The base is 1/8" 6061, the filler was 1/8" 4043. I brushed it pretty good in the areas I welded, enough to produce aluminum dust. I also brushed my filler wire, but not very good as it was hard to do.

I've been slowly teaching myself to TIG aluminum as I think I have MS and SS down. Only issue I am having is this gritty look to my welds. Not sure if its contamination or what? Im using acetone to clean the metal and filler, and a dedicated SS brush. Welder is a Miller Syncrowave 180SD, 100% argon ...