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What grade of stainless are you attempting to weld?
If you dont purge stainless tubing/pipe when welding, you are going to introduce sugaring in the weld and the quality of weld suffers. I would never weld stainless tubing/pipe without back shielding. Bad idea.
Lincoln Idealarc 250 stick/tig Miller Bluestar 2E Thermal Arc Hefty 2 feeder Thermal Dynamics Cutmaster 52 Torchmate CNC table Ironworker Welder Operating engineer Owner/Operator Devlin Metal Works Custom CNC Plasma Cutting and Welding