X70螺旋缝焊管焊缝横向裂纹分析  

Analysis on Transverse Crack of X70 SAWH Pipe Weld

作　　者：王高峰 王晓江 梅滨 李保亮 张洪蔚 杨专钊 吴金辉 李安强 

机构地区：[1]中国石油集团石油管工程技术研究院,西安710065 [2]北京隆盛泰科石油管工程科技有限公司,北京100101 [3]云南昆钢制管有限公司,云南玉溪653106

出　　处：《焊管》2013年第3期39-44,共6页Welded Pipe and Tube

摘　　要：动载荷条件下服役的管道,裂纹尖端会产生应力集中,且有很强的扩张延伸趋势,给管线的安全运行带来隐患。通过化学分析、力学性能试验、金相组织分析、断口电镜扫描分析以及能谱分析等对某钢管厂生产的螺旋焊管出现的内焊缝横向裂纹产生的原因进行了分析。分析结果表明,裂纹产生的原因是由于焊缝中存在氧化物夹杂裂纹源,且内焊缝组织存在淬硬组织,在较大的残余应力下产生开裂。最后,提出了预防类似裂纹产生的建议。For pipeline serving under the condition of dynamic load, the crack tip will generate stress concentration , and it is with expansion and extension trend, which will form hidden danger for pipeline safe operation. In this article, the reason caused transverse crack in inside weld of SAWH pipe, which produced in certain pipe factory, was analyzed by chemical analysis, mechanical performance test, scanning electron microscope （SEM） and energy spectrum analysis（EDS）. The results showed the oxide inclusion existed in weld and quenched structure existed in inside weld, which will cause cracking under major residual stress. In addition, it propounded the suggestions for preventing the similar cracks.

关 键 词：螺旋焊管 焊接裂纹 淬硬组织 残余应力 夹杂物 

分 类 号：TE973[石油与天然气工程—石油机械设备]