随焊激冷控制铝锂合金焊接接头残余应力规律研究  

Efficacyof intense coolingfor controlling residual stress in Al-Li alloys

作　　者：贺巍亮 霍曼 HE Weiliang;HUO Man(Department of Aeronautical Engineering,Shaanxi Polytechnic Institute,Xianyang 712000,Shaanxi,China)

机构地区：[1]陕西工业职业技术学院航空工程学院,陕西咸阳712000

出　　处：《金属功能材料》2023年第2期54-60,共7页Metallic Functional Materials

基　　金：陕西工业职业技术学院自然科学类重点项目(2022YKZD-011)。

摘　　要：采用ABAQUS软件对不同焊接工艺条件下2 mm铝/锂异种金属薄板搅拌摩擦焊过程进行数值模拟,通过建立搅拌摩擦焊热源与干冰冷源模型,将空冷和随焊干冰激冷条件下的温度场与应力场进行对比分析,研究发现:焊接温度场呈现前小后大的椭圆形分布,在垂直于焊缝方向的残余应力表现为“M”型趋势,并且残余应力的峰值位于搅拌头轴肩作用区的边缘位置。相较于空冷条件,随焊激冷工艺条件下AA2060焊件上表面的应力峰值降低约13%。在相同激冷距离下,随着激冷强度降低,热源与冷源间的温度梯度增大,焊件的残余应力降低,结果表明随焊激冷技术可以有效控制铝/锂薄板焊接残余应力。2mm thick Al/Li dissimilar alloys plate under different welding conditions were chosen for numerical simulation.The model of heat source and cold source are established by finite element analysis software ABAQUS.Temperature filed and stress field of friction stir welding was compared under conditions of air cooling and intense cooling.Results show that the temperature field during welding presents an elliptical distribution,and the residual stresses perpendicular to the weld exhibits an"M"tendency.Meanwhile,the peak residual stresses are located at the edge of the shoulder zone.Compared with the air cooling condition,the peak stress on the upper surface of the AA2060welded plate was reduced by 13%.At the same intense cooling distance,decreasing the intense cooling temperature increased the temperature gradient between the heat and cold sources,thereby leading to the decreased residual stresses.It has been shown that the residual stress in Al/Li alloys can be effectively controlled by intense cooling during welding.

关 键 词：铝锂合金 搅拌摩擦焊 温度场 残余应力 随焊激冷 

分 类 号：TG404[金属学及工艺—焊接] V261.34[航空宇航科学与技术—航空宇航制造工程]