fwiw: the longest part of the miter where there's not much "crotch" is the hardest part to TIG weld. In your pics I see a bit of cold lap in that area. maybe try slowing down a bit there and sinking in a little more heat. the best advice I ever got when I was learning how to weld was "wait until she's begging for it, then add the filler rod" not sure if that's the most PC statement but it made be a better welder...
thanks for the advice. so the cold lap are the parts where the weld bead does not fully 'wet out' (using a brazing term) on the adjoining parent metal?im still working on getting the penetration i want, so i think your advice helps, wait till she really wants it! its such a fine line between getting full penetration and blowing a hole in the mitered tube. when i cut it apart i can clearly see how far through the filler is.ill do another run of practice chunks tonight and see how goes it!
Yes, “slowing down and putting a little hit” is the trick. Just wait until the bubbly thing is gone. I learned that from a steel strapping suppliers’ delivery driver who happens to be a professional welder back then. He taught me simple and basic tricks of welding after delivering steel strapping supplies. So everytime delivery week comes, I am able to learn one new trick about steel and welding. One trick a week isn’t so bad!
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