Hey Steve, I use a WIA mig with normal gas wire. Now I am definitely not an expert and only self taught.
I am using .9 wire and have my welder set almost on the lowest amperage. It’s a 270 amp welder.
I have some .6 wire and want to try that but I haven’t got .6 feed rollers yet. I won’t tackle any stuff on the outer skins till I have a play with the .6.
Get a sheet of scrap and start on a low wire feed and amperage and check out how it welds. Big blobs means too much wire, not enough amperage. Stop starting means not enough wire feed for the amperage.
Some welders have a chart to help with a starting point. Mine doesn’t so I found this one on the net. It definitely helps.
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You tube has some great videos with tips too. I really want to do a tafe course though.
Everything I have read said use more heat and get the weld done quickly as opposed to low amperage which means you spend more time and actually heat the panel more causing worse warping, which is the opposite to what you would think.
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