Thanks for the quick responses. I will prep more coupons tomorrow and give the suggestions a try. I’ll keep y’all updated.

I have picked back up on the Lincoln electric square wave tig 200 on some 1/8” 6061-T6 aluminum flat bar in a tee orientation. I am struggling to get the pool down into the root. I am following cleaning recommendations Jody put in his aluminum tig videos, holding a tight arc, 3/32 rod and 3/32 4043 ...