双光束能量比对Q355ND钢激光MAG复合焊接头组织性能的影响  

Effect of Dual-Beam Energy Ratio on Microstructure and Properties of Q355ND Steel Laser-MAG Hybrid Welding Joint

作　　者：尹燕[1] 张潇 肖梦智 龚岩 周炜 张瑞华 Yin Yan;Zhang Xiao;Xiao Mengzhi;Gong Yan;Zhou Wei;Zhang Ruihua(State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals,Lanzhou University of Technology,Lanzhou 730050,Gansu,China;China Iron&Steel Research Institute Group,Beijing,100081,China;Yangjiang Hardware Knife Cut Industrial Technology Research Institute,Yangjiang 529533,Guangdong,China)

机构地区：[1]兰州理工大学省部共建有色金属先进加工与再利用国家重点实验室,甘肃兰州730050 [2]中国钢研科技集团有限公司,北京100081 [3]阳江市五金刀剪产业技术研究院,广东阳江529533

出　　处：《激光与光电子学进展》2022年第17期209-216,共8页Laser & Optoelectronics Progress

基　　金：国家自然科学基金(52161007);2018广东省科技计划项目(20180902);阳江市科技计划项目(SDZX2020009)。

摘　　要：采用高功率双光束激光-金属活性气体(MAG)复合焊接技术对Q355ND钢进行焊接。通过调整双光束能量比分析激光能量密度分布对焊缝横截面成形、熔深及熔宽的影响,并获得了27 mm厚板“Y”型单面焊双面成型良好的对接接头。然后分析了焊缝区、热影响区的显微组织和主要元素分布,测定了焊接接头的显微硬度。试验结果表明,随着激光能量比的增大,焊缝熔深表现为先减小后增大的变化趋势,能量比的变化对熔宽影响较小,在激光能量比为0.75时获得了最深的焊缝熔深。通过调整能量比,所焊接的对接接头焊缝显微组织主要为铁素体和贝氏体。在焊接接头熔合线附近元素均匀分布,未出现元素迁移现象。硬度峰值出现在靠近熔合线热影响区附近,焊缝区硬度明显高于母材,热影响区硬度随着与焊缝中心距离的增加而逐渐减小。We investigated the effect of dualbeam energy ratio on the microstructure and properties of Q355ND steel lasermetal active gas(MAG)hybrid welding joint.Here,the Q355ND steel was welded using highpower dualbeam laserMAG hybrid welding.Subsequently,we analyzed the effect of laser energy density distribution on weld cross section forming,weld penetration depth,and weld width by adjusting the energy ratio of dualbeam and obtained the wellformed butt joint of 27 mm thick plate Ytype single side welding.Furthermore,we analyzed the microstructure and distribution of the main elements of the welding seam,weld zone,and heataffected zone,and measured the microhardness of the welded joint.Results show that the weld penetration depth first decreases and then increases with increasing laser energy ratio.Additionally,the change in the energy ratio has insignificant effect on the weld width,and the deepest weld penetration depth is obtained when the laser energy ratio is 0.75.Moreover,the microstructure of the butt joint welded with the optimum energy ratio is mainly ferrite and bainite,and the elements are evenly distributed near the fusion line of the welded joint without element migration.The hardness peak near the heataffected zone of the fusion line and that of the weld zone was considerably higher than that of the base metal.The hardness of the heataffected zone decreased with the increasing distance from the weld center.

关 键 词：激光技术 高功率激光 双光束复合焊接 能量比 焊缝成形 显微组织 性能 

分 类 号：TG456.[金属学及工艺—焊接]