Re: MIG welder fault
There's not a lot to go wrong with a basic MIG welder. The very basic 'live torch' types have only one transformer, switched on all the time, and the torch trigger just starts the motor drive and releases the gas mechanically, but it sounds like yours is more sophisticated.
If it's anything like my 'Portamig' unit, there will be a separate control transformer to power the wire feed motor, fan and main relay. This is presumably working if the fan is running, which is a good sign. The contact in the torch trigger should make a circuit which switches on the gas valve, the wire feed motor and the relay which switches the primary of the main transformer. It sounds like none of these are happening, so check the switch in the torch, and its wiring, first. They have a pretty tough life and the cables get damaged.
Chris
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