The aluminum was extremely clean, probably the cleanest I have ever seen. The soot problem only happened on the inside of the 1/2 H shaped joint. It was hard to keep the correct gun angle in there, I'm guessing that was the main factor. I was using a push pull gun. Probably this set up. http://www.m...

I took an aluminum test recently without having much practice and failed. It was both mig and tig. For the mig test I had to weld in a restricted type of joint that resembled a half H shape. Anyone have tips for preventing a sooty weld? It was a flat plate with 3 plates going vertical about 1/8 thic...