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 - Sunday Drives - by Cowboy. Summer was finally upon us here in Northern Maine. We have two types of industry up here, one being "Forestry" (Wood Products) and the other "Farming" (Potatoes). There is no shortage of farm tractors and equipment around here! I have been restoring old Farm Tractors for the past 6 years, and have found it easier and less expensive to hit all the auctions and purchase whole tractors for parts needed. My wife who works at a local school, and only has weekends and summers off, while on t
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