X65管线焊接残余应力数值模拟  

Numerical Simulation on Welding Stress for X65 Pipe Line

作　　者：卢顺[1] 周杰[1] 李梦瑶[1] 余盈燕[1] 丁永峰[1] 

机构地区：[1]重庆大学材料科学与工程学院,重庆400044

出　　处：《热加工工艺》2013年第19期156-157,161,共3页Hot Working Technology

基　　金：中国科技部重大专项项目(G09003.8-1);中国国家自然科学基金面上项目(51275543)

摘　　要：采用焊接有限元数值分析软件,建立了基于X65管线的焊接有限元简化模型,采用双椭球热源模型,模拟管线环缝焊接修复过程,并分析焊接温度场和应力场。结果表明,焊接残余应力随与焊缝中心距离的增加不断减小,在冷却到200 s后,由于熔融金属的凝固收缩,焊缝附近的Von Mises应力有上升趋势,最大值出现在焊趾位置,管内壁为523 MPa,管外壁为489 MPa。焊后需采取必要措施消除焊接残余应力,以避免因应力过大而产生的裂纹等缺陷。The pipe welding repair process was simulated based on simplified finite element model by finite element analysis software. With double ellipsoid heat source model, the welding temperature and stress field was analyzed. The results show that the welding residual stress decreases gradually with the increase of the distance to the welding center. Due to the solidification of the molten metal, the Von Mises stress increases near the welding seam when the welding zone is cooled to 200 s. The maximum welding residual stress appears at the weld toe, which are 523 MPa and 489 MPa, respectively at the inner and outer wall of the pipe. In order to avoid the excessive stress crack, the necessary treatments are need for relieving the welding residual stress.

关 键 词：X65 管线 残余应力 数值模拟 

分 类 号：TG404[金属学及工艺—焊接] TG457.6