摘要
为了解决传统管道环焊修复过程中热输入大及残余应力集中的问题,采用ANSYS建立三维热-结构耦合模型,模拟常规修复和CMT电弧增材修复两种不同方式下的温度场与应力场,对比分析两种修复方式的应力分布规律。结果表明,相比于环焊应力场,两种修复方式的最大等效应力均增大,其中,常规修复的等效应力最大值达551 MPa,CMT电弧增材修复为512 MPa,后者高应力区面积更小;CMT电弧增材修复的峰值温度(794℃)高于常规修复(539℃)温度,高温停留缓解了拘束效应,使轴向拉应力分量最大值(438 MPa)较常规修复(524 MPa)降低16.4%。CMT电弧增材修复可有效降低焊缝区域残余应力及开裂风险,可以用于管道修复。
In order to solve the problems of large heat input and residual stress concentration in the traditional pipeline ring welding repair process,a three⁃dimensional thermal structural coupling model was established using ANSYS to simulate the temperature and stress fields under two different methods of conventional repair and CMT arc additive repair,and compare and analyze the stress distribution laws of the two repair methods.The results showed that compared with the stress field of ring welding,the maximum equivalent stress of both repair methods increased.Among them,the maximum equivalent stress of conventional repair reached 551 MPa,while that of CMT arc additive repair was 512 MPa,with the latter having a smaller high stress zone area.The peak temperature of CMT arc additive repair(794℃)is higher than that of conventional repair(539℃),and the high⁃temperature retention alleviates the confinement effect,reducing the maximum axial tensile stress component(438 MPa)by 16.4%compared to conventional repair(524 MPa).CMT arc additive repair can effectively reduce residual stress and cracking risk in the weld area,and can be used for pipeline repair.
作者
胥钦淏
张延斌
张林杰
XU Qinhao;ZHANG Yanbin;ZHANG Linjie(Xi'an University of Architecture and Technology,Xi'an 710311,China;State Key Laboratory for Mechanical Behavior of Materials,Xi'an Jiaotong University,Xi'an 710049,China)
出处
《焊管》
2025年第8期106-113,共8页
Welded Pipe and Tube
关键词
X80管线钢
CMT电弧增材
环焊缝修复
数值模拟
残余应力
X80 pipeline steel
CMT(cold metal transfer)arc additive manufacturing
girth weld repair
numerical simulation
residual stress
