Anomaly analysis of tensile mechanical properties of welding test pieces

Aiming at the mechanical properties abnormality of one welding specimen for an aerospace cylinder, scanning electron microscope (SEM) and metallographic microscope were used to observe and analyze the fracture and weld structure of test pieces under tensile test, and the reason of property abnormality was obtained. On the fracture of welding test pieces under tensile test formed two evident characteristic zones, one of which was the initial zone looking like arc ribbons alternating with each other. More obvious texture structure formed in the welding heat affected zone, whose direction was consistent with that of the fracture in the up arc zonal fracture region. The reason of abnormality of tensile property of welding test pieces was that relatively significant texture structure formed in the welding heat affected zone, while the formation of texture structure was related to the temperature field and stress in the process of welding.