well if twaz me i go the biggest i could find that will run on house mains240v, you can never have to much power,and there also better in the low range, but this all depends the thickness of the metal ur gonna try and weld with, look for somfin in the 150-180 amps that be nice home welder size.. you thinking of gas ? or fluxed wire gassless.....but you end up using it on all sorts jobs NOT just for SAMMIO....
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