Monday I will be starting a project which involves tigging very long outside corner seams in 1/16th aluminum sheet. The seam is set up with just the inner edges touching. Using 1/16" lanth. tungsten with 1/16"4043 wire filler. I have a gas lens. I plan to tack every 4-6 inches, then I will stitch every 3rd or fourth segment to try to keep the piece from getting too hot. I need to keep warpage to a minimum. My 2' test sample got rather warm, but I was using too big a tungsten, (1/16" will be delivered Monday) and the amount of metal (width of sheets) was less than the actual plates, but some of these seams may be 8-10 feet in total length.
If anybody has words of wisdom, I'm eager to learn from your mistakes so I don't need to learn from mine! I think my employer prefers that way too!
I have seen mentions of using a copper chill block to help avoid blow through, how big a block of copper is needed to work effectively?