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These guys like a process that delivers the best quality without spatter and fumes. They also like that they dont have to change weld processes from the root to the fill. The UA union has some of the best pipe welders in North America and when you put TIP TIG in the hands of there pipe welders a little weld magic occurs. Remember for the fill pass there is 200-300 more TIG weld. No starts - stops, no worry about root gap changes, no spatter, no smoke issues and welders are more comfortable.