工艺参数对激光-MAG电弧复合打底焊焊缝成形的影响  

Study on the Influence of Process Parameters on the Weld Formation of Laser-MAG Hybrid Backing Welding

作　　者：毕学松 侯艳喜 尚鹏 李志波 Bi Xuesong;Hou Yanxi;Shang Peng;Li Zhibo(Tangshan Kaiyuan Welding Automation Technology Institute Co.,Ltd.,Tangshan 063000,Hebei,China;Innovation Center of Hebei Province for Welding Automation Equipment System Technology,Tangshan 063000,Hebei,China)

机构地区：[1]唐山开元焊接自动化技术研究所有限公司,河北唐山063000 [2]河北省焊接自动化装备系统技术创新中心,河北唐山063000

出　　处：《应用激光》2024年第9期54-62,共9页Applied Laser

基　　金：河北省重点研发计划项目(22341801D、23311802D)。

摘　　要：以12 mm厚的Q345B碳钢板为材料,通过调整焊接电流、激光功率、焊接速度等工艺参数,进行系列激光-MAG电弧复合打底焊试验,认识工艺参数其对焊缝成形的影响规律。结果表明,在激光功率4.0~4.5 kW,焊接电流200~280 A,焊接速度1.0 m/min的工艺参数下,可实现全熔透打底焊;焊缝成形良好,焊缝宏观检测未见气孔和裂纹等缺陷,焊接电流较大时焊缝成形更饱满;焊接工艺可适应最大间隙1 mm,错边1.5 mm的组对条件;焊接接头抗拉强度优于母材,弯曲性能良好,满足工程应用要求。This study investigates the effects of process parameters,including welding current,laser power,and welding speed,on the weld formation in laser-MAG hybrid backing welding of 12 mm thick Q345B test plates.A series of experiments were conducted to determine the optimal parameters for achieving full penetration backing welds.The results show that full penetration can be achieved with laser power set between 4.0 to 4.5 kW,welding current ranging from 200 A to 280 A,and a welding speed of 1.0 m/min.Under these conditions,the weld formation was satisfactory,with no detectable defects such as pores or cracks.It was observed that a higher welding current resulted in a fuller weld formation.The welding process demonstrated adaptability to mismatch conditions,accommodating gaps up to 1 mm and staggering of 1.5 mm.The tensile strength of the welded joints exceeded that of the base metal,and the bending performance was satisfactory,fulfilling the criteria for engineering applications.

关 键 词：激光-MAG复合焊 打底焊 Y形坡口 焊缝成形 

分 类 号：TG456.7[金属学及工艺—焊接]