Saw this one recently in a metal shaping book...
As a cheat to gas back your TIG welds lay some fiberglass tape on the back side of the weld and then cover it with metal AC ducting tape. The fiberglass allows the shielding gas to pocket on the back side of the weld and the metal tape holds the gas in the fiberglass.
I'm going to try it on my next TIG project just to see how it works!
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