不同焊接电流下X80高等级管线钢焊丝熔敷金属的组织及性能研究  

Study on microstructure and properties of deposited metal of X80 high-grade pipeline steel welding wire under different welding currents

作　　者：赖世强[1] 王高见 LAI Shiqiang;WANG Gaojian(College of Materials Science and Engineering of Chongqing University,Chongqing 400044,China;Sichuan Xiye New Material Co.,Ltd.,Chengdu 611730,China)

机构地区：[1]重庆大学材料科学与工程学院,重庆400044 [2]四川西冶新材料股份有限公司,四川成都611730

出　　处：《电焊机》2020年第10期121-124,I0009,共5页Electric Welding Machine

摘　　要：研究了焊接电流对高等级X80专用高效气体保护焊丝熔敷金属的力学性能和组织的影响,为自动焊在高寒地区管道工程中的应用及焊接工艺选择提供基础。结果表明:在150~250 A焊接电流下X80管线钢焊丝(1.0)熔敷金属均具有较好的强韧性;随着焊接电流的增加,焊缝冲击韧性有所降低,焊接电流每提高10 A,-30℃及-50℃冲击功下降4~5 J;焊缝组织以细小铁素体为主,赋予材料优良的强韧特性。The effect of welding current on the mechanical properties and microstructure of deposited metal of high-grade X80 high-efficiency gas shielded welding wire is studied,which provides a basis for automatic welding of pipeline engineering and welding process selection in alpine regions.The results show that under the welding current of 150~250 A,the deposited metal of X80 pipeline steel welding wire(1.0)has good strength and toughness;as the welding current increases,the impact toughness of the weld decreases.For every 10 A increase in welding current,the impact energy at-30℃and-50℃decrease 4~5 J,the microstructure of the weld is mainly composed of fine ferrite,which gives the material excellent toughness characteristics.

关 键 词：焊接电流 X80管线钢 熔敷金属 性能 

分 类 号：TG444.77[金属学及工艺—焊接]