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Getting full and uniform penetration on 11 ga carbon can be a challenge.
Sometimes requires a bevel and 2 passes
In this video...Tips for Walking the Cup welding a Stainless Steel flange to Carbon Pipe
this video shows hot pass, fill, and cap on carbon pipe welded to a stainless flange...not walking the cup
This video shows tig welding carbon steel coped tubing with settings, gas flow with a 10 cup, and common mistakes