550 MPa级免涂装高性能耐候桥梁用气保焊丝钢研制  

Development of 550 MPa Grade Coating Free High Performance Weathering Resistant Gas Shielded Welding Wire Steel for Bridges

作　　者：王磊 陈洋 WANG Lei;CHEN Yang(Nanjing Iron and Steel Co.,Ltd.,Nanjing 210035,Jiangsu,China)

机构地区：[1]南京钢铁股份有限公司,江苏南京210035

出　　处：《热处理技术与装备》2025年第1期51-55,共5页Heat Treatment Technology and Equipment

摘　　要：通过合理设计焊丝成分,研制高性能耐候桥梁用气保焊丝,其焊缝熔敷金属的耐大气腐蚀指数I≥6.5,可适应较宽范围热输入(10~25 kJ/cm)的焊接,焊缝成形良好,且-4℃冲击性能KV2≥80 J、拉伸性能Rm≥550 MPa。研制的焊丝用于高性能耐候桥梁钢板焊接的典型接头,经周期浸润加速腐蚀试验,其腐蚀失重率与母材相当,相对腐蚀率≤6%。研制的焊丝能够满足高性能Q345qENH~Q420qENH级免涂装高性能耐候钢桥的设计和制造要求。The high performance weathering resistant gas shielded welding wire for bridges has been developed through reasonable design of welding wire composition.The atmospheric corrosion resistance index I of the deposited metal in the weld seam is≥6.5,which can adapt to welding with a wide range of heat input(10-25 kJ/cm).The weld seam has good formability,the-40℃impact performance KV2≥80 J and tensile performance Rm≥550 MPa.The developed welding wire is used for typical joints of high performance weather resistant bridge steel plates.After cyclic immersion accelerated corrosion tests,the corrosion weight loss rate is equivalent to that of the base material,with a relative corrosion rate is≤6%.The developed welding wire can meet the design and manufacturing requirements of high performance weather resistant steel bridges with Q345qENH to Q420qENH grades without coating.

关 键 词：熔敷金属 焊接接头 耐候钢 热输入 

分 类 号：TG457.11[金属学及工艺—焊接]