Study on arc characteristics and weld appearance of lasertwinarc-GTAW hybrid welding  

作　　者：Bo Wang Hongtao Zhang Jian Sang 

机构地区：[1]School of Mechanical Engineering,Yanshan University,Qinhuangdao 066004,China [2]State Key Laboratory of Advanced Welding and Joining,Harbin Institute of Technology,Harbin 150001,China [3]Shandong Provincial Key Laboratory of Special Welding Technology,Harbin Institute of Technology at Weihai,Weihai 264209,China

出　　处：《China Welding》2025年第1期12-27,共16页中国焊接(英文版)

基　　金：supported by the Industrial Innovation Major Technology Global Unveiling Project of Jining City(2022JBZP004);Taishan Scholars Project.

摘　　要：Laser twin-arc GTAW(LTA-GTAW)process has been developed by using the synergic interaction effects of laser and a coupled arc in a weld pool to achieve higher energy efficiency.In this study,bead-on-plate welding was conducted on 8-mm-thick Q235B work-pieces to investigate the variation of hybrid arc profile,the influence of hybrid arc profile on weld forming,microstructure and mech-anical properties of the joint during the LTA-GTAW process.The influence of Laser-GTAW and LTA-GTAW methods on weld surface appearance,heat input per unit length,and weld metal microstructure were also demonstrated systematically.The LTA-GTAW can make the distribution of arc energy more reasonable in welding depth and width.When defocus is 0,I_(f)is 330 A,I_(b)is 240 A,laser power is 2.4 kW,and spacing between heat sources of tungsten electrode is 10 mm,the weld shape is better.Compared with Laser-GTAW,LTA-GTAW can achieve lower heat input at the same penetration depth,and the microstructure of the weld is refined.The tensile strength of the welded joint is 121.8%of the base material,and the fracture mode of the welded joint is ductile fracture,the comprehensive mechanical properties are better.

关 键 词：Hybrid welding Twin-arc gas tungsten arc welding Laser welding Arc profile Microstructure 

分 类 号：TG456.7[金属学及工艺—焊接]