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 - New Hitches For Your Old Tractor - by Chris Pratt. For this article, we are going to make the irrational and unlikely assumption that you purchased an older tractor that is in tip top shape and needs no immediate repairs other than an oil change and a good bath. To the newcomer planning to restore the machine, this means you have everything you need for the moment (something to sit in the shop and just look at for awhile while you read the books). To the newcomer that wants to get out and use the machine for field work, you may have already hit a major roadblock. That is the dreaded "proprietary hitch". With the exception of the
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