I use a gas lense with a big cup which can allow you a lot of tungsten stick out which makes life easier. I built in in two halves basically then welded it all together but it is still tight getting down in between the tubes.
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And I'm the loser that can only MIG lol. I can get stainless wire, but with me not caring about looks and mild steel expanding less with heat, I'll probably stick with mild.
Ghost, mind PMing or texting me how much your local place charges for 1.5" and 3" mild steel sch 40 90 elbows?
How thick can a machine like that weld? I have dabbled with tig here and there but know little about it
When you overheat the welds they turn grey, that's the chromium burning. It takes away the corrosion resistance and strength away from the weld. So the lower you can keep the amperage, and still make full pen etc. the stronger and more corrosion resistance it will have. The gold/purple/blue is what your looking for.