几种焊接缺陷对X70管道环缝接头应力集中的影响

利用大型有限元软件ANSYS对在工作压力下带有咬边、凹坑、焊缝余高、错边等焊接缺陷的X70环缝管道进行了应力分析。分析结果显示,在咬边、凹坑、焊缝余高、错边焊接缺陷中,焊缝余高对受内压管道环焊缝的应力集中的影响最低,错边其次,咬边较为严重,凹坑最为严重;焊缝余高不影响X70管道接头静载强度,超过2 mm的错边量对环缝接头应力集中影响明显,咬边缺陷对X70管道环缝接头应力集中的影响大于错边,缺陷凹坑缺陷对环缝接头应力集中的影响随其三维尺寸增大而增大。

Influences on Stress Concentration of X70 Pipeline Circumferential Weld Joints of Several Welding Defects

In this paper, the finite element analysis software ANSYS was used to can.y out stress analysis on X70 pipeline under working pressure with welding defects, such as undercut, pit, weld reinforcement and misaligmnent. The results indicated that in the above defects, the influence on the weld reinforcement of stress concentration is the lowest, misalignment is the second, undercut is a bit severe, and the influence on pit is the most severe. The weld reinforcement does not affect the static load strength of X70 pipeline circumferential weld joints, and the influence of misalignment more than 2 mm on stress concentration is obvious. The influence of undercut on stress concentration is more than that of misalignment, and the influence of pit increases with three-dimensional size increasing.