How to maintain the spot welder?

The following article will analyze some common faults of spot welding machines, and list how to eliminate these faults, which will make buyers and sellers contact many problems. In the process of using the spot welding machine, the common faults can be divided into 7 categories, and these faults are presented one by one.
Fault 1: 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 adjusted properly.
Fault 2: The welding machine does not work when the pedal is stepped on, 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 foot switch contacts, AC contactor contacts, and split shift switch are in good contact or are burnt.
Fault 3: Unwanted splashing occurs during welding: a. Check whether the electrode tip is severely oxidized. b. Check whether the welding workpiece is severely corroded and poor contact. c. Check whether the adjustment switch is too high. d. Check whether the electrode pressure is too low and the welding procedure is correct.
Fault 4: The solder joints are indented seriously and have extrudates: 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 electrode tip shape and cross section are appropriate.
Fault 5: Insufficient strength of the welding workpiece: a. Check whether the electrode pressure is too small, and check whether the electrode rod is tight. b. Check whether the welding energy is too small and whether the welding workpiece is severely corroded, which makes the solder joint poor contact. c. Check whether there is too much oxide between the electrode tip and the electrode rod, 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 severely oxidized.

Fault 6: Overheating of the welding machine: a. Check whether the insulation resistance between the electrode holder and the body is bad, 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 causes the electrode arm, electrode rod, and electrode head to overheat due to poor cooling. c. Check the copper flexible joint and the electrode arm, whether the contact surface of the electrode rod and the electrode tip is severely oxidized, which causes the contact resistance to increase and heat seriously. d. Check whether the cross section of the electrode head is excessively increased due to wear, which causes the welding machine to overload and generate heat. e. Check whether the welding thickness and load duration rate exceed the standard, so that the welding machine is overloaded and heats up.
Fault 7: Abnormal sound of AC contactor during welding: a. Check whether the incoming line voltage of AC contactor is lower than its own release voltage of 300V during welding. b. Check whether the power lead is too thin or too long, causing the line voltage drop to be too large. c. Check whether the network voltage is too low for normal operation. d. Check whether there is a short circuit in the main transformer, causing too much current.