Still having the same issue. Aluminum is very clean, AHP Alphatig 200DX, A/C balance 35 - 40, Frequency 75 - 100, 20 CFH argon, 2% Lanthanated or 2% Thoriated, 2% Ceriated 3/32. Same results. See attached pic.

Thanks for the answers to my question. I forgot to mention I am using a #7 gas lens, A/C balance 35%. Changed the argon and the difference was immediate.

I have been trying different tungsten for aluminum welding. 2% lantanated, 2% ceriated, 2% thoriated. 2% thoriated has always been the go to, however after welding for a few minutes the tungsten does not keep the shiny ball end, instead it seems to split and appears contaminated. The aluminum is ver...