In article ,
"mongke" wrote:

Finally I got hold of an arc welder. It has of course wiring for both 110v
and 220v. Now there is some advantage to use one or the other? I can get
up to 50 amps for 110v. I have also 208v 3 wire 3 phase. Can one get
(almost) 220v from there? I assume not as it would be two phases and not
one phase + neutral.

208 is not 220. So use the 110 hookup. Connecting 208 to 220 equipment
is usually a recipe for unpleasantness, up to and including magic smoke
release. If you keep an eye out, you might well find a good deal of (and
on) 208V 3 phase equipment, which is designed for that voltage and hard
to sell on the used/hobby market since many home/hobby shops (and some
commercial shops) do not have access to 3 phase.

If you have a choice of 110 or 220, use the 220.

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