随焊激冷影响铝锂合金FSW残余应力的规律  

Effects of Intense Cooling on Residual Stresses for FSWed A1-Ti Alloys

作　　者：贺巍亮 鲁欢 王彦诚 刘艳申[1] He Weiliang;Lu Huan;Wang Yancheng;Liu Yanshen(School of Aeronautical Engineering,Shaanxi Polytechnic Institute,Xian yang Shaanxi 712000,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：《陕西工业职业技术学院学报》2021年第1期10-16,23,共8页Journal of Shaanxi Polytechnic Institute

基　　金：陕西省教育厅2020年服务地方专项科学研究计划项目(项目编号:20JC002);陕西工业职业技术学院2020年自然科学类项目(项目编号:2020YKYB-045)。

摘　　要：以2 mm厚2060铝锂合金板材作为研究对象,基于ABAQUS有限元软件对空冷和激冷条件下铝锂合金搅拌摩擦焊的温度场和应力场进行研究,并对模拟结果进行试验验证。结果表明,焊接过程中的温度场均呈现椭圆形分布,垂直于焊缝方向残余应力呈现双峰分布,并且残余应力的峰值位于搅拌头轴肩作用区的边缘位置。相比较于空冷条件,随焊激冷下焊件上表面的应力峰值降低了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。Choosing 2 mm thick A1—Ti alloy plate as the research object,temperature filed and residual stress of FSW were simulated by ABAQUS software under conditions of air cooling and intense cooling.The results of simulation were verified by experiments.Results show that the temperature field during welding presents an elliptical distribution,and the residual stresses are of bimodal type perpendicular to the weld.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 welded 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.

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：TG439.8[金属学及工艺—焊接]