2219铝合金搅拌摩擦焊温度与残余应力热力耦合模拟  

Thermal Mechanical Coupling Simulation of Temperature and Residual Stress in Friction Stir Welding of 2219 Aluminum Alloy

作　　者：万胜强 吴运新 龚海[1,2,3,4] 聂林 WAN Shengqiang;WU Yunxin;GONG Hai;NIE Lin(Research Institute of Light Alloys,Central South University,Changsha 410083,China;School of Mechanical andElectrical Engineering,Central South University,Changsha 410083,China;State Key Laboratory of High-PerformanceComplex Manufacturing,Central South University,Changsha 410083,China;Nonferrous Metal Oriented AdvancedStructural Material and Manufacturing Cooperative Innovation Center,Central South University,Changsha 410083,China)

机构地区：[1]中南大学轻合金研究院,湖南长沙410083 [2]中南大学机电工程学院,湖南长沙410083 [3]中南大学高性能复杂制造国家重点实验室,湖南长沙410083 [4]中南大学有色金属面向先进结构材料和制造合作创新中心,湖南长沙410083

出　　处：《热加工工艺》2019年第13期159-163,共5页Hot Working Technology

基　　金：国家自然科学基金项目(51405520);联合基金项目(U1637601)

摘　　要：针对航空用2219铝合金,基于搅拌摩擦焊产热理论开发了自适应移动热源,结合商用有限元分析软件MSC.marc,建立了搅拌摩擦焊过程的有限元模型。同时,对焊接过程中的动态温度场及焊后残余应力场的分布进行了详细研究。结果表明,焊接过程中稳定焊接温度达532.4℃,峰值温度达到570℃,焊后焊缝区域应力以纵向应力为主,垂直于焊缝的截面的应力呈M型分布,最大值约为146MPa。此外,针对10mm厚的2219铝合金板材开展了搅拌摩擦焊实验,利用ProtoX射线仪对焊后残余应力进行测试,验证模型准确性。In view of 2219 aluminum alloy for aviation, an adaptive moving heat source was developed based on the heat generation theory of friction stir welding(FSW), and a finite element model of friction stir welding was established combined with the commercial finite element analysis software MSC.marc. At the same time, the dynamic temperature field in welding process and the distribution of residual stress field after welding were studied in detail. The results show that the stable welding temperature reaches 532.4 ℃, the peak temperature reaches 570 ℃, longitudinal stress is the main stress in weld zone after welding, and the shape of the stress in section perpendicular to the weld seam is M, and the maximum value is about 146 MPa. In addition, the experiment of friction stir welding(FSW) of the 2219 aluminum alloy plate with the thickness of 10 mm was carried out and the residual stress after welding was tested by Proto X ray instrument to verify the accuracy of the model.

关 键 词：搅拌摩擦焊 温度场 残余应力场 2219铝合金 

分 类 号：TG404[金属学及工艺—焊接]