焊后热处理改善管道直焊缝残余应力的数值模拟研究  

Numerical Simulation of Post⁃welding Heat Treatment to Improve Residual Stress in Straight Weld of Pipeline

作　　者：张皓 李新战 韦正鑫 徐琳 ZHANG Hao;LI Xinzhan;WEI Zhengxin;XU Lin(CNPC Tubular Goods Research Institute Co.,Ltd.,Xi′an 710077,China;State Key Laboratory for Performance and Structure Safety of Petroleum Tubular Goods and Equipment Materials,Xi′an 710077,China;Gansu Shaanxi Gas Pipeline Branch of West East Gas Pipeline Company of PipeChina,Xi′an 710018,China;PipeChina West Pipeline Company,Urumqi 830011,China;Oil Production Technology Research Institute of the Fifth Oil Production Plant of Changqing Oilfield Branch,Qingyang 745699,Gansu,China)

机构地区：[1]中国石油集团工程材料研究院有限公司,西安710077 [2]石油管材及装备材料服役行为与结构安全国家重点实验室,西安710077 [3]国家管网集团西气东输公司甘陕输气分公司,西安710018 [4]国家管网西部管道公司,乌鲁木齐830011 [5]长庆油田分公司第五采油厂采油工艺研究所,甘肃庆阳745699

出　　处：《焊管》2023年第9期14-20,共7页Welded Pipe and Tube

基　　金：国家重点研发计划“高压力高钢级管道失效机理及全生命周期可靠性评价技术研究”(项目编号2022YFC3070101);中国石油天然气集团公司科学研究与技术开发项目“X80管道环焊缝断裂评估研究”(项目编号2018D-5009-07)。

摘　　要：以X80钢级Φ1219 mm直缝埋弧焊管为研究对象,采用有限元软件ABAQUS,通过顺序耦合算法和移动热源子程序及生死单元形式,对钢管直缝焊和经热处理后焊缝的残余应力进行了数值模拟,分析焊后热处理对焊缝残余应力的改善作用。结果表明,焊缝等效最大残余应力和轴向拉应力均出现在外层焊缝的中心处,局部焊后热处理能降低焊缝的残余应力,等效峰值应力由560MPa左右降低到约430MPa,降低了23.2%;焊缝轴向拉应力也由450MPa降低到370MPa。焊后热处理对残余应力分布影响不大,但能使焊接接头的应力变得更为均匀。Taking X80 steelΦ1219mm SAWL pipe weld the research object,the residual stress of straight weld and weld after heat treatment was simulated by finite element software ABAQUS through sequential coupling algorithm,moving heat source subroutine and birth-death element form,and the improvement effect of post-weld heat treatment on weld residual stress was analyzed.The results show that the equivalent maximum residual stress and axial tensile stress of the weld of SAWL pipe both appear in the center of the outer weld,and the local post-welding heat treatment can reduce the residual stress of the weld,and the equivalent peak stress decreases from 560 MPa to 430 MPa,which reduces by 23.2%.The axial tensile stress of the weld is also reduced from 450 MPa to 370 MPa.Post-welding heat treatment has little effect on residual stress distribution,but can make the stress of weld more uniform.

关 键 词：X80直缝埋弧焊管 焊接残余应力 焊后热处理 盲孔法 生死单元 

分 类 号：TG441.8[金属学及工艺—焊接]