Nothing will weld dirty aluminum, at least IMHO. Scratch it down to clean and bare with a dedicated SS wire brush, weld it as soon as you get it clean. The MIG can work, but does not do well without a Teflon liner in the gun, and not 4000 series wire (it's too soft) and birds-nests easily. As others have said, keep the gun lead as straight as possible, and use only Argon. I built an 18' aluminum runabout boat out of 1/8 plate, a bunch of extrusions and my Lincoln SP 170T. It was patterned after a Weldcraft Renegade.
I envy Jon's spool gun work on his son's flatbed!! If only................ steve
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Today's Featured Article - Old Time Threshing - by Anthony West. A lovely harvest evening late September 1947, I was a school boy, like all school boys I loved harvest time. The golden corn ripens well and early, the stoking, stacking,.... the drawing in with the tractors and trailers and a few buck rakes thrown in, and possibly a heavy horse. It would be a great day for the collies and the terrier dogs, rats and mice would be at the bottom of the stacks so the dogs, would have a busy time hunting and killing, all the corn was gathered and ricked in what we c
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