Study on the Microstructure Characteristics and Mechanical Properties of Dissimilar Weld Joints of Coiled Tubing

This work aims to investigate the microstructure and mechanical behavior of dissimilar API X80-AISI 4130 steel welded joints coiled tubing. The at weld interface AISI side results in a relatively lower toughness. HAZ has an obvious coarsening phenomenon. tensile tests show that deformation process joint is mainly controlled by two base materials: beginning X80 its end. Charpy impact toughness conducted on specimens led us conclude higher Ni content accounts for more gradual decline tough-ness steel.