[Moved]: wsm-200 china tig welder

dick_freebird said:

I'd begin by trying to find the schematics, from Google
or perhaps the manufacturer's support pages (if they
are a solid outfit, there should be documentation - I
even got this stuff for my Everlast eBay cheapo combo
(tig / stick / plasma) machine, so anyone up-market
ought to be able to give you service manuals). The
schematic and/or BOM ought to give you the proper
part numbers.

Replacing IGBT with IGBT seems sensible. Replacing
a FET with IGBT, there are many variables to be met
and I'm not so optimistic. You need to know what
you're looking at.

Now 2.6V on the gate seems a bit short to me. You
ought to be considering why the FETs all blew out,
it may not have much to do with the FETs. I have
run across some 'boards where weaknesses of these
inverter type welding machines are discussed, do not
recall the address but do recall vaguely some discussions
about similar issues and that it was "something besides"
that was to blame.

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