment should
be returned to a WIA Service agent.
Phone [phone] for details of
your nearest service agent.
9 EXTERNAL TROUBLE SHOOTING
If you are in New Zealand and the
following checks do not identify
the fault condition, the equipment
should be returned to the original
place of purchase with proof of
purchase, or contact Weldwell on
06 8341 600.
Fig 4 Cable Connections for TIG welding
+-
(-) Output
Terminal
to TIG
Torch
(+) Output
Terminal
Work Clamp

1716
Problem Likely Reason Outcome
All Inverter Multi-Process Models
No welding current, no
display.
The machine is not turned on
at both the mains supply and
the machine power switch.
If confirmed that the machine
is switched on correctly,
test the same outlet using a
known serviceable appliance.
Mains circuit breaker
nuisance tripping during
welding.
Mains circuit breaker
inadequately rated, or duty
cycle exceeded.
The circuit breaker may
be rated for Ieff (effective
current). If Weld output is
greater than the 100% rating
the machine will require mains
current higher than Ieff. The
duty cycle should be observed
and understood.
Machine continually cuts
out on thermal overload
The machine duty cycle has
been exceeded.
Leave the machine energized,
with the fan running until
the machine has cooled
sufficiently.
The duty cycle should be
observed and understood.
No welding current,
display on.
The weld connections may
not be made securely.
Ensure all connections are in
position and securely made.
Machine gives poor
quality weld.
The polarity of the electrode/
return cables is incorrect.
The return lead contacts, or
workbench surface requires
cleaning.
Polarity should be confirmed
for the process/wire type in
use.
The return lead contacts
and connections should be
inspected and cleaned, and
the workbench cleared of
waste materials.
Machine works fine
on mains power
but does not work
when connected to a
generator.
Machine works fine
on mains power but
does not work when
connected with
extension lead.
Generator cannot provide
high peak cycle currents for
inverter.
Extension leads creating
additional resistance, and
voltage drop
Use larger kVA generator or
sometimes a different band
generator will work..
Use larger cable size, and
keep extension lead as short
as possible.
10 TROUBLE SHOOTING CHART

Weldarc 135, 145, 185 | Operator Manual | Model No MC110-0 / MC111-0 / MC112-0
1918
Problem Likely Reason Outcome
MMA/STICK Models
In MMAW (Stick), the arc is
difficult to strike.
The technique required
for VRD enabled welding
machines is not the same as
earlier stick welding units.
The technique to strike
should be reviewed, not as
a ‘strike’ but more as ‘touch,
twist, lift’ motion.
If VRD is not a site
requirement, VRD can be
disabled by service agent .
GTAW/TIG Models
Tungsten burns up on arc
start.
The polarity of the electrode/
return cables is incorrect.
Gas not turned on
Gas flow too low
Not enough Pregas time
Polarity should be confirmed
for the process/wire type in
use
Review gas set up.
The weld has small black
‘lumps’ or ‘dots’ appearing
in the pool. Cleaning is
poor.
Old or dirty filler rods can
often be the cause of ‘dirty’
TIG welding operations.
Switching filler rods to
another type or batch may
solve this issue.
Weld is contaminated with
small bubbles (presence
of porosity).
The gas hose is not securely
connected at the machine or
at the regulator.
Ensure the gas connections
from regulator through to
the torch connection are
sufficiently tightened.
Presence of porosity at
weld start.
The torch gas hose has not
been purged sufficiently.
Purge the system and
confirm sufficient gas flow
through the regulator.

1918
11 SERVICE INFORMATION
The electrical components of the
equipment are shown in the circuit
diagrams on pages 20-22.
The Weldarc inverter is an inverter
type design, where the mains supply is
first rectified, filtered then chopped to
a high frequency before being applied
to the welding transformer. The output
of this transformer is rectified to form
the welding output of the machine.
Before removing the equipment
cover, ENSURE that the equipment
is disconnected from the mains
power supply. When the equipment
is energised LETHAL VOLTAGES
are present on the electrical
components enclosed.
CAUTION: The following information
is intended for use by qualified
service personnel. When the unit
is energised LETHAL VOLTAGES
are present on the electrical and
electronic components. It is not
intended that persons without
suitable training and knowledge
attempt to perform service tasks on
the components of this welder.
If the welding machine requires
service or repair, take the machine
to an authorised service agent.
Australian service agents can
be located on the welding.com.
au website. Alternatively call
customer service; Australian 1300
300 884 New Zealand 0800 9353
9355. When contacting a service
agent please have an accurate
description of the fault, and the
machine serial number located on
the base on the machine.
M1102A..................
M1112A...................
M1122A..................

Weldarc 135, 145, 185 | Operator Manual | Model No MC110-0 / MC111-0 / MC112-0
2120
Fig 5 Weldarc 135 Circuit Diagram
12 CIRCUIT DIAGRAMS – 135 POWER SOURCE
G1
CS+
CS-
E1
G2
E2
G3
E3
G4
E4
U+
U-
HandyArc 142i-162i
1
2
P3
12
3
FAN
FAN 5
2 3 4 1
C N401
L
N
-
~~
+
B D1
*
PTC1
+
C2
+
C3
R LY1
VCC
T3
C5 C6
C10
R2 R3
1G
2C 3
E
Q1
1G
2C
3
E
Q3
R9
C7
R8
C8
G1 G3
E1 E3
2
5 6
1
3 4
T2
A1
K
A2
D1
R 13 C13
A1
K
A2
D3
R 12 C12
R16
C14
C15
DGND
AGND
U+
CN1
U-
CN1
U+
D20
R 14
R15
+
CN1
-
CN1
PE
Earth
1G
2C
3
E
Q2
1G
2C
3
E
Q4
G2 G4
A1
K
A2
D2
A1
K
A2
D4
+
C4
+24V
C67 C68
R107
C70(NO）
CS+ CS-
CHARGE
E2
E4
5 2 3 4 1
P1
HandyArc 142 -162i PANEL
I f
LINE
U f
CTRL
FAN