X80M钢螺旋埋弧焊管自动焊对接环焊缝出现裂纹的原因
Cause of Cracks in Automatic Welding Butt Girth Weld of X80M Steel Spiral Submerged Arc Welded Pipe
摘 要
通过对某天然气输送管线2道X80M钢螺旋埋弧焊管自动焊对接环焊缝的化学成分、力学性能、显微组织与断口形貌等进行分析，探讨了环焊缝中出现埋藏型裂纹的原因。结果表明：环焊缝中的裂纹位于填充焊左、右两侧坡口熔合线处；在填充焊过程中，铜质导电嘴与焊缝坡口接触导致短路，短路电流产生的高温使导电嘴与坡口接触部分熔化，随后熔合在坡口处的金属铜随焊丝一起熔入到环焊缝填充焊金属中，并沿母材和焊缝晶界发生扩散而形成铜富集区，最终导致环焊缝发生熔铜开裂。
对接环焊缝
熔铜开裂
X80M steel
butt girth weld
molten copper cracking
Abstract
By the analysis of the chemical composition, mechanical properties, microstructure and fracture morphology of the automatic welding butt girth weld of two X80M steel spiral submerged arc welded pipes in a natural gas transmission pipeline, the causes of buried cracks in the girth weld were discussed. The results show that the cracks in the girth welds were located at the fusion line of the groove on the left and right sides of the filler weld. During filler welding, the contact between the copper contact tube and the weld groove led to short circuit; the high temperature generated by the short-circuit current resulted in the melting of the contact part between the contact tube and the groove; the metal copper fused at the groove was fused into the filler metal of the girth weld with the welding wire, and diffused along the base metal and weld grain boundary to form a copper enrichment zone, which finally led to the molten copper cracking of the girth weld.
中图分类号 TG457.6 DOI 10.11973/jxgccl202111013
所属栏目 失效分析
基金项目
收稿日期 2020/9/23
修改稿日期 2021/9/24
网络出版日期
作者单位点击查看
备注李亮(1982-),男,四川都江堰人,高级工程师,硕士
引用该论文: LI Liang,HUANG Lei,LIU Long,FENG Zhenjun,XU Yan,BAI Qiang,NIE Xianghui. Cause of Cracks in Automatic Welding Butt Girth Weld of X80M Steel Spiral Submerged Arc Welded Pipe[J]. Materials for mechancial engineering, 2021, 45(11): 68～75
李亮,黄磊,刘陇,丰振军,许彦,白强,聂向晖. X80M钢螺旋埋弧焊管自动焊对接环焊缝出现裂纹的原因[J]. 机械工程材料, 2021, 45(11): 68～75
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【4】戴联双, 考青鹏, 杨辉, 等.高强度钢管道环焊缝隐患治理措施研究[J]. 石油管材与仪器, 2020, 6(2):32-37. DAI L S, KAO Q P, YANG H, et al. Hazard control measurement of girth weld in high strength steel pipeline[J]. Petroleum Tubular Goods & Instruments, 2020, 6(2):32-37.
【5】杨辉, 王富祥, 陈健, 等.油气管道环焊缝缺陷适用性评价现状与展望[J]. 天然气工业, 2020, 40(2):135-139. YANG H, WANG F X, CHEN J, et al. Current status and prospect of fitness-for-service evaluation on the girth weld defects in oil and gas line pipes[J]. Natural Gas Industry, 2020, 40(2):135-139.
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