Been working on T joints with aluminum. Using 1" x 1/8" strips of 6061, 3/32" 4043 filler, 3/32" 1.5% Lanth Tungsten (sharpened, point rounded to a small ball), 100hz, 75 balance. Running the torch as close as I dare to the puddle, and contaminating a tungsten once in a while, so thinking that I must be keeping a tight arc
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When I lay down just a bead, it looks nice, shiny, good cleaning action and gas coverage. It's when I do the T welds that the problems happen, having a hard time penetrating into the corner, if I give it enough amps to wash into the corner, it overheats the material on the legs (filler like water, grainy weld, ripples washed out - not distinct, pretty much all the "you are welding too hot" clues. If I lower the amperage, I can get a decent weld on the legs, but it doesn't drop down into the root. Also when I lower the amperage the arc wants to favor one leg or the other, hard to keep equal heat on both of the legs. Running a straight forward and backward motion, keeping the point aimed right at the root.
Thank you in advance for your thoughts, this site is such a wonderful resource!
-- Pete