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Hehehe,I'll have to try and find that cut!LOL!!!
What waht?Basically it involves getting somewhat thin metal so hot it can pick up contaminates from the other side of the weld. Even worse in pipes and tubes where it can hold the bad stuff near the weld if you do not purge the "normal" air out and fill with the proper gas. Not saying thats whats happening with the starting post of this thread but it should be considered.
I would do it if I were tigging. The solar flux stuff looks like a good alternative, but what happens to it after you weld it shut inside the header?
One thing they finnally caught on was the guys who came in had gas on the outside BUT ALSO flowed gas INSIDE the tubes to prevent contamination from the other side. They would have devices that nearly plugged the tube ends then flow enough gas to keep the insides full of the gas they wished