| 天然气输送管道环焊缝泄漏失效分析 |
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| 引用本文： | 胡美娟,刘迎来,朱丽霞,齐丽华,杨放.天然气输送管道环焊缝泄漏失效分析[J].焊管,2014(2):56-58,63. |
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| 作者姓名： | 胡美娟 刘迎来 朱丽霞 齐丽华 杨放 |
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| 作者单位： | 中国石油集团石油管工程技术研究院,西安710077 |
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| 摘 要： | 通过断口形貌、金相分析以及力学性能检测等方法对某X80天然气输送管道环焊缝泄漏产生的原因进行了失效分析。分析结果表明,环焊缝焊接接头的拉伸性能符合Q/SY GJX 0110—2007《西气东输二线管道工程线路焊接技术规范》要求,但焊缝和热影响区的冲击性能均未达到焊接技术规范的要求,管道环焊缝泄漏裂纹位于环焊缝6点位置根焊区域,此位置根焊进行过内补焊作业,补焊焊缝焊趾处存在的焊接缺陷是环焊缝开裂泄漏的主要原因。
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| 关 键 词： | X管线钢 环焊缝 微观组织 根焊 补焊 |
Leakage Failure Reason Analysis of Circumferential Weld for Natural Gas Pipeline |
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| HU Meijuan,LIU Yinglai,ZHU Lixia,QI Lihua,YANG Fang.Leakage Failure Reason Analysis of Circumferential Weld for Natural Gas Pipeline[J].Welded Pipe and Tube,2014(2):56-58,63. |
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| Authors: | HU Meijuan LIU Yinglai ZHU Lixia QI Lihua YANG Fang |
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| Affiliation: | (CNPC Tubular Goods Research Institute, Xi＇an 710077, China) |
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| Abstract: | The leakage failure reason of circumferential weld for some X80 natural gas pipeline was analyzed by means of fracture morphology, microstructure observation and mechanical properties tests. The results showed that the tensile performance of welded joint for circumferential weld accord with the requirements of Q/SY GJX 0110-2007 Welding Technology Specification for the Second West-to-East Gas Pipeline Project, and the impact toughness of weld and HAZ both fail to meet the welding requirements of technical specification. The leaking crack of circumferential weld lies in the six position of root welding zone, and repair welding was implemented in the six position of root welding. The main leakage failure reason of circumferential weld was the welding defects close to the toe zone of the repair welding. |
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| Keywords: | X80 pipeline steel circumferential weld microstructure root welding repair welding |
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