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Spares for a modular MIG welder and its wire feeder and water cooler, and how to match and fit them safely.
Only a competent person should do it. Welding power sources contain mains voltage and, in inverter designs, capacitors that can hold a charge after the machine is switched off. Switch off, disconnect the mains supply and follow the maker's service instructions for waiting and discharging before touching any internal part.Use a qualified electrician for electrical repairs and testing, and never use damaged or faulty equipment. The HSE has also reported a fatal shock where welding equipment was not switched off. The wait time and discharge method depend on the machine, so check the service manual.
Check the simple things first. Plugged gas ports, a ruptured hose, incorrect flow or a clogged nozzle can all let air into the weld and cause porosity, according to a welding consumables maker's troubleshooting guide. A faulty solenoid is another listed cause.Signs of a failing valve include no gas when the trigger is pulled, gas that will not stop or flow that is weak or irregular. A common check is to confirm gas reaches the torch end, then work back through the hose and fittings to the valve. If the valve is suspect, have it tested and replaced by a competent person, matching the coil voltage and fittings of the original.
Mechanical parts wear far more often than electronics. Worn, wrong-size or badly tensioned drive rolls, a worn or kinked liner and a worn contact tip are frequent causes of erratic feeding, and welding consumable makers advise checking the rolls and tip before the liner, which is more work to replace.If the rolls do not turn at all when the trigger is pulled, look for a fault in the connections, trigger or control leads. Too much roll tension can deform the wire and damage the liner and tip. Only after the mechanical side is ruled out is a feeder card or motor likely to be the cause.
Internal cables and connectors carry control signals and power between cards, so a damaged one can cause intermittent faults that are hard to trace. Look for cracked insulation, bent or burnt pins, loose plugs and signs of overheating.Keep machine terminals and lead connections clean and tight, and never use damaged or faulty equipment. Fit a replacement of the same type and length as the original, seat the connector fully and route the cable away from sharp edges and heat. Disconnect the mains and follow the maker's instructions before opening the unit.
