电焊机2018，Vol.48Issue(5)：47-53,7.DOI:10.7512/j.issn.1001-2303.2018.05.10
轨道车辆铝合金MIG焊搭接接头应力及变形研究
Research on stress and deformation of aluminum alloy lap joint by MIG of railway vehicles
摘要
Abstract
In order to meet the requirement of weight reduction,rail vehicles are increasingly using aluminum alloys.The lap joint is one of the common forms of rail vehicles and it is of great significance to optimize the welding process,reduce the welding deformation and improve the service life of rail vehicles by exploring the welding residual stress distribution and deformation regularities.The MIG welding temperature fields,stress fields and deformation of 2.2 mm and 3 mm lap joints of 6005A-T6 aluminum alloy are simulated by using thermo-elastic-plastic finite element method.The simulation results are compared with the experimental ones.It is shown that they are in good agreement,which verifies the accuracy of the established finite element model.The welding residual stress of aluminum alloy lap joint is mainly distributed in the weld and heat affected zone,the change in the thickness direction is not obvious,on the whole,the distribution of residual stresses is asymmetric.Welding deformation mainly appears at the edge of the lower plate parallel,the maximum deformation reaches 2.6 mm,and in the longitudinal direction of the plate also produces concave downward deformation.关键词
铝合金/搭接接头/数值模拟/温度场/应力变形Key words
aluminum alloy/lap joint/numerical simulation/welding temperature field/stress and deformation分类
矿业与冶金引用本文复制引用
丁洁琼,火巧英,金文涛,宋树崎,赵文勇,刘湘波,魏艳红..轨道车辆铝合金MIG焊搭接接头应力及变形研究[J].电焊机,2018,48(5):47-53,7.基金项目
江苏高校优势学科建设工程资助项目(PAPD) （PAPD）
中央高校基金重大项目培育基金(NP2016204) （NP2016204）
