环焊缝余高及热影响区宽度对管道环焊接头轴向承载能力的影响  

Influence of Circumferential Weld Reinforcement and HAZ Width on Axial Bearing Capacity of Girth Welding Joint of Pipeline

作　　者：何小东 李为卫 吉玲康 郭忠平 HE Xiaodong;LI Weiwei;JI Lingkang;GUO Zhongping(State Key Laboratory for Performance and Structure Safety of Petroleum Tubular Goods and Equipment Materials,CNPC Tubular Goods Research Institute,Xi′an,Shaanxi 710077,China;Gas Production Plant 2 of PetroChina Changqing Oilfield Company,Yulin,Shaanxi 719000,China)

机构地区：[1]中国石油集团工程材料研究有限公司,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,陕西西安710077 [2]中国石油长庆油田分公司第二采气厂,陕西榆林719000

出　　处：《石油管材与仪器》2022年第4期32-36,共5页Petroleum Tubular Goods & Instruments

基　　金：国家重点研发计划项目“L485高应变海洋管道环焊材料及工艺技术”(编号:2018YFC0310305)。

摘　　要：以OD559 mm×31.8 mm L485管道为研究对象,采用有限元方法研究了其环焊缝余高和热影响区宽度变化对熔化极气体保护焊(GMAW)环焊接头的轴向承载能力影响。研究结果表明,当环焊缝和母材是高强匹配时,GMAW环焊接头的轴向极限载荷和轴向平均应变随HAZ宽度增大而减小,失效位置由管体转移到热影响区。当HAZ宽度小于2 mm时,即使HAZ的强度比母材强度低20%,在拉伸载荷下环焊接头的轴向应变也主要发生在母材。环焊缝余高高度和宽度增加对GMAW环焊接头轴向极限载荷和轴向平均应变影响较小,但较大的焊缝余高高度和宽度会导致管道内壁根焊两侧附近产生较大轴向应力和应变而发生失效。Taking OD559 mm×31.8 mm L485 pipeline as the research object,the influence of weld reinforcement and width of heat affected zone(HAZ)on the axial bearing capacity of GMAW girth welded joint was studied by finite element method.The results show that under the condition of high strength matching,the axial limit load and axial mean strain of GMAW girth welding joint decrease with the increase of HAZ width,and the failure position shifts from pipe body to HAZ.When the width of HAZ is less than 2 mm,the axial strain of the girth welding joint under tensile load mainly occurs in the base metal,even though the strength of HAZ is 20%lower than that of the base metal.The increase of height and width of cap welds has little effect on the axial limit load and axial mean strain of GMAW girth welding joint.But excessive height and width of cap welds will lead to greater axial stress and strain near both sides of root weld of inner wall of pipe and give priority to failure.

关 键 词：焊缝余高 热影响区宽度 管道 环焊接头 轴向承载能力 

分 类 号：TE973[石油与天然气工程—石油机械设备]