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4. There is a marked grounding screw in the rear of the welder.
If the material is over 1/4” thick it must be cable
grounded to prevent from static electricity and leaking.
5. If welding time is exceeded duty cycle is limited, welding machine will stop working for protection. Because
machine is overheated, temperature control switch is i
n “ON” position and the indicator light is red. In this
situation, you don’t have to pull the plug, in order to let the fan cool the machine. When the indicator light is off,
and the temperature goes down to the standard range, it can weld again.
Troubleshooting
Fittings, welding materials, environmental factors, power supply may have something to do with welding. User must try
to improve welding environment.
A. Black welding spot
Welding spot is not prevented from oxidizing. User may check as follows:
1. Make sure the valve or argon cylinder is opened and its pressure is enough. Argon cylinder pressure must
be above 0.5Mpa.
2. Check if the flow meter is opened and has enough flow. User can choose different flow according to
welding current in order to save gas. But too small flow may cause black welding spot because
preventative gas is too short to cover welding spot. We suggest that flow of argon must be kept minimum
1gal/min.
3. Check if torch is blocked.
4. If gas circuit is not air-tight or gas is not pure, welding quality is compromised.
5. If air is flowing powerfully in welding environment, that can lower welding quality.
B. Arc-striking is difficult and easy to pause
1. Make sure quality of tungsten electrode is high.
2. Grind end of the tungsten electrode to taper. If user does not grind tungsten electrode it will be difficult to
strike arc and cause unstable arc.
C. Output current not to rated value
When power voltage departs from the rated value, it will make the output current differ with the rated value.
When voltage is lower than rated value, the max output may be lower than rated value.
D.
Current is not stabilizing when machine is being operated
1. Electric wire net voltage has been changed.
2. There is harmful interference from electric wire net or other equipment.
E.
When using MMA welding there is too much spatter
1.
Maybe current is too big and stick’s diameter is too small.
2. Output terminal polarity connection is wrong, the stick should be connected with the negative polarity of
power source, and work piece should be connected with the positive polarity. Change polarity.
Maintenance
CAUTION! Before maintenance and checking power must be turned off. Before opening the housing be sure to
unplug machine.
1. Remove dust regularly with dry and clean compressed air. If welding machine is in a polluted environment
remove dust daily.
2. Pressure of compressed air must be reasonable in order to prevent damage to small components of the inner
machine.
3. Check the inner circuit of welding machine regularly. Make sure cable circuit is connected correctly and
connectors are connected tightly. If found loose give them a good polish and connect them again tightly.
4. Avoid water and steam from entering machine. If machine happens to get wet dry and check insulation of
machine.
5. If welding machine will not be operated long term store in a packing box in a dry environment.
Before Checking
WARNING! Blind experiment and careless repair may lead to more problems and will make formal check and
repair more difficult. When the machine is electrified the bare parts contain life threatening voltage. Any direct
and indirect touch will cause electric shock. Severe electric shock will lead to death.
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