Bulging Distortion of Austenitic Stainless Steel Sheet on the Partially Penetrated Side of Non-Penetration Lap Laser Welding Joint  

作　　者：Chengwu Yao Enze Liu Jiaming Ni Binying Nie 

机构地区：[1]Shanghai Key Laboratory of Materials Laser Processing and Modification,School of Material Science and Engineering,Shanghai Jiao Tong University,Shanghai 200240,China [2]Shanghai Aerospace Precision Machinery Institute,Shanghai 201600,China [3]Chemical and Biological Engineering College,Yichun University,Yichun 336000,China

出　　处：《Chinese Journal of Mechanical Engineering》2024年第1期286-295,共10页中国机械工程学报（英文版）

摘　　要：Non-penetration laser welding of lap joints in austenitic stainless steel sheets is commonly preferred in fields where the surface quality is of utmost importance.However,the application of non-penetration welded austenitic stainless steel parts is limited owing to the micro bulging distortion that occurs on the back surface of the partial penetration side.In this paper,non-penetration lap laser welding experiments,were conducted on galvanized and SUS304 austenitic stainless steel plates using a fiber laser,to investigate the mechanism of bulging distortion.A comparative experiment of DC01 galvanized steel-Q235 carbon steel lap laser welding was carried out,and the deflection and distortion profile of partially penetrated side of the sheets were measured using a noncontact laser interferometer.In addition,the cold-rolled SUS304 was subjected to heat holding at different temperatures and water quenching after bending to characterize its microstructure under tensile and compressive stress.The results show that,during the heating stage of the thermal cycle of laser lap welding,the partial penetration side of the SUS304 steel sheet generates compressive stress,which extrudes the material in the heat-affected zone to the outside of the back of the SUS304 steel sheet,thereby forming a bulge.The findings of these experiments can be of great value for controlling the distortion of the partial penetrated side of austenitic stainless steel sheet during laser non-penetration lap welding.

关 键 词：Non-penetration lap laser welding Bulging distortion Austenitic stainless steel Compressive stress Tension stress 

分 类 号：TG1[金属学及工艺—金属学]