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Thermal Arc Welder 150 GTSW went ''pop''

I was welding some mild steel when my tig welder went pop. Blew the breaker and a puff of smoke. I opened it and found a few resisters had blown. I replaced the Mosfets, Diodes, Resistors and powered it up again. Unfortunately went pop again but different things blew. Does anybody have any suggestions where I can get a schematic or where I should look for the problem? Thanks
jim

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You badly need a service manual, you might be able to get one at the Thermal Arc home page.
Since it blew the input power breaker and let off a bit of smoke we'll take as given that something in there shorted. Inverter welders like this have a rectifier section, then an inverter section, then another rectifier section before the torch. I'd bet a little money that what went pop was one or more of the SCRs in the rectifier section. You really need the manual to do anything useful to this machine, pay particular attention to the repair sections where they talk about cold checks before powering the machine on again, it'll save you hours of replacing parts.

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Carl

Posted on Dec 03, 2008

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