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[Bduck]

   Is that all on aluminum ?  Was wondering if that was Tig or Mig.    Me, I took  about half a welding course way back in Georgia at Valdosta Tech in 1998.  Never made it to the Tig type, was only medium fair at Mig and my stick arch welds, well it's amazing how good they looked (after alot of slag chipping and finish grinding)  they were B.S.U welds   (big, strong, ugly)   
 

This is an aluminum boat. The welding used was TIG, I use a Lincoln 225 arc welder that I have had for 30yrs. It does it job for the common metal used but it leaves slag behind and my welds are UGLY sometimes. I'm learning about the different grades of aluminum. The angles I used is from grade 5052 which is same for a lot of boats built. It is easy to bend this grade depending its thickness and the type metal brake used, I use 1/8" and bend with the grain not against it. Another grade that is used is 6061 which this grade is sold at Home Depot or Lowes, this is a tougher grade for bending but can be done using a torch to heat the metal again depending thickness. I have some 6061 flat stock from HD that is 1"x1/8" thick. I tried bending this in my vise and it broke at the bend. Putting a torch to it heating it not quite to its melting point allows a better bend to form at 90º.