MIG is relatively clean and fast - and the easiest to learn for welding steel IMO.
TIG is the cleanest and most versatile with a slight welding speed disadvantage.
I have been MIG'ing and TIG'ing structural aluminum (6061) for the past 5 years and I can say that for fillet welds on thicker material (1/8"+) MIG does fine but the learning curve is substantial. It took about 8 months for me to be able to lay down a good quality, good looking MIG weld consistently - and I purchased a top of the line, industrial sized, dual gun Miller MIG and I have more than adequate training and experience. If everything is right it is possible to lay down a brite, shiny fillet weld with very limited spatter, but there is always some and the starts are ALWAYS cold with the MIG. MIG sucks for butt joints in this aluminum - period - it sucks. If you are considering welding aluminum, consider TIG.
....sorry - I am just bored, guys.
PMINMO -
Did you select your machine yet????
Scott
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