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I have a question with My Lincoln tig 335 welder, when I step up to using a 5/32 tungstein pure or thoriated rod,and start welding 3/8 aluminum, the weld becomes real contaminated looking and will not even take the filler rod, and now if I down size to a 1/8 tungstein rod pure or even red with same settings I have know problem welding, except the tungstein starts to go away for the heat, I am using 280 amps and that is max for that tungstein, I have changed cups to bigger to get more cleaning action, I run the argon at 12 to 20 on the flow meter, trying different combinations, but it almost seems that I am pushing the weld, when I start to use the 5/32 tungstein, I know I have still not given enough information, but if you can get me started down the right path, I will feed you more. thanks for anything....Jim.........

Lincoln 335 Tig Welder
Parts and Repair
Replies 3 Post by southpaw