CP980钢电阻点焊数值模拟及接头力学性能分析  

Numerical Simulation on Resistance Spot Welding of CP980 Steel and Analysis of Mechanical Properties of Welded Joint

作　　者：田帅 冯巧波 王春亮 张瑞 TIAN Shuai;FENG Qiaobo;WANG Chunliang;ZHANG Rui(School of Energy and Mechanical Engineering,Shanghai University of Electric Power,Shanghai 201306,China;Shanghai Key Laboratory of Power Materials Protection and New Materials,Shanghai University of Electric Power,Shanghai 200090,China)

机构地区：[1]上海电力大学能源与机械工程学院,上海201306 [2]上海电力大学上海市电力材料防护与新材料重点实验室,上海200090

出　　处：《上海金属》2024年第6期58-64,共7页Shanghai Metals

基　　金：国家自然科学基金(52175343)。

摘　　要：运用ABAQUS软件建立热-电-力场耦合的有限元模型,模拟了CP980复相钢电阻点焊接头熔核的形成过程,并采用智能伺服点焊系统对CP980钢进行电阻点焊试验,研究了焊接电流对接头力学性能的影响。结果表明:CP980钢点焊接头熔核尺寸的模拟结果与试验值的偏差在5%之内,吻合度较高;接头拉剪力随焊接电流的增加先增大后减小,当电流增大到9.5 kA时,拉剪力达到峰值23.2 kN;接头熔核区显微组织以马氏体为主,硬度最高约为430 HV0.3,较母材提高了约25%;接头热影响区出现回火软化现象,硬度最低约320 HV0.3,较母材下降了7.8%。Finite element model of thermal-electrical-force field coupling was established by ABAQUS software to simulate the nugget formation process in resistance spot welding of CP980 complex phase steel,and the resistance spot welding test was carried out on CP980 steel with an intelligent servo welding torch spot welding system to study the influence of welding current on the mechanical properties of the joint.The results indicated that(a)the deviation between the simulated and experimental values of the nugget size of the spot welded joints of CP980 steel was within 5%,indicating a high degree of agreement;(b)the tensile shear force of the joints first increased and then decreased with the increase in welding current,and when the current increased to 9.5 kA,the peak tensile shear force reached 23.2 kN;(c)the microstructure in nugget zone of the joints was mainly martensite with a maximum hardness of about 430 HV0.3 which was about 25%higher than that of the base metal;and(d)there was temper softening phenomenon in the heat-affected zone of the joint,its minimum hardness was about 320 HV0.3 which was 7.8%lower than that of base metal.

关 键 词：复相钢 电阻点焊 力学性能 有限元模拟 

分 类 号：TG453.9[金属学及工艺—焊接]