Parameter optimization of dissimilar resistance spot welding on ultra-high strength hot-stamped steel and mild steel by numerical simulation

Wen ZHENG 1),Min WANG 1),Liang KONG 1),Xuanting CHENG 2) and Ming LEI 3) 1) Shanghai Key Laboratory of Materials Laser Processing and Manufacture,Shanghai Jiao Tong University,Shanghai 200240,China 2) Shanghai Yirui Car Technology Co.,LTD,Shanghai 201814,China 3) Bao Steel Technology Center,Shanghai 201900,China

摘 要：In this study,a coupled axisymmetric finite element model （FEM） was built to simulate the resistance spot welding （RSW） process between ultra-high strength hotstamped （UHSS） and mild steel by SORPAS software.Via simulating this process,the temperature distribution and dynamic temperature curves of the welding area were studied,and welding spatter phenomena were predicted and validated by comparing them with experimental results.By adjusting the welding parameters in numerical simulation,appropriate welding parameters were achieved.Moreover,the mechanical properties of the welding joints under the optimized conditions were also compared with those of not optimized.The study results have already been applied in a manufacturing production.It can also provide guidance for the RSW on UHSS and mild steel.

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