管道环焊缝附近母材缺陷剖析  

Analysis of Defects in Vicinity of Steel Pipe Girth Weld

作　　者：王长安[1,2] 王高峰[1,2] 余国民[1,2] 刘迎来[1,2] 许彦[1,2] WANG Chang- an WANG Gao- feng YU Guo- min LIU Ying- lai XU Yan(Tubular Goods Research Center of CNPC, Xi＇an 710077, China Beijing Longshine Oil Tubular Technology Co. , Ltd. , Beijing 100101, China)

机构地区：[1]中国石油集团石油管工程技术研究院,陕西西安710077 [2]北京隆盛泰科石油管科技有限公司,北京100101

出　　处：《压力容器》2017年第7期50-55,共6页Pressure Vessel Technology

摘　　要：某长输管线工程施工建设中,对管道环焊缝进行X射线检测时,在1500多道环焊缝底片中发现有20道环焊缝附近的母材上存在疑似圆形缺陷,其中7道环焊缝母材附近的疑似圆形缺陷超标。通过现场勘查、金相分析、电镜及能谱分析对疑似缺陷进行了剖析,分析结果认为,该缺陷产生的原因是由于工件端焊接电极与钢管接触不良从而导致电弧放电,使得缺陷部位金属经历了高温熔化后重新结晶,在此过程中,产生了内部气孔。并对此提出相关建议,以供同行参考。When the X -ray inspection of the girth weld was carrying out in a pipeline construction project, in the 1500 girth weld X -film found in 20 girth weld near the metal on the existence of suspected defects which 7 defects exceed the standard. Through field investigation, metallographic analysis, SEM and energy spectrum analysis to analyze the suspected defect, according to the analyzing results, the causes are due to the end of the welding electrode and the steel pipe leading to poor contact arc discharge, the internal pores was produced when the defective parts of metal experienced high temperature melting and then re-crystallization. Some suggestions are put forward for reference.

关 键 词：母材 环焊缝 气孔 焊接电极 电弧 

分 类 号：TH49[机械工程—机械制造及自动化] TG113.26[金属学及工艺—物理冶金]