高钢级油气管道环焊缝接头性能及质量控制

在介绍管道环焊缝特点及重要性的基础上,分析了典型化学成分X80钢管自保护药芯焊丝半自动焊(FCAW-S)和熔化极气体保护焊(GMAW)环焊缝接头的关键力学性能。结果表明,无论采用FCAW-S还是GMAW方法并匹配相应级别焊丝进行环焊缝焊接,其接头的抗拉强度均满足标准要求。FCAW-S和GMAW环焊接头热影响区的韧性分散性大于焊缝,但是FCAW-S环焊接头焊缝的冲击吸收能量容易出现低值而导致不满足标准要求,而GMAW环焊接头焊缝和热影响区的冲击韧性均满足标准要求。强度匹配和焊接缺陷对管道环焊缝接头性能和承载能力有重要影响。为了保证管道运行安全,需要加强环焊缝焊接质量控制。

Performance and Quality Control of High Strength Pipeline Girth Weld Joints

On the basis of introducing the characteristics and importance of girth welds of pipelines,the key mechanical properties of FCAW-S and GMAW girth welded joints of X80 steel pipe with typical chemical composition were analyzed.The results show that the tensile strength of the girth welded joints can meet the requirements of the standard no matter whether FCAW-S or GMAW method is adopted and matched with the corresponding grade wires.The toughness dispersion of HAZ of FCAW-S and GMAW girth welded joints is greater than that of weld,but the impact absorbed energy of FCAW-S girth welded joints is easy to be low,which leads to failure to meet the standard requirements,while the impact toughness of weld and HAZ of GMAW girth welding joints is better.Strength matching and welding defects have important effects on the performance and bearing capacity of girth weld joints of pipelines.In order to ensure the safety of pipeline operation,it is necessary to strengthen the quality control of girth welding.