边界约束对挖斗支耳焊接残余应力及变形的影响研究  

Research on Boundary Constraints Effect on Welding Residual Stress and Deformation of Bucket Lug

作　　者：高翰林 刘国兴 鲍庆河 李鑫 王倩 崔方玲 支虔坤 周鹏 柳学强 徐杰[1] Gao Hanlin;Liu Guoxing;Bao Qinghe;Li Xin;Wang Qian;Cui Fangling;Zhi Qiankun;Zhou Peng;Liu Xueqiang;Xu Jie(School of Materials Science and Physics,China University of Mining and Technology,Xuzhou 221116,China;Xuzhou BUT Construction Machinery Joint-stock Co.,Ltd.,Xuzhou 221004,China)

机构地区：[1]中国矿业大学材料与物理学院,江苏徐州221116 [2]徐州巴特工程机械股份有限公司,江苏徐州221004

出　　处：《煤矿机械》2022年第2期29-33,共5页Coal Mine Machinery

基　　金：江苏省双创博士项目(2019年度);国家自然科学基金资助项目(51301197);江苏省自然科学基金资助项目(BK20130182);国家重点研发项目(2018YFB2001204)。

摘　　要：基于热弹塑性有限元方法,应用MSC.Marc仿真软件对某型号挖掘机挖斗支耳关键焊缝的焊接过程进行了模拟计算,分析了不同约束方式及底板约束面积对焊接残余应力及变形的影响。结果表明:支耳中间弓形板及焊缝区域残余应力较大,改变约束对应力大小有明显影响;侧边约束有助于减小支耳变形,但会增大焊接残余应力;底板约束面积对焊接残余应力和变形均有显著影响。通过比较分析,为实际约束方案的制定和优化提供了理论依据。Based on the thermal elastoplastic finite element method, the welding process of the key welds of the bucket lug of an excavator was numerically calculated by MSC.Marc software. The effects of different constraint methods and floor constraint area on the residual stress and welding deformation were analyzed. The results show that the residual stress in the middle arch plate and weld area of the lug is large, and the change of constraint exhibits obvious influence on the stress values. The lateral restraint is helpful to control the deformation of the lug, but it will increase the overall residual stress. Base plate constraint area has significant effect on welding residual stress and deformation. Through comparative analysis, theoretical basis was provided for the formulation and optimization of actual constraint scheme.

关 键 词：边界约束 挖斗支耳 焊接残余应力 焊接变形 数值模拟 

分 类 号：TG404[金属学及工艺—焊接]