tips for mig welding aluminium

[LT65]

Use a nylon liner just for the ally. Clean clean clean use a stainless brush only on the ally NOTHING else, the ugly lump is a cold start. Maybe start from the other end LOL.
Perhaps start in from the end to heat the job then come back to the end and go over your cold start , been a while since i've done lots of ally welding but this might help other than a TIG.

[Zedn]

Originally Posted by LT65

Use a nylon liner just for the ally. Clean clean clean use a stainless brush only on the ally NOTHING else, the ugly lump is a cold start. Maybe start from the other end LOL.
Perhaps start in from the end to heat the job then come back to the end and go over your cold start , been a while since i've done lots of ally welding but this might help other than a TIG.

Im not sure if that would overheat doing it that way, but i will give it a try. I have found that it is still penetrating and looks ok when its ground. I am going to be covering my footboxes with Al so the welds will be ground flat any way.

Thanks for the advice everyone.

Liam

[jetsbaby]

I have a Miller 252 mig with the 30A spoolmatic gun...I have great results with the larger wire spool then the .030 and .035 size..The keys to welding aluminum especially thin metal is to cool the puddle down fast which is accomplished with the larger wire..Also use a step and pause technique. All most looks like it when you get it down right..