Ok, what is wrong with my stick welder? The unit hums and it seems like the fan is running but when I try to strike an arc, nothing happens. No output. Then when I switch it off there is a pretty noticeable flash inside the case. Is that normal? This is a used welder I picked up to play around with. Any thoughts?
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Thunderbolt 225V
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A long distance diagnosis is always pretty iffy but it sounds as if the secondary is shorted and the big flash you see is the input line breaking contact.
Normally, when a welder is shut off, the current going in is quite small, and no flash results when the circuit is broken.
However, when a circuit is broken which is carring a lot of current, a large flash will result.
Open up the case and look for any place where the output lines could have worn through the insulation.
Good luck.work safe, always wear your safety glasses.
Edward Heimbach
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Re: Thunderbolt 225V
Originally posted by skyboss
Ok, what is wrong with my stick welder? The unit hums and it seems like the fan is running but when I try to strike an arc, nothing happens. No output. Then when I switch it off there is a pretty noticeable flash inside the case. Is that normal? This is a used welder I picked up to play around with. Any thoughts?
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