I do back feeding every day, it just takes practice. Looking through the gap is harder than being down there and look from the side. I weld hot on the overhead.

I performed an experiment with stainless pipe (sch 80): Problem: Stainless pipe can get too hot which leads too poor weld quality I attempted to provide a heat sink by wrapping braided copper wire around the pipe , on each side of weld. I wrapped the copper wire around the pipe twice, with the coppe...