Temperature Fields and Residual Stress of Laser Welded AISI 304 Steel-Niobium Dissimilar Joint
SHI Chao1, SHI Mingxiao1, ZHAO Jian2, CHEN Shujin1, YANG Zhidong1
1. School of Materials Science and Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, China;
2. School of Materials Engineering, Shanghai University of Engineering Science, Shanghai 201620, China
Abstract：The dynamic simulation of AISI 304 steel–Nb dissimilar metal laser welding process is carried out by using SYSWELD software. On the basis of studying the temperature field of laser welded AISI 304 steel–Nb dissimilar joint, the residual stress distribution of welded sheet is analyzed. The results show that the temperature field of dissimilar metal welding is asymmetrical, and the high temperature region of Nb side is wider than that of stainless steel side. And there is the maximum residual tensile stress in the middle of weld along the welding direction, whether transverse residual stress or longitudinal residual stress. Perpendicular to the weld direction, the transverse residual stress and longitudinal residual stress are larger in the welding line near line section, and the distribution pattern is “M”. The longitudinal residual stress is residual tensile stress in the weld zone, and the transverse residual stress appears compressive stress in the center of the weld.
2019, 
