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HE Xiaodong, HUO Chunyong, LU Caihong, TONG Ke, SONG Juan. Morphology and causes of cold crack in tack and finish weld of X90 high strength pipeline steel[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2017, 38(7): 86-90. DOI: 10.12073/j.hjxb.20150724001
Citation: HE Xiaodong, HUO Chunyong, LU Caihong, TONG Ke, SONG Juan. Morphology and causes of cold crack in tack and finish weld of X90 high strength pipeline steel[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2017, 38(7): 86-90. DOI: 10.12073/j.hjxb.20150724001

Morphology and causes of cold crack in tack and finish weld of X90 high strength pipeline steel

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  • Received Date: July 23, 2015
  • The crack morphology of X90 pipeline steel weld, made by tack and finish welding, was investigated by mechanical test, microstructure analysis, SEM and EDS. Furthermore, the causes of the crack were analyzed. The results show that the transversal cracks in the inner weld bead of X90 helical welded pipe are cold crack, that initiated and grew transgranularly or along the grain boundary in the weld. The X90 steel contains a lot alloying elements such as Mn, Cr, Mo, Ni and Cu, and its strength is high. So the welding residual stress is larger than the crack critical stress. The Vickers hardness in the inner weld bead is higher than that in the outer weld bead, and the distribution of hardness on two sides of weld is very asymmetry. These results led to stress concentration and unbalance of distribution in the welded joints. Diffusible hydrogen, which highly existed in the overlap regions of inner and outer weld bead, escaped hardly from the weld metal. Therefore, the diffusible hydrogen gathered in the trap of weld defects such as gas hole and slag. This resulted in forming of cracks and lots of white splotches on the fracture surface. The continuous and elongated dendrite grain boundary, which was formed in the first crystallized microstructure of weld metal, provided a channel for the growth of crack.
  • 严春妍,李午申,冯灵芝,等.X100级管线钢及其焊接性[J].焊接学报,2007,28(10): 105-108.Yan Chunyan,Li Wushen,Feng Lingzhi,etal.Review of X100 pipeline steel and its field weldability[J].Transactions of the China Welding Institution,2007,28(10): 105-108.[2] 夏佃秀,王学林,李秀程,等.X90级别第三代管线钢的力学性能与组织特征[J].金属学报,2013,49(3): 271-276.Xia Dianxiu,Wang Xuelin,Li Xiucheng,etal.Properties and microstructure of third generation X90 pipeline steel[J].Acta Metallurgica Sinica,2013,49(3): 271-276.[3] 李继红,杨 亮,陈飞绸,等.X100管线钢双丝埋弧焊接头微观组织与力学性能[J].焊接学报,2013,34(10): 27-30.Li Jihong,Yang Liang,Chen Feichou,etal.Microstructure and mechanical properties of welding joints of X100 line pipe by double-wire submerged arc welding[J].Transactions of the China Welding Institution,2013,34(10): 27-30.[4] 刘成坤,陈 铭.预精焊高速螺旋成型稳定性的影响因素与控制[J].焊管,2015,38(4): 52-56.Liu Chengkun,Chen Ming.Influnce factors and control of high-speed helical forming stability with two-step welding process[J].Welded Pipe and Tube,2015,38(4): 52-56.[5] 王凤成,崔晓峰,王国胜,等.螺旋缝焊管预焊缺陷对精焊质量的影响与控制[J].钢管,2012,41(2):49-52.Wang Fengcheng,Cui Xiaofeng,Wang Guosheng,etal.Influnce by pre-welding defect of helical welded pipe on finish welding quality and relevant control measures[J].Steel Pipe,2012,41(2):49-52.[6] 李亚娟,李午申,谢 琦.Nb-Mo系X80管线钢焊接冷裂纹敏感性的研究与预测[J].焊接学报,2010,31(5): 105-108.Li Yajuan,Li Wushen,Xie Qi.Research and predication on cold cracking susceptibility of Nb-Mo X80 pipeline steel[J].ransactions of the China Welding Institution,2010,31(5): 105-108.[7] 张 君,牛 辉.X100管线钢冷裂纹敏感性研究[J].焊管,2011,34(12): 21-26.Zhang Jun,Niu Hui.Study on cold cracking sensitivity of X100 grade pipeline steel[J].Welded Pipe and Tube,2011,34(12): 21-26.[8] 张克修,吴金辉,王树人.X80螺旋埋弧焊管焊缝横向裂纹产生原因及预防措施[J].焊管,2010,33(8): 10-13.Zhang Kexiu,Wu Jinhui,Wang Shuren.Causes and preventive measures for transverse cracks of X80 SAWH pipe[J].Welded Pipe and Tube,2010,33(8): 10-13.[9] 王高峰,王晓江,梅 滨,等.X70螺旋缝焊管焊缝横向裂纹分析[J].焊管,2013,36(3): 39-44.Wang Gaofeng,Wang Xiaojiang,Mei Bin,etal.Analysis on transverse crack of X70 SAWH pipe weld[J].Welded Pipe and Tube,2013,36(3): 39-44.[10] 高惠临.管线钢——组织性能焊接行为[M].西安: 陕西科技出版社,1995.[11] 熊庆人,李 霄,霍春勇,等.三种高钢级大直径焊管残余应力分布规律研究[J].焊管,2011,34(3): 12-17.Xiong Qingren,Li Xiao,Huo Chunyong,etal.Research on residual stress distribution rule of 3 kinds of large diameter welded pipe with high grade[J].Welded Pipe and Tube,2011,34(3): 12-17.
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