Author Topic: MIG Welder, what to look for?  (Read 7346 times)

BruceM

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Re: MIG Welder, what to look for?
« Reply #30 on: May 18, 2019, 04:01:48 PM »
Thanks Glort, they will be relatively small values and not high enough current for welding.  a 3000 watt inverter with 230vac output will have filtering chokes for 15-30 amps. The needed 150amp or better for a 24vdc welder is going to make for big wire and a big core.  Expensive commercially because of size and weight in electrical steel and copper.  Since there will be a strong stray magentic field from an E-I core, with changes in current, I'll stick to the tedious gapped toroid, wound in two layers for better self cancelling.  If I ordered one to be made, I'd be out near $1000.  I can make it with a surplus core for about $70 worth of copper. I might be able to get a puny 250 uh without saturation at 150a.

I have doubts about the project- no telling if the welding fumes will be more than I can handle, or if the variations in welding current which the researcher noted are rapid and will cause substantial AC magnetic field.  I hate failed expensive projects, though often much more is learned.