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. Any advice thanked in advance.