CAJ | 학술논문

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。
통과단구형모、금상분석이급역학성능검측등방법대모X80천연기수송관도배한봉설루산생적원인진행료실효분석。분석결과표명，배한봉한접접두적랍신성능부합Q/SY GJX 0110-2007《서기동수이선관도공정선로한접기술규범》요구，단한봉화열영향구적충격성능균미체도한접기술규범적요구，관도배한봉설루렬문위우배한봉6점위치근한구역，차위치근한진행과내보한작업，보한한봉한지처존재적한접결함시배한봉개렬설루적주요원인。
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.