摘要
为保障油气输送管道高效安全运行,采用全自动焊工艺(GMAW)和组合自动焊工艺(GTAW+FCAW-G),分别进行2组X80钢级Φ1219 mm×27.5 mm螺旋埋弧焊管的环焊缝焊接,通过对焊接接头的微观组织、强度、冲击韧性和断裂韧性试验分析,研究了不同自动焊工艺下环焊缝接头的组织和性能差异。结果表明,全自动焊环焊缝接头的抗拉强度、屈服强度、冲击韧性和断裂韧性优于组合自动焊焊缝接头;两种自动焊工艺下的焊接接头抗拉强度和屈服强度分别达到680 MPa和600 MPa以上,焊接接头在-10℃下均具有良好的冲击韧性和断裂韧性,韧脆转变温度低于-50℃,CTOD值均大于0.254 mm;两种工艺得到的焊缝组织细小且均匀分布,全自动焊接头组织性能更优。
To ensure the efficient and safe operation of oil and gaspipelines,two sets of X80 grade steel pipes with dimensionsΦ1219 mm×27.5 mm were welded using either the automatic gas metal arc welding(GMAW)process or the combined automatic welding process(GTAW+FCAW-G),respectively.The microstructure,tensile strength,impact toughness,and fracture toughness of the welded joints were analyzed to investigate the differences in structural characteristics and mechanical properties resulting from the different welding techniques.The results indicate that the tensile strength,yield strength,impact toughness,and fracture toughness of the automatic weldinggirth weld joint are superior to those of the combined automatic welding process.The tensile strength and yield strength of the welded joints produced by two automatic welding processes exceed 680 MPa and 600 MPa,respectively.In addition,welded joints have good impact toughness and fracture toughness at-10℃,with a ductile brittle transition temperature below-50℃and CTOD values greater than 0.254 mm.The weld microstructure produced by both processes were fine and uniformly distributed,with the fully automatic welding process demonstrating superior microstructural properties.
作者
杨大慎
刘剑
牛虎理
孙欣妍
张以诺
YANG Dashen;LIU Jian;NIU Huli;SUN Xinyan;ZHANG Yinuo(PipeChina Southwest Pipeline Company,Chengdu 610095,China;CNPC Engineering Technology Research Co.,Ltd.,Tianjin 300451,China;CNPC Key Laboratory of Offshore Engineering,Tianjin 300451,China)
出处
《焊管》
2025年第7期60-66,共7页
Welded Pipe and Tube
基金
国家石油天然气管网集团有限公司科学研究与技术开发项目“管道新型焊接装备研制与应用”(项目编号SJSG202201)。
关键词
X80管道
自动焊
微观组织
韧脆转变
断裂韧度
X80 pipeline
automatic welding
microstructure
ductile brittle transition
fracture toughness
