摘要
为了研究X80钢级焊管多丝焊接头热影响区软化现象,采用显微硬度分析了X80钢级直缝多丝埋弧焊管焊接接头的硬度分布规律,对焊接接头进行硬度试验、拉伸试验及ABAQUS有限元模拟分析。结果表明,热影响区存在明显的软化区,软化程度为14%,拉伸过程中热影响区存在明显的应变集中情况,最终在热影响区发生断裂;随着软化区宽度增大,焊管承压能力下降,但是当软化宽度为20 mm时,仍未达到承载极限;在实际软化宽度情况下,软化程度增加至50%仍未达到软化区屈服强度。采用本研究中四丝内焊+五丝外焊工艺焊接的接头虽然存在明显软化,但其承载能力仍然远高于工作压力,不影响管段的承载能力。
In order to study the softening phenomenon of heat affected zone of X80 steel grade welded pipe multi wire welded joint,the hardness distribution law of X80 steel grade longitudinal pipe multi wire submerged arc welded pipe welded joint was analyzed by microhardness.The hardness test,tensile test and ABAQUS finite element simulation analysis were carried out on the welded joint.The results show that there is an obvious softening zone in the heat affected zone,and the softening degree is 14%.There is an obvious strain concentration in the heat affected zone during the tensile process,and finally fracture occurs in the heat affected zone.With the increase of softening zone width,the bearing capacity of welded pipe decreases,but when the softening width is 20 mm,it still does not reach the bearing limit.In the case of actual softening width,the softening degree increases to 50%and still does not reach the yield strength of softening zone.Although the joint welded by the four wire internal welding+five wire external welding process in this study has obvious softening,its bearing capacity is still much higher than the working pressure,which does not affect the bearing capacity of the pipe section.
作者
刘斌
刘云
牛辉
韦奉
李霄
LIU Bin;LIU Yun;NIU Hui;WEI Feng;LI Xiao(Baoji Petroleum Steel Pipe Co.,Ltd.,Baoji 721008,Shaanxi,China;Chinese National Engineering Research Center for Petroleum and Natural Gas Tubular Goods Co.,Ltd.,Baoji 721008,Shaanxi,China;School of Materials Science and Engineering,Xi’an Shiyou University,Xi’an 710065,China)
出处
《焊管》
2021年第12期1-6,共6页
Welded Pipe and Tube
基金
国家重点研发计划项目“高应变海洋管线管研制”(项目编号2018YFC0310300)。
关键词
X80
焊接
热影响区
软化
承载能力
X80
welding
heat affected zone
softening
bearing capacity
