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 - Usin Your Implements: Bucket Loader - by Curtis Von Fange. Introduction: Dad was raised during the depression years of the thirties. As a kid he worked part time on a farm in Kansas doing many of the manual chores. Some of the more successful farmers of that day had a new time saving device called a tractor. It increased the farm productivity and, in general, made life easier because more work could be done with this 'mechanical beast'. My dad dreamed that some day he would have his own tractor with every implement he could get. When he rea
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