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Is there a relay that could be bad, keeping the wire energized even if the trigger isn't engaged?Is there a relay that could be bad, keeping the wire energized even if the trigger isn't engaged?
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A great many older home mig welders were produced with a live torch, ie. the manufacturer had saved the cost of the contactor, the high current electromechanical relay that switches the welding current on or off in response to the torch trigger...
It was inevitable some manufacturers would replace the rectifiers and contactor with thyristors (SCRs) and obtain both functions from a single modification.
The trigger switch controls the wire motor and the contactor so if the wire motor is working ok it is unlikely the fault is there and if your welder has a contactor it could be stuck or a wiring fault has caused the coil to be permanently energised or if your welder uses the solid state version, either one or more of the thyristors have failed or a circuit fault has caused the supply to the gate to be permanent causing them to be permanently switched on.
Assuming the Trig Stuk is a message on a display tells me you have a later model welder. Try downloading the manual from Miller. Or if you're adventurous look at the trigger and see if it is stuck, take it apart, clear any debris blocking the trigger contact (preventing it from opening after the trigger is released). Check for cut or twisted wires and see if they are connected at the wire feed motor or has one come off? Is a piece of weld wire touching the motor feed connections?
Is there a relay that could be bad, keeping the wire energized even if the trigger isn't engaged?
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