铝合金电阻凸焊过程直接模拟  

A direct modeling of aluminum projection welding process

作　　者：王仕仙[1] 卢霞[1,2] 丁一刚[2] 喻九阳[3] 王成刚[3] 

机构地区：[1]武汉工程大学邮电与信息工程学院,武汉430073 [2]武汉工程大学化工与制药学院,武汉430073 [3]武汉工程大学机电工程学院,武汉430073

出　　处：《焊接学报》2017年第3期99-102,共4页Transactions of The China Welding Institution

基　　金：湖北省教育厅科学研究指导性资助项目(B2016485)

摘　　要：文中采用ANSYS对电阻凸焊过程进行直接模拟,选用plane223单元同时模拟热、电、结构耦合过程,模拟焊核尺寸与试验结果基本吻合,验证了模拟算法的正确性.结果表明,预压阶段的最大应力、应变位于凸焊筋周围,最大应力超过材料屈服极限,凸焊筋周围形成塑性变形区;通电焊接过程,最高温度位于凸焊筋与封装盖板的贴合面上,随着温度升高凸焊筋迅速压溃,通电后半阶段为焊核形成阶段,最终得到的熔深为1.42 mm;直接模拟电阻凸焊过程可以为选择合理的凸焊工艺参数提供良好的理论依据.The resistance projection welding process was modeled in this work.The element of plane 223 was adopted to simulate thermal-electric-mechanical coupled projection welding simultaneously.The simulation result was compared with that of the experiment.The nugget size showed good agreement between simulation and experiment which vertified the model.The simulation result showed that the maximum von-mises stress and strain located around the projection and exceeds the yield stress of aluminum,forming a plastic strain zone.At welding period,the maximum temperature located in the faying interface between projection and seal cover.Along with the temperature rising,the projection collapsed rapidly and the nugget was formed in the later stage of welding period.The final depth of fusion was 1.42 mm.The direct molding of resistance projection welding provide a good reference for optimize the technology parameters.

关 键 词：电阻凸焊 直接模拟 多场耦合 凸焊筋压溃 焊核形成 

分 类 号：TG453.9[金属学及工艺—焊接]