Im having this problem and I dont know whats causing it. When I start to tig AL its black and has small pits. I thought it wasnt clean enough. So I cleaned and cleaned and CLEANED everything I tried the same thing cant get a bead to start! Tried different tungsten 2% thoirated, pure it doesnt matter. Changed every setting I can change Nothings changed. Maxed out the cleaning setting same thing. Doesnt matter what type of AL. The arc jumps all over the place. So I thought it was the flow so I changed it same thing. Is it because Im using pure argon or is it contaminated? Even have the same problem with wire but I can weld the AL but its black speckled so Im at a loss? Any Ideas?
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