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i have a durma 80 profile roller with 2" pipe dies ( 2 .375 od ) trying to coil 2" pipe to 30" od 20 ft joints , it roll the pipe but brakes before or after the weld , some work . 3 joints / 2 joints /5 joints pipe is astm a53 gr b sch40 pipe try mig welding pre heat/ pro heat / stick...