Welldo IGBT Series User manual

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OWNER'S MANUAL
IGBT SERIES
MIG/MAG-YN

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CONTENTS
1. Safety…………………..………………..…………………...…..…….…...……….............................................................
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2. General Description ...………....……...……………….………...….……...……………............................................
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3. Main Parameter..….........…….....……………………………..…….…………………..…...........................................
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4. Installation and Structure.……….….………………………………………………………………….…………………
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5. Operation ……………........….................…..……….………...................................................................................
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6. Welding parameters table ...............………………….………………………………………….……………………
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7. Caution………………..……...…..……….…..………………….….…………................................................................
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8. Maintenance……………………………………………...........................................................................................
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9. Daily checking……………………………………………........................................................................................
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This welding machine for industrial and professional use is in conformity with IEC974
International Safety Standard.
Hereby we state that we provide one year of guarantee for this welding machine since the
date of purchase.
Please read and understand this instruction manual carefully before the installation and
operation of this machine.
The contents of this manual may be revised without prior notice.

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1.SAFETY
Welding and cutting is dangerous to the operator, people in or near the working area, and the surrounding,
if the machine is not correctly operated. Therefore, the performance of welding/cutting must only be under
the strict and comprehensive observance of all relevant safety regulations. Please read and understand this
instruction manual carefully before the installation and operation.
2. GENERAL DESCRIPTION
·The switching of function modes is possibly damaging to the
machine, while the welding operation is performed.
·Do disconnect the electrode-holder cable with the machine,
before the performance of welding.
·A safety switch is necessary to prevent the machine from
electric leakage.
·Welding tools should be of high quality.
·Operators should be qualified.
ELECTRIC SHOCK: IT COULD BE FATAL!
·Connect the earth cable according to standard regulation.
·Avoid all contact with live electrical parts of the welding circuit,
electrodes and wires with bare hands. It is necessary for the
operator to wear dry welding gloves while he performs the
welding task.
·The operator should keep the working piece insulating from
himself/herself.
SMOKE AND GAS GENERATED WHILE WELDING OR
CUTTING: HARMFUL TO PEOPLE’S HEALTH.
·Avoid breathing the smoke and gas generated while welding or
cutting.
·Keep the working area well ventilated.
ARC RAYS: HARMFUL TO PEOPLE’S EYES AND SKIN.
·Wear welding helmet, anti-radiation glass and work clothes
while the welding operation is performed.
·Measures also should be taken to protect people in or near the
working area.
FIRE HAZARD
·The welding splash may cause fire, thus remove flammable
material away from the working place.
·Have a fire extinguisher nearby and have a trained person ready
to use it.

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2.GENERAL DESCRIPTION
This welding machine is composed of the inverter MIG welder power supply with invariable voltage output
external characteristics manufactured with advanced IGBT inverter technology designed by our company.
With high-power component IGBT, the inverter converts the DC voltage, which is rectified from input
50Hz/60Hz AC voltage, to high frequency 20KHz AC voltage; as a consequence, the voltage is transformed
and rectified. The features of this machine are as follows:
●IGBT inverter technology, current control, high quality, stable performance;
●Closed feedback circuit, invariable voltage output, great ability of balance voltage up to ± 15%;
●Electron reactor control, stable welding, little splash, deep molten pool, excellent welding bead shaping;
●Fit for welding the thin plate which over 0.8mm
●Slow wire feeding during arc starting, remove the melting ball after welding，reliable arc starting;
●Small volume, light weight, simple operation, economical and practical.
Block Diagram
INPUT
CONTROL

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3. MAIN PARAMETER
Model
(MIG 250A)
(MIG 300A)
Power supply voltage (V)
3-phase
220V15%
Input current (A) Imax
17
20
Power supply capacity (KVA)
8.3
12
Current adjustment range
(A)
60-250
60-300
Output voltage (V)
15-26.5
15-29
Rated duty cycle (%)
52-56
52-56
Current adjustment range
(A)
60
Power factor
0.93
Efficiency (%)
85
Wire feeder type
integrated
Water-cooled
NO
Post-flow time (s)
1-2S
Welding wire diameter
(mm)
0.8\1.0\1.2
0.8\1.0\1.2\1.6
Insulation class
F
Protection class
IP21
Workpiece thickness (mm)
≥0.8
Machine dimension(mm)
875*420*807
Package dimension(mm)
990*650*1010