摘要
试验采用激光填丝焊接方法对低合金高强钢进行焊接,利用高速摄像研究了激光功率、送丝速度和离焦量等工艺参数对焊接过程稳定性的影响,并以优化的工艺参数获得了良好的焊接接头。结果表明:减小激光功率或增加送丝速度都能降低气孔率;当离焦量为0 mm时,气孔率最低。焊接稳定性依赖于熔滴过渡模式,当熔滴过渡模式为液桥过渡时,激光填丝焊接稳定性得到改善。激光填丝焊接接头的丝材熔化区为奥氏体和马氏体双相组织,激光作用区为马氏体单相组织,激光区显微硬度高于丝材熔化区。
The low-alloy high-strength steel was welded by the laser wire filler welding, and the effects of laser power, wire feeding speed and defocus amount on the stability of the welding process were studied by high-speed camera, and a good welded joint was obtained with optimized process parameters. The results show that reducing the laser power or increasing the wire feed speed can reduce the porosity;When the defocus amount is 0 mm, the porosity is the lowest. The welding stability depends on the droplet transfer mode. When the droplet transfer mode is liquid bridge transfer, the welding stability of laser wire filling is improved. The wire melting zone of the laser wire filling welding joint is austenite and martensite dual-phase structure, and the laser action zone is a martensite single-phase structure. The microhardness of the laser zone is higher than that of the wire melting zone.
作者
郭紫威
韩荧
Guo Ziwei;Han Ying(Automobile Application College,Changchun Automobile Industry Institute,Changchun,Jilin 130013,China)
出处
《应用激光》
CSCD
北大核心
2022年第4期7-13,共7页
Applied Laser
基金
吉林省职业教育与成人教育教学改革研究课题(2020ZCY199)。
关键词
激光填丝焊
低合金高强钢
熔滴过渡
微观组织
laser wire filling welding
low alloy high strength steel
droplet transfer
microstructure
