View Full Version : 3 phase welder on rotary convert
02-21-2006, 03:39 PM
I have a chance to buy a big LINDE welder with MIG attachment. The Mig is standalone and can be mounted on a boom or left on top of the box. This is a transformer unit, not one of the new electronic things. I can get it cheap but it's 3 phase. I have 3phase on a rotary converter but seems like I remember hearing that you can't run a welder on a rotary converter?????
02-21-2006, 03:58 PM
Kerry, I've seen it done. I bought a lathe from an old guy who was running a big Miller mig welder on a home made 3 phase converter. He had a small 110 vac motor mounted an a hinge arrangement. The small motor had a rubber caster mounted on the shaft. He would start the small motor and then push the caster against the shaft of the 3 phase idler motor then he'd start the welder. It worked great for him.
02-21-2006, 04:49 PM
Kerry I ran a miller 3phase on a converter for several years, no problems. Todd
02-21-2006, 06:26 PM
I'm in a similar situation. Is there a rule of thumb for horsepower vs welder size?
02-22-2006, 06:52 PM
To size a converter, I think you could look at maximum amperage draw of the welder and size the converter for the same amperage motor. Maximum motor amperage is pretty easy to find in spec-sheets. Or call the converter maker. If I remember right mine has a maximum amperage draw sticker inside the box with the capaciters.
02-23-2006, 05:37 AM
The guy called me back yesterday and offered me the converter for $200 bucks. It's a 'store bought' unit and he think's its a 20hp. It was specifically for running the welder. I'll probably get it and the welder.
02-23-2006, 10:50 PM
That sounds like a heck of a bargain. Snap it up!
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