基于磁控技术GTAW焊接残余应力的有限元模拟  

FEM Simulation Analysis for Residual Stress to GTAW Welded Joints Based on Magnetic Technology

作　　者：钟其林[1] 江淑园[1] 陈焕明[1] 刘频[1] 

机构地区：[1]南昌航空大学航空制造工程学院,江西南昌330063

出　　处：《热加工工艺》2012年第7期112-114,共3页Hot Working Technology

基　　金：江西省自然科学基金资助项目(CA201003023)

摘　　要：通过建立磁控GTAW电弧热源模型,同时考虑材料物理性能随温度的变化和相变的影响,以及运用生死单元技术处理熔池的熔化与凝固,对有无外加磁场作用GTAW焊接接头温度场及残余应力的大小分布进行了有限元模拟。结果表明,相较于无外加磁场作用,磁控GTAW焊件最大纵向残余应力下降12.3%,最大横向残余应力下降了13.6%。采用小孔法对焊件残余应力进行测量,模拟结果与试验结果基本吻合。In this paper, through importing the magnetic technology effect on GTAW arc, decreasing the maximum welding residual stress, avoiding the temperature excessive focus on welding pool and reducing temperature gradient, Arc heat source model of GTAW under the magnetic field was established, considering physical properties of materials varying with the temperature and the influence transformation. Through the method of killing or activating elements treawaent such as melting or solidification by welding pool, FEM simulation analysis for the temperature gradient and residual stress size distribution to GTAW welded joints was compared with on magnetic field or not. The results show that maximum weld longitudinal residual stress and transverse residual stress respectively reduce by 12.3% and 13.6% when compared with no magnetic field, when using blind hole measuring method, me welding residual stress is measured, Test measurement and simulation values are basically consistent.

关 键 词：磁控技术 GTAW 焊接残余应力 有限元模拟 

分 类 号：TG442[金属学及工艺—焊接]