Study on flow behavior and weld forming of 304 stainless steel by scanning laser welding

304不锈钢扫描激光焊接的熔池流动行为及焊缝成形研究 Study on flow behavior and weld forming of 304 stainless steel by scanning laser welding 谢小珑 XIE Xiaolong 1 first-author 李权洪 LI Quanhong 1 母中彦 MU Zhongyan 1 黄安国 HUANG Anguo 1 corresp huang-anguo@mail.hus 华中科技大学材料成形与模具技术国家重点实验室 华中科技大学材料成形与模具技术国家重点实验室 State Key Laboratory of Materials Processing and Die & Mould Technology,Huazhong University of Science and Technology State Key Laboratory of Materials Processing and Die & Mould Technology,Huazhong University of Science and Technology 针对304不锈钢扫描激光焊接过程中的熔池流动行为及焊缝成形进行了实验和模拟研究。在研究中,通过考虑了小孔效应的三维瞬态模型和高速摄像平台研究熔池的流动行为,结果表明:在焊接过程中,小孔会推动熔融金属垂直于焊接方向流动,当熔融金属撞击熔池侧壁时,存在溢出熔池的现象,当扫描频率过高时,还会产生熔池飞溅的缺陷。此外,对不同扫描频率和不同扫描宽度下的焊缝形貌进行了对比分析。结果表明:当扫描幅度及其他参数一定时,较低的扫描频率对母材的作用效果更强烈;当扫描频率及其他参数一定时,较小的扫描幅度对母材的作用效果更强烈。 In this paper,experimental and simulation studies are conducted on the flow behavior and weld forming of304 stainless steel in the scanning laser welding process. In this study,the flow behavior of the molten pool is studied by using a three-dimensional transient model with keyhole effect and a high-speed camera platform. The results show that in the welding process,the holes will push the molten metal to flow perpendicular to the welding direction. When the molten metal hits the side wall of the molten pool,there will be overflow of the molten pool. When the scanning frequency is too high,the molten pool will splash. In addition,the morph-ologies of welding seams with different scanning frequencies and widths are compared and analyzed. The results show that when the scanning amplitude and other parameters are fixed,the lower scanning frequency has stronger effects on the base material. When the scanning frequency and other parameters are fixed,smaller scanning amplitude has stronger effects on the parent material. 激光焊接 光束扫描 数值模拟 熔池流动 小孔效应 laser welding beam oscillation numerical simulation molten pool flow keyhole effect TG456.7 国家重点研发计划项目(2017YFE0100100) 2022-03-08 1 51