Investigation into the Local Continuous Heating Calibration Process of a 304 Stainless Steel Pipe by Electrically-assisted roll bending

A promising technology of local continuous heating calibration process (LCHCP) was investigated by applying different parameters of electropulsing on the circumferential arc shell of a 304 stainless steel pipe during roll bending process. In comparison to the cold calibration process, the roundness of the pre-deformed 304 stainless steel pipe was significantly improved as increasing the current density and the electropulsing width. The ring gaps in characterization of the springback possessed the similar response to both the current density and the electropulsing width. Meanwhile, a stress relaxation constitutive model considering the electropulsing was employed to fit the ring gaps greatly.