电焊机2017，Vol.47Issue(7)：10-16,7.DOI:10.7512/j.issn.1001-2303.2017.07.03
母材成分对X80管道环焊接头冲击性能的影响
Effect of base metal composition on impact toughness of girth welded joint in X80 pipeline steel
陈延清 1牟淑坤 2刘宏 1张飞虎1
作者信息
- 1. 首钢技术研究院,北京100043
- 2. 北京市能源用钢工程技术研究中心,北京100043
- 折叠
摘要
Abstract
The self-shielded flux-cored wire and semi-automatic welding technology are used in the process of pipe laying to study the effect of Nb content of base metal on the microstructure and impact toughness of girth welded joint in X80 pipeline steel.The results show that composition of base metal has impact on the composition of weld metal.The higher Nb content of base metal transfers to weld metal after weld thermal cycle,which promotes the formation and content of M/A constituent elements.The M/A effect constituent elements distributing along the grain boundary reduce the impact absorbing energy of weld metal,and affect the impact toughness and stability of weld metal.By optimizing the welding condition,controlling the microstructure and appearance of weld metal as well as the content and distribution of M/A,the impact toughness of X80 self-shielded flux-cored wire weld metal can be maintained a high and relatively stable level,but its procedure window is narrow.关键词
环焊缝/自保护药芯焊丝/冲击韧性/工艺窗口Key words
welding heat input/self-protection flux cored wire/impact toughness/procedure window分类
矿业与冶金引用本文复制引用
陈延清,牟淑坤,刘宏,张飞虎..母材成分对X80管道环焊接头冲击性能的影响[J].电焊机,2017,47(7):10-16,7.
