I just bought a Hobart 100 welder as a repair project. It allegedly has a faulty wire-feed mechanism, but I haven’t yet confirmed this, and I couldn’t find a loose spool of welding wire today to test it. Is there any reason why I shouldn’t use ordinary copper or steel wire of the right diameter, provided I don’t actually try to weld with it?
No problem if its the right size. Is the wire feed motor turning?
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I’ll find out tomorrow. I put it on hold today after I couldn’t find any flux-core wire at MakeICT.
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This repair was a piece of cake: a connector had come loose from the PCB. 
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