MIG Series
Tapped Gas Shielded Welder
Operation Instructions
(Attention: please carefully read the operation instructions before use)
－1－
Please carefully read these operating instructions before using the welding machine. The operating
procedures recommended in this operating instruction manual must be strictly followed in trail-operation.
I． Main Application and Suitable Scope
MIG series CO2 Gas Shielded Semiautomatic Arc-Welding Machine (hereafter referred to as
“Welding Machine ”) is applicable to CO2 gas shielded welding of sheet metal, mediate plate and
thick plate of various common carbon steel, high grade carbon steel and low alloy steel.
Multi-grade tap welding eliminator supply is adopted in MIG Series Welding Machine. High quality
diode, which is simple in structure, convenient for maintenance, easy to operate, and reliable in
operation, is used as module element. It is the most simple and reliable structure in CO2 gas shielded
welding and MIG welding equipments widely used in many countries at present ;It can be used to
omni-directional CO2 gas shielded (or MIG) welding, which bears the merit of high production
efficiency and quality, low cost, convenient for operation, no welding slag on open arc, high degrees
of welding, minor zone of hot influence when welding, minor work piece distortion, beautiful
shaping in the welding seam etc. comparing with electrode coating welding and submerged arc
welding. It is warmly welcomed by our clients.
Superior static and dynamic characteristics in this series of welding machine ensures the power with
satisfying welding adaptability; broad welding adjustment is suitable for various welding conditions.
It is the ideal equipment for further popularizing the new technique of CO2 gas shielded welding and
can be matched for use with imported high quality welding torch.
The above-mentioned characteristics fully reflects our purpose of providing convenience for users,
Especially for beginner to master CO2 welding technique more quickly.
II． Suitable Working Condition and Environment for the Product
Please carefully read these operation instructions before installing and using the welding machine.
1．Welding machine must be well grounded and it must not be used with the enclosure open.
2．The welding position shall be covered with arc board so as to prevent others from being burned by
the electric arc.
3．The operator must wear work clothes with long sleeves, wear weld cap, and leather gloves. The
cuff and collarband shall also be well bundled.
4．Do not weld under the surrounding with inflammable, explosive articles or flammable gas.
5．There shall be ventilating and dust removal facilities near the welding position, especially in
narrow space. But, the air shall not blow towards the weld zone directly.
6．During wire delivery, the torch mouth shall not face to human body, so that welding wire will not
bring injure to persons in wire delivery.
7．The gas cylinder shall be stably and firmly laid to prevent the cylinder from dumping and injuring
others
8．Do not alow fingersw, hair, clothes etc. to approach rotary positions like the fan and wire feeding
wheel etc.
9．The welding machine shall be maintained and overhauled regularly.
10．Working conditions
The welding machine shall be installed at the place with the environment temperature not
exceeding 40 degrees Centigrade and relative humidity smaller than 90% (±25) ;The installed
place shall not have corrosive gas, moisture, steam chemical sediment, dust, mould, and other
explosive and corrosive medium which seriously influence the insulation of welding machine;
There shall be no serious vibration and toss in the installation place.
－2－
III. Specification and Technical Parameter
Model MIG -210Y MIG -250Y MIG -270Y MIG -350Y MIG -400Y MIG -500Y
Primary voltage(V) 380V/50Hz 380V/50Hz 380V/50Hz 380V/50Hz 380V/50Hz 380V/50Hz
Phase 3 3 3 3 3 3
Rated load
endurance(kVA)
Secondary nonloaded
voltage(V)
Current Adjusting
Range(A)
6.8 8.9 9.4 15.5 20 30
18.0V~30.0 18.0V~32.0 19.5V~34.5 21.5V~37 22V~43 22~52
40~210 40~250 40~270 50~350 65~400 100~500
Wedling voltage(V) 16.5~24.0 16.5~26.5 17~28 17~31.5 17.3~34 17.3~44
Voltage adjusting stages 10 10 10 10 10 10
Rated duty cycle(%) 60% 60% 60% 60% 60% 60%
Rated welding current(A) 200A 250A 270A 350A 400A 500A
Weiht(kg) 70kg 95kg 95kg 110kg 125kg 165 kg
Structural configuration Intergratde Intergratde Intergratde Intergratde Intergratde Intergratde
Suitable welding wire(mm)
φ0.8/1.0 φ0.8/1.0
φ
0.8/1.0/1.2 φ0.8/1.0/1.2 φ0.8/1.0/1.2 φ0.8/1.0/1.2
Model MIG -210Y MIG -250Y MIG -270Y MIG -350Y MIG -400Y MIG -500Y
Primary voltage(V) 380V/50Hz 380V/50Hz 380V/50Hz 380V/50Hz 380V/50Hz 380V/50Hz
Phase 3 3 3 3 3 3
Rated load
endurance(kVA)
Secondary nonloaded
voltage(V)
Current Adjusting
Range(A)
6.8 8.9 9.4 15.5 20 30
18.0V~30.0 18.0V~32.0 19.5V~34.5 21.5V~37 22V~43 22~52
40~210 40~250 40~270 50~350 65~400 100~500
Wedling voltage(V) 16.5~24.0 16.5~26.5 17~28 17~31.5 17.3~34 17.3~44
Voltage adjusting stages 10 10 10 10 10 10
Rated duty cycle(%) 60% 60% 60% 60% 60% 60%
Rated welding current(A) 200A 250A 270A 350A 400A 500A
Weiht(kg) 70kg 95kg 95kg 110kg 125kg 165 kg
Structural configuration Separated Separated Separated Separated Separated Separated
Suitable welding wire(mm)
φ0.8/1.0 φ0.8/1.0
φ
0.8/1.0/1.2 φ0.8/1.0/1.2 φ0.8/1.0/1.2 φ0.8/1.0/1.2
Other parameters
Suitable diameter of the welding wire 0.8-1.6mm
Shape of welding torch Goose neck style
Cooling of welding torch Self-cooling
Hose for wire delivery 3 m
Speed of wire delivery 1-6 m/ min
－3－
Panel Sketch
MIG
-
270Y
Ⅳ．
1．Protection indicator
Tapped Gas Shielded Welder
3．Power switch
4．Voltage switch
5．Power supply indicator
2．current adjustment
V．Systematic Demonstrations
1．Installation and debugging
6．Spot welding
7．Intermittent
8．
Adapter of Welding Torch
9．
Output Ports
regulation
regulation
※ VA welding machine shall be installed at a steady and well-ventilated place. The sunlight shall be
shielded when using outdoor. The forklift shall be used for its transportation so as to keep the
welding machine upright and avoid inverting and inclining. The welding machine shall be
grounded before access to electric wire netting: connect the screw on ground connection symbol
of the welding machine and ground wire of electric wire netting. And then, connect the power
cable of the welding machine to the electric wire netting (be careful that the adapter shall be firm
and reliable).
※ If the welding machine is just accepted or has been left unused for a long time, the insulation
resistance of the welding machine shall be inspected: the electric circuit related to the electric wire
netting, the insulation resistance between the circuit shall be no less than 2-5MΩ ;if the insulation
resistance is lower than the above-mentioned value ,it shall be dried. After the confirmation of
normal welding machine, the welding torch, ground wire, wire feeding machine, barometer, gas
cylinder etc. shall be well connected according to electric assembly drawing: well connect the
CO2 pressure reduction meter (namely, barometer) with the gas cylinder and well connect the air
inlet of barometer and welding machine (wire feeding machine) by φ8 heatproof polyvinyl
chloride hose; connect power supply of heater with the “heating” socket; connect the positive out
pole of the welding machine with the wire feeding machine and negative pole with the work piece
by the ground wire.
※ Inspect the performance of the welding machine after correctly installing machine and testing to
be normal. Pull the wire delivery handle and loosen the wire-pressing wheel, and then switch on
the torch to rotate the “voltage regulating” switch from small grade to higher grade (attention: the
switch is prohibited from rotating during welding operation): the idle voltage shall vary from weak
to strong; and then evenly adjust the “electric current regulation” knob to make sure that the
rotation of wire feeding wheel shall increase at uniform velocity.
2．Operations
1) Check the correctness of connection between work piece and ground wire, welding torch, wire
delivery, gas cylinder, barometer, gas pipe etc. If there are electric current grade of large (small)
scale on the panel, then switch with small current shall be used under voltage grade of 5
－4－
2) Install the wire reel winded with welding wire to the axle of wire feeder, adjust the wire
feeding wheel and contact tip according to the diameter of the welding wire, and deliver the
welding wire into the wire delivery hose and well press the wire feeding wheel.
3) Open power of the welding machine and adjust the switch for “Voltage Regulation” to the
required grade. The current shall be adjusted to the generally proper position (the accurate
position is to be adjusted during welding); as to welding wire of 0.8-1.0mm, the speed of
delivery shall be generally 3-6 meters / min.
4) Select the way of welding according to actual needs: as to the welding of continued slit, the
knobs of “Spot Welding”, “Intermittent Welding” shall be revolved to the bottom; as to
automatic short welding seam (operation stops after welding for a segment), open the
“Intermittent Welding ”knob and adjust the welding time accordingly; as to automatic
intermittent welding, open “Spot Welding”, “Intermittent Welding” knobs and regulate the
corresponding welding time and welding cycle.
5) Open the valve of the gas valve, regulate the gas flow (generally at the scope of 3-15 liters/
min),and check the air-tightness of the gas circuit; press the switch of the torch to see the
whether wire delivery and gas supply is normal or not.
6) Hold the welding torch at the position of 9-12mm from the spray head and keep a angle of
10-20 degrees with welding seam with the torch. The welding seam can be aimed by the
welding wire.
7) Press the switch of the welding torch, move it evenly after the electric arc is fired and adjust
welding norm to match the welding according to actual condition, so that an exquisite welding
seam is obtained. Loosen the welding torch and a welding circulation is finished.
8) Close the gas valve, and loosen the wire-pressing handle of the wire feeding machine after the
completion of welding. Press the switch of the welding torch to release the gas remaining in the
barometer and shut off the power of the welding machine and general power.
Notes:
1) Thee correct adjustment of welding norm is the key step to welding. The welding current can
be adjusted according to the speed of wire delivery. As to the welding wire with the same
specification, the higher the speed, the stronger the current will be.
2) When burning back occurs to the welding wire, regulate arc stopping and potentiometer. The
position for arc stopping to regulate the potentiometer is located at the front panel of separated
machine and mainboard center of the integrated machine
The standard reference data for welding low carbon steel by undergoing CO2 gas shielded welding
with H08Mn2Si welding wire is listed below (as to detailed data, please refer to the table of welding
parameters).
Diameter of Welding
Wire (mm)
Board Thickness (mm) Welding voltage (V) Welding Current (A)
0.8 0.8-2 18-21 80-100
1.0 3-5 21-24 100-140
1.2 4-6 22-26 130-190
VI．Operational Attentions and Maintenance
1. The welding machine shall be operated in accordance with corresponding load duration factor.
2. The metal splashing within the spray head shall be removed timely during continuous operation.
3. Pay attention to the condition of the wire delivery hose. If it is blocked up or worn out by greasy
dirt, the it shall be purged or replaced.
－5－
4. Replace the contact tube and spray head on timely so that the welding torch or welding machine
is not damaged.
5. The greasy dirt or others on the wire feeding wheel and wire tail shall be timely cleaned. and the
wire feeding wheel of which the V groove is seriously worn shall be timely replaced so as to
prevent instable and slipping wire delivery.
6. The lubrication of the reducing gear box of the wire feeding machine shall be checked regularly
and lubricating oil shall be added if necessary.
7. The insulation of various cable shall be checked regularly .If there is damage on insulation, it can
only be used after the recovery of insulation to prevent short circuit or other accidents.
8. Do not knock the welding torch jam on the wire delivery hose. Do not place the welding torch on
the work piece or on the ground in order to avoid accident.
9. The welding machine shall be kept clean. Clean the internal of the welding machine by using dry
air with low pressure.
10. If the welding machine is not used for a long time, the welding wire within the wire delivery
hose shall be pulled out or lubricating oil added to avoid the corrosion of welding wire.
11. The fan shall be checked whether the operation is normal or not before welding and after startup.
VII Points for Safe Operation
(I) Safety Requirements on Welding Environment of the Welder
1. The welding position shall be covered with arc board so as to prevent others from being burned
by the electric arc.
2. The operator must wear work clothes with long sleeves, wear weld cap, and leather gloves. The
cuff and collarband shall also be well bundled.
3. Do not weld under the surrounding with inflammable, explosive articles or flammable gas.
4. The gas cylinder shall be stably and firmly laid to prevent the cylinder from dumping and
injuring others
5. The fingers, hair and clothes shall not approach the rotary part of the fan.
(II) Safety Requirements on Welding Machine
1. The enclosure of the welding machine shall be grounded during operation.
2. The welding machine shall not be posited to the surroundings with harmful and flammable .The
machine body shall be shielded from moist, rain and insolation. It is better to place it under
ventilating, dry environments with less dust.
3. The welding machine shall be maintained usually and the dust within the machine shall be
removed.
4. The welding blowpipe shall connect with the output end "Welding Torch” of the welding torch
and operation end connects the “work piece”.
5. When welding, the flow of protection gas shall be appropriate. Generally, the thicker the
welding wire, the stronger the gas flow .l As to specific operations, it depends on welding
experience.
6. The machine shall be not placed under environments with corrosive gas or other pernicious gas
and inflammable and explosive gas.
VIII．Packing List
MIG Series Host Computer (including wire feeder) One
C02 Welding Torch (goose neck style) One
Ground Wire for Welding One
Pliers for Ground Wire One
Operating Instructions (including certificate of quality, sheet of guarantee) One copy
－6－
MIG -210/250/270/350/400/500 Electric schematic diagram
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