某成品油管道环焊缝泄漏原因分析  

Analysis of a Product Oil Pipeline Girth Weld Leakage

作　　者：刘奎荣 任国琪 王高峰 张皓 LIU Kuirong;REN Guoqi;WANG Gaofeng;ZHANG Hao(Petrochina Southwest Pipeline Branch,Chengdu 610041,China;CNPC Tubular Goods Research Institute,Xi’an 710077,China)

机构地区：[1]中国石油西南管道公司,成都610041 [2]中国石油集团石油管工程技术研究院,西安710077

出　　处：《焊管》2021年第6期31-35,共5页Welded Pipe and Tube

摘　　要：为了探究某成品油管道运行过程中发生泄漏的原因,通过宏观观察、无损检测、力学性能分析、金相分析、扫描电镜及能谱分析等手段,对失效试样进行了分析。结果显示,泄漏失效裂纹位于环焊缝起弧、收弧处。研究表明,导致钢管泄漏失效的原因是环焊缝存在焊接热裂纹,且环焊缝内表面成型不良,在长期服役过程中,受内、外载荷影响,位于焊瘤附近的焊接热裂纹产生应力集中,发生扩展导致环焊缝泄露失效。In order to find out the causes of the leakage failure occurred during the operation of a product oil pipeline,through macroscopic observation,nondestructive testing,mechanical property analysis,metallographic analysis,scanning electron microscopy and energy spectrum analysis,the leakage failure crack occurs at the arc starting and ending points of the girth weld.The research shows that the reason for the failure of steel pipe leakage is that there is thermal crack in the welding of the girth weld and the forming of the inner surface of the girth weld is poor.In the long-term service,affected by internal and external loads,the welding thermal cracks near the weld beading generate stress concentration,and the expansion leads to the leakage failure of the girth weld.

关 键 词：环焊缝 泄漏失效 热裂纹 焊瘤 

分 类 号：TG115.5[金属学及工艺—物理冶金]