多层多道焊接转子工艺模拟及参数优化  

PROCESS SIMULATION AND PARAMETER OPTIMIZATION OF MULTI-LAYER MULTI-PASS WELDED ROTOR

作　　者：王宇超 朱明亮[1] 范曼杰 霍鑫 轩福贞[1] WANG YuChao;ZHU MingLiang;FAN ManJie;HUO Xin;XUAN FuZhen(School of Mechanical and Power Engineering,East China University of Science and Technology,Shanghai 200237,China;Shanghai Electric Power Generation Equipment Co.,Ltd.,Shanghai 200240,China)

机构地区：[1]华东理工大学机械与动力工程学院,上海200237 [2]上海电气电站设备有限公司,上海200240

出　　处：《机械强度》2023年第6期1380-1386,共7页Journal of Mechanical Strength

基　　金：国家自然科学基金项目(51922041)资助。

摘　　要：以汽轮机焊接转子为研究对象,建立多层多道氩弧焊工艺的二维轴对称有限元模型,采用双椭球体热源模型,利用生死单元技术及Dflux热源移动子程序对焊接工艺过程进行数值模拟,分析温度场与应力场的分布及焊接工艺优化方法。结果表明,多层多道焊接过程中,温度经历多次升温与冷却,形成复杂的热载曲线,后层焊接对前层具有显著的应力释放作用,焊缝区平均应力水平降幅可达20%,两侧基体平均应力水平升高,改善了接头应力分布的不均匀性;同层3条焊道相对2条焊道的焊缝区域应力水平略有下降,但高应力水平区宽度增加,焊接变形增大,坡口顶部及底部的变形量增大约7.9%。研究认为,同层焊道数量对接头应力及变形具有重要影响,应合理选择。Taking the welded rotor of steam turbine as the research object,a two-dimensional axisymmetric finite element model of multi-layer and multi-pass TIG arc welding process was established.By using the double ellipsoidal heat source model,the element birth and death method and the Dflux heat source movement subroutine,the welding process was numerically simulated,and the distribution of temperature field and stress field and the optimization method of welding process were analyzed.The results show that a complex heat load curve was formed after repeated heating and cooling during the multi-layer and multipass welding process,and the average stress level of the matrix on both sides increases,which improves the uneven stress distribution of the welds.The stress level of the weld zone of the three passes in the same layer decreased slightly compared with the two passes,but the width of the high stress level zone increased,and the welding deformation increased by about 7.9%at the top and bottom of the groove.The research suggests that the number of welding passes in the same layer has an important influence on the stress and deformation of the welds,which should be selected reasonably.

关 键 词：多层多道氩弧焊 数值模拟 应力场 温度场 工艺优化 

分 类 号：TG444[金属学及工艺—焊接]