动力电池箱MIG焊的数值模拟及变形控制研究  

Research on numerical simulation and deformation control of melt inert-gas welding in power battery enclosure

作　　者：胥军[1] 邓峰 苏田 李刚炎[1] XU Jun;DENG Feng;SU Tian;LI Gangyan(School of Mechanical&Electric Engineering,Wuhan University of Technology,Wuhan 430070,China)

机构地区：[1]武汉理工大学机电工程学院,湖北武汉430070

出　　处：《中山大学学报（自然科学版）（中英文）》2021年第5期50-58,共9页Acta Scientiarum Naturalium Universitatis Sunyatseni

基　　金：中国博士后科学基金(2018M642937);湖北省科技厅条件平台建设项目(2015BCE08)。

摘　　要：以某型动力电池箱为例,首先提取具有独特特征的典型焊缝,采用SYSWELD软件进行焊接应力变形数值模拟,获取各焊缝焊接顺序方向的优选方案。然后,基于典型焊缝分布特点和焊接工艺原则,提出箱体整体焊接顺序方向的候选方案,并以等效变形量均值最小为原则确定优选方案;最后,采用刚性固定法依次确定x、y、z方向的焊接加工约束条件。现场实验结果表明,采用优选的整体焊接顺序方向与约束条件后,动力电池箱长、短边箱壁内缩变形量较优化前分别降低了52%和25%,分别减小至1.2 mm和0.9 mm。In pure electric vehicle,power battery enclosure generally made of aluminum alloy profile and is a key component of packaging and load bearing of the power battery system.Due to the large structure size and the high thermal expansion coefficient of materials,welding residual stress is easily generated after the inert-gas welding process,which leads to serious shrinkage and deformation of the inner wall.A certain type of power battery enclosure was taken as the research object.Firstly,the typical weld with unique characteristics was extracted,and the optimal solution for welding sequence direction of each typical weld was obtained through numerical simulation of stress deformation by using SYSWELD.Then,the candidate schemes of overall welding sequence direction were proposed based on the distribution characteristics of typical weld and welding process principles,and the optimal scheme was selected based on the principle of minimum mean value of equivalent deformation.Finally,the constraint conditions for welding process in x,y and z directions were determined by adopting the method of rigidity immobility.Field test results have shown that internal shrinkage deformation value of the power battery enclosure’s long and short sides is reduced by 52%and 25%than before,which are decreased to 1.2 mm and 0.9 mm respectively.

关 键 词：动力电池箱 熔化极惰性气体保护焊 焊接顺序方向 刚性固定法 

分 类 号：TG444.74[金属学及工艺—焊接]