Dennis,
Postal was correct about the amps/thickness equation. I saw the $$$ difference on the 120 volt machine and the 220 volt machine. It was over $200 clams.
The spec sheet indicates the increased amperage allows you to weld 5/16 plate while the 120 volt machine max's out at 1/4 plate.
I think these values are for single pass welding. You can always do a multi-pass weld and satifactorily join heavier sections.
This is where you look at the intended use of the machine. You are going to be doing thin repair sections with a occasional engine mount or cross member.
1/4" would probably be the thickness-de'jour for a home shop , so your $200 would be better spent somewhere else.
This is where your personality comes into play. Would you rather have some extra oink in the machine for that 'big job', or are you a minimalist.
Stuart
