1. Step on the pedal, the welding machine does not work, and the power indicator does not light up:
a. Check whether the power supply voltage is normal; check whether the control system is normal.
b. Check whether the contact of the foot switch, the contact of the AC contactor, and the split shift switch are in good contact or burnt out.
2. The power indicator light is on, and the workpiece is pressed and not welded:
a. Check whether the pedal stroke is in place and whether the foot switch is in good contact.
b. Check whether the pressure rod spring screw is properly adjusted.
3. Undesirable splashes during welding:
a. Check whether the electrode tip is seriously oxidized.
b. Check whether the welding workpiece is seriously corroded and has poor contact.
c. Check whether the adjustment switch is too high.
d. Check whether the electrode pressure is too small and whether the welding procedure is correct.
4. Serious solder joint indentation and extrusion:
a. Check whether the current is too large.
b. Check whether the welding workpiece is uneven.
c. Check whether the electrode pressure is too large, and whether the shape and cross-section of the electrode head are appropriate.
5. Insufficient strength of welding workpiece:
a. Check whether the electrode pressure is too small, and check whether the electrode rod is fastened.
b. Check whether the welding energy is too small, and whether the welding workpiece is seriously corroded, so that the welding point is not in good contact.
c. Check for excess oxide between the electrode tip and the electrode rod, and between the electrode rod and the electrode arm.
d. Check whether the cross section of the electrode tip is increased due to wear and the welding energy is reduced.
e. Check whether the electrode and copper soft joint and joint surface are seriously oxidized.
6. Abnormal sound of AC contactor during welding:
a. Check whether the incoming line voltage of the AC contactor is lower than the self-release voltage of 300 volts during welding.
b. Check whether the power leads are too thin or too long, causing the line voltage drop to be too large.
c. Check whether the network voltage is too low to work properly.
d. Check whether there is a short circuit in the main transformer, causing too much current.
7. Overheating of the welding machine:
a. Check whether the insulation resistance between the electrode holder and the body is poor, causing a local short circuit.
b. Check whether the water inlet pressure, water flow, and water supply temperature are appropriate, and check whether the water system is blocked by dirt, which may cause the electrode arm, electrode rod, and electrode head to overheat due to poor cooling.
c. Check whether the contact surface of the copper flexible coupling, the electrode arm, the electrode rod and the electrode tip is seriously oxidized, resulting in an increase in contact resistance and serious heat generation.
d. Check whether the cross-section of the electrode head is excessively increased due to wear, and the welding machine is overloaded and heated.
e. Check whether the welding thickness and the load duration rate exceed the standard, so that the welding machine is overloaded and heated [1]
