Clarke MIG120 MULTI Instruction Manual

OPERATION & MAINTENANCE
INSTRUCTIONS
ORIGINAL INSTRUCTIONS GC0722
MIG/MMA/TIG INVERTER WELDER
MODEL NO: MIG120 MULTI
PART NO: 6015601

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INTRODUCTION
Thank you for purchasing this CLARKE Welder. Before attempting to operate
the machine it is essential that you read this manual thoroughly and carefully
follow all instructions given. In doing so you will ensure the safety of yourself
and that of others around you, and you can also look forward to the welder
giving you long and satisfactory service.
When unpacking, any damage or deficiency should be reported to your
CLARKE dealer immediately.
SPECIFICATIONS
NOTE: The details and specifications contained herein, are correct at the
time of going to print. However, CLARKE International reserve the
right to change specifications at any time without prior notice.
MIG120 Multi
Unpacked Weight (kg) 6.8
Dimensions (l x w x h) (mm) 305 x 155 x 233
Power Supply 230V~ 50Hz
Connecting plugs BS1363 (13A)
Max Input Power 3.9 KW
Max Input Current 17.3A
No Load Voltage 63V
Output Welding Current MIG 20A/15V -120A/20v
MMA 20A/18.8V - 100A/24V
TIG 20A/10.8V - 100A/14V
IP Rating IP21S
Insulation Grade Class 1 - Grade H
Suitable Electrode size 1.6-3.2mm
Welding Wire size 0.6mm, 0.8mm, 0.9mm & 1.0mm (flux cored)
0.6mm, 0.8mm (solid)
Welding Capacity (Mild Steel) 1-5 mm (MIG)
1.5-4.5 (MMA)

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PRINCIPLES OF THE MACHINE
The MIG120 Multi is an inverter type welding machine, suitable to carry out
Gas and No Gas CO2welding, MMA, TIG and MIG (MAG -USA welding). The
welder is mainly used for CO2gas protected welding which has the
advantages of high energy efficiency, strong arc penetration and small
welding deformation.
Weldable materials include low carbon steel, low alloy steel, high strength
steel, stainless steel and aluminium alloy. Methods include full position spot
welding, butt welding, fillet welding and lap welding. The stable welding
process can be obtained by using pure CO2, CO2+Ar, CO2+ O2and other
protective gases. The torch is suitable for wire diameters of 0.6-1.0mm.
Manual Metal Arc (MMA) welding uses a coated consumable electrode
(stick) to lay the weld, therefore an additional welding torch kit is not used. The
arc melts the core of the electrode to produce drops of molten metal (weld
pool) that cool to create the welded joint. Because of the versatility and
simplicity of MMA welding, it requires less skill and is used primarily to weld iron
and steel (including stainless steel. but nickel and copper can also be welded
using this method.
MIG (Metal Inert Gas) welding allows you to fuse together two similar metals
without altering the properties of the metal.
A consumable wire electrode is continuously fed through the welding torch
fitted with a concentric gas nozzle. the wire is connected to a high voltage
supply which creates an electric arc between the electrode (the wire) and
the workpiece. The arc is used to create the required heat to turn the metal
into a molten state. The wire is used as both the electrode and as a filler.
The gas is used to prevent oxidation and to shield the arc and the weld from
atmospheric contamination. The choice of gas is dependent upon the
material being welded. This machine is designed to be used for both metal
ARC (MMA) and TIG welding.
(TIG welding leads are not supplied with the machine. These are however,
readily available from your CLARKE dealer (Part number 6012233).
A wide selection of accessories and consumables are available from your
CLARKE dealer (see page 36)

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SUITABILITY OF DIFFERENT METHODS
When using the welder in a gasless configuration the shielding gas is created
from the flux within the welding wire.
When using the welder outside you may need to erect a wind break to make
sure the shielding gas is not blown away, thereby leaving a poor quality weld.
ENVIRONMENTAL RECYCLING POLICY
Through purchase of this product, the customer is taking on the
obligation to deal with the WEEE in accordance with the WEEE
regulations in relation to the treatment, recycling & recovery and
environmentally sound disposal of the WEEE.
In effect, this means that this product must not be disposed of with general
household waste. It must be disposed of according to the laws governing
Waste Electrical and Electronic Equipment (WEEE) at a recognised disposal
facility.
If disposing of this product or any damaged components, do not dispose of
with general waste. This product contains valuable raw materials. Metal
products should be taken to your local civic amenity site for recycling of metal
products.
MMA/Arc Welding Carbon Steel, Low Alloy Steel, Stainless Steel, Cast
Iron.
MIG Welding Carbon Steel, Mild Steel, Stainless Steel
TIG Welding Carbon Steel, Low Alloy Steel, Stainless Steel, Cast
Iron, Titanium, Copper + Brass.
Metal Being Welded Suitable Gas Part number
Mild Steel Carbon Dioxide (CO2) 6000642
Stainless Steel Argon 6000663
Aluminium
Thin Sheet Metal/Mild
Steel
Carbon Dioxide (CO2)/Argon Mix 6000662

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SAFETY PRECAUTIONS FOR ALL TYPES OF WELDING
FAILURE TO FOLLOW THESE RULES MAY RESULT IN SERIOUS PERSONAL INJURY.
GENERAL PRECAUTIONS
BURN PREVENTION
Wear protective clothing - gauntlet gloves designed for use in welding, apron,
and protective shoes. Button shirt collar and pocket flaps and wear cuffless
trousers to avoid entry of sparks and slag. Wear helmet with safety goggles or
glasses with side shields underneath, appropriate filter lenses or plates
(protected by clear glass). This is a MUST for welding (and chipping) to protect
the eyes from radiant energy and spatter. Replace cover glass when broken,
pitted, or spattered. Avoid oily or greasy clothing. A spark may ignite them. Hot
metal should never be handled without gloves. First aid facilities and a
qualified first aid person should be available unless medical facilities are close
by for immediate treatment of flash burns of the eyes and skin burns. A hard
hat should be worn when others work overhead. Flammable hair preparations
should not be used by persons intending to weld or cut.
NOTE: ALL protective wear incl. masks & head shields MUST comply with
PPE Regulation (EU) 2016/425.
TOXIC FUME PREVENTION
Severe discomfort, illness or death can result from fumes, vapours, heat, or
oxygen enrichment or depletion that welding (or cutting) may produce.
Prevent them with adequate ventilation. NEVER ventilate with oxygen. Lead-,
cadmium-, zinc-, mercury- and beryllium-, bearing 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 toxic 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 force 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 other lung and eye irritating by-products. The ultraviolet
(radiant) energy of the arc can also decompose trichloroethylene and
perchloroethylene vapours to form phosgene. DO NOT WELD where solvent
WARNING: AS WITH ALL MACHINERY, THERE ARE CERTAIN HAZARDS
INVOLVED WITH THEIR OPERATION AND USE. EXERCISING RESPECT AND
CAUTION WILL CONSIDERABLY LESSEN THE RISK OF PERSONAL INJURY.
HOWEVER, IF NORMAL SAFETY PRECAUTIONS ARE OVERLOOKED, OR
IGNORED, PERSONAL INJURY TO THE OPERATOR MAY RESULT.

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vapours can be drawn into the welding atmosphere or where the radiant
energy can penetrate to atmospheres containing even minute amounts of
trichloroethylene or perchloroethylene.
FIRE AND EXPLOSION PREVENTION
Causes of fire and explosion are:
1. Combustibles reached by the arc, flying sparks, hot slag or heated
material;
2. Short circuits.
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 goggled operator.
To prevent fires and explosion: keep equipment clean and operable, free of
oil, grease, and (in electrical parts) of metallic particles that can cause short
circuits. If combustibles are in the area, DO NOT weld. Move the work if
practicable, to an area free of combustibles.
Avoid working in paint spray rooms, dip tanks, storage areas, ventilators. If the
work cannot be moved, move combustibles away from sparks and heat; or
protect against ignition with suitable fire-resistant covers or shields.
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 (including building construction) are within 10m.
2. Appreciable combustibles are further than 10m, but can be ignited by
sparks.
3. Openings (concealed or visible) in floors or walls can expose combustibles
to sparks.
4. Combustibles adjacent to walls, ceilings, roofs or metal partitions can be
ignited by radiant or conducted heat.
After work, check that area is free of sparks, glowing embers and flames. An
empty container that held combustibles or that can produce flammable or
toxic vapours when heated, must never be welded on or cut, unless the
container has first been cleaned. 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.
Water filling just below the 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

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weld or cut. Hollow castings or containers must be vented before welding as
they can explode.
In explosive atmospheres, NEVER weld or cut where the air may contain
flammable dust, gas, or liquid vapours.
DO NOT overload arc welding equipment. It may overheat cables and cause
a fire. Loose cable connections may overheat or flash and cause a fire. NEVER
strike an arc on a cylinder or other pressure vessel. It creates a brittle area that
can cause a violent rupture or lead to such a rupture later under rough
handling.
ELECTRIC ARC WELDING
Comply with precautions in above and this section. Arc welding, properly
done, is a safe process but a careless operator invites trouble. The equipment
carries high currents at significant voltages. The arc is very bright and hot.
Sparks fly, fumes rise, ultraviolet and infrared energy radiates and work pieces
are hot. The wise operator avoids unnecessary risks and protects himself and
others from accidents.
BURN PROTECTION
The welding arc is intense and visibly bright. It’s radiation can damage eyes,
penetrate lightweight clothing, reflect from light coloured surfaces and burn
the skin and eyes. Skin burns resemble acute sunburn, those from gas -
shielded arcs are more severe and painful.
PROTECTIVE CLOTHING (PPE) MUST BE WORN
Wear long sleeved clothing (particularly for gas shielded arc) in addition to
gloves, apron and strong shoes. As necessary, use additional protective
clothing such as leather jacket or sleeves, flameproof apron, and fire-resistant
leggings. Avoid outer garments of untreated cotton. Bare skin protection:
Wear dark substantial clothing, Button collars closed to protect the chest and
neck and button any pockets to prevent entry of sparks.
EYE AND HEAD PROTECTION
Protect eyes from exposure to arc. NEVER look at an electric arc without
protection. Welding helmet or shield containing an appropriate filter plate
(Please refer to the section ‘Welding Shield on page 12). 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 pass through to
cause burns.
Cracked, broken, or loose filter plates must be replaced IMMEDIATELY.
Replace clear cover plate when broken, pitted, or spattered. WE SUGGEST
you wear flash goggles with side shields under the helmet, to give some
protection to the eyes should the helmet not be lowered over the face before

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an arc is struck. Looking at an arc momentarily with unprotected eyes
(particularly high intensity gas-shielded arc) can cause a retinal burn that may
leave a permanent dark area in the field of vision. Before welding whilst
wearing contact lenses, seek advice from your optician.
PROTECTION OF NEARBY PERSONNEL
For production welding, a separate, well vented room or enclosed bay is best.
In open areas, surround the operation with low reflective, non- combustible
screens or panels. Allow for free air circulation, particularly at floor level.
Provide face shields for all persons who will be looking directly at the weld.
Others working in the area should wear flash goggles. Before starting to weld,
make sure that screen or bay doors are closed.
SHOCK PREVENTION
Exposed live conductors or other bare metal in the welding circuit, or in
unearthed, electrically-LIVE equipment can fatally shock a person whose
body becomes a conductor. DO NOT STAND, SIT, LIE, LEAN ON, OR TOUCH a
wet surface when welding without suitable protection.
PROTECTION FOR WEARERS OF ELECTRONIC LIFE SUPPORT DEVICES
(PACEMAKERS)
Magnetic fields from high currents can affect pacemaker operation. Persons
wearing pacemakers should consult with their doctor before going near arc
welding or spot welding operations.
PROTECTION AGAINST SHOCK
Keep your body and clothing dry. NEVER work in damp area without
adequate insulation against electric shock. Stay on a dry duckboard or rubber
mat when dampness or sweat can not be avoided. Sweat, sea water, or
moisture between body and an electrically LIVE part - or earthed metal -
reduces the body surface electrical resistance, enabling dangerous and
possibly lethal currents to flow through the body.
EARTHING THE EQUIPMENT
When arc welding equipment is earthed according to the National Electrical
Code and the workpiece is earthed, a voltage may exist between the
electrode and any conducting object.
Examples of conducting objects include, but are not limited to, buildings,
electrical tools, work benches, welding power source cases, workpieces, etc.
NEVER touch the electrode and any metal object unless the welding power
source is off. When installing, connect the frames of each unit such as welding
power source, control, work table, and water circulator to the building earth.
Conductors must be adequate to carry earth currents safely. Equipment
made electrically live by stray current may shock, possibly fatally. DO NOT
EARTH to electrical conduit or to a pipe carrying ANY gas or a flammable
liquid such as oil or fuel.

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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.
TERMINALS AND OTHER EXPOSED PARTS
Terminals and other exposed parts of electrical units should have insulating
covers secured before operation.
SAFETY DEVICES
Safety devices such as interlocks and circuit breakers should not be
disconnected or shunted out. Before installation, inspection, or service of
equipment, shut off all power and remove line fuses (or lock or red-tag
switches) to prevent accidental turning ON of power. DO NOT open power
circuit or change polarity while welding. If, in an emergency, it must be
disconnected, guard against shock burns, or flash from switch arcing. Always
shut OFF and disconnect all power to equipment. A power disconnect switch
must be available near the welding power source.
PREPARATION OF THE WORKING AREA
The working area must be sufficiently spacious, not humid, and well-ventilated
as to avoid any fumes which develop from the welding process and from
incidental material adhering to the pieces to be welded (oils, paints, tars...)
which may cause danger to the operator.
Avoid welding tanks which may contain flammable residuals.
WARNING: ELECTRIC SHOCK CAN BE FATAL. A PERSON QUALIFIED IN FIRST
AID SHOULD ALWAYS BE PRESENT IN THE WORKING AREA. IF PERSON IS
UNCONSCIOUS AND ELECTRIC SHOCK IS SUSPECTED, DO NOT TOUCH
THE PERSON IF HE OR SHE IS IN CONTACT WITH THE WELDER OR CABLES.
DISCONNECT THE WELDER FROM THE POWER SOURCE AND THEN USE FIRST
AID. DRY WOOD OR OTHER INSULATING MATERIAL CAN BE USED TO
MOVE CABLES, IF NECESSARY, AWAY FROM THE PERSON.

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ADDITIONAL PRECAUTIONS FOR MMA WELDING
1. ALWAYS ensure that there is full free air circulating around the outer casing
of the machine and that the louvres are unobstructed.
2. A welding arc can seriously damage your eyes. Both operator and
spectators must ALWAYS use a proper welding face shield or helmet with
suitable filter lenses. Proper gloves and working clothes should be worn at
all times.
3. ALWAYS remove all flammable materials from the welding area.
4. NEVER remove any of the panels unless the machine is disconnected from
the supply and never use the machine with any of the panels removed.
5. NEVER use or store in a damp environment. DO NOT EXPOSE TO RAIN.
6. NEVER attempt any electrical or mechanical repair unless your are a
qualified technician. If you have a problem with the machine contact your
local CLARKE dealer.
7. ALWAYS keep a fire extinguisher handy (Dry Powder, C02or BCF, NOT
Water).
8. NEVER continue to weld, if, at any time, you feel even the smallest electric
shock. Stop welding IMMEDIATELY and DO NOT attempt to use the machine
until the fault is diagnosed and corrected.
9. NEVER allow the earth cable or torch to become wrapped around the
operator or any person in the vicinity.
A comprehensive range of CLARKE safety equipment for use when welding is
available from your local dealer. See page 37.
Consideration should be given to shielding the supply cable of permanently
installed welding equipment, in metallic conduit or equivalent. Shielding
should be electrically continuous throughout its length.
The shielding should be connected to the welding power source so that good
electrical contact is maintained between the conduit and the welding power
source enclosure.
The welding equipment should be routinely maintained according to the
manufacturer’s recommendations (see page 33). All access and service doors
and covers should be closed and properly fastened when the welding
equipment is in operation. The welding equipment should not be modified in
any way except for those changes and adjustments covered in the
manufacturer’s instructions. In particular, the spark gaps of arc striking and
stabilizing devices should be adjusted and maintained according to the
manufacturers recommendations.