Give a shot with the HFT 90. I have the 170 HFT welder (240v) and it does some pretty nice welds. My bro in law has a porsche 928 that he does track events with and I stitched up his exhaust with. I've never heard of filing it with inert shielding gas but I guess it can't hurt. (I use argon when I bother using it at all)
you will know right away if you punch holes in the metal you don't have the proper setting. Then you have to fill or patch. I rarely break out the bottle, I usually just flux core stuff. Just remember, zig zag with flux core so mot to push that garbage in your weld.
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