Investigation into the local continuous heating calibration process of a 304 stainless steel pipe by electrically assisted roll bending

Abstract

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