摘要
将摆动激光与GMAW工艺复合,利用“8”字形摆动激光扫描液态熔池,对其温度场和流场进行调控,以改变熔池温度梯度,主动调控熔池流动以改善焊缝成形.在6061铝合金板材表面进行堆焊试验,重点探究了光丝间距、摆动幅度、激光功率对于焊缝成形的影响,采用高速摄像机拍摄激光扫描熔池过程.结果表明,摆动激光扫描可以有效抑制成形缺陷的发生,当摆动激光扫描熔池中部时可以获得最佳的焊缝成形效果.摆动激光扫描降低了熔池温度梯度分布,同时激光扫描产生的激光蒸发反力可以驱动熔池流动,促进了液态熔池的流动铺展,从而有效抑制了不规则焊缝成形缺陷,减少焊缝内部气孔和裂纹缺陷.调节摆动激光摆幅可以在一定范围内对焊缝宽度进行调控.
"8"-shaped oscillating-laser scanning was adopted in GMAW(gas metal arc welding)process to modify the weld pool flow pattern and its temperature field,and thus improve the weld bead formation.Bead-on-plate welding experiments were conducted on 6061 aluminum alloy plates.The effects of major laser scanning parameters,such as the laser-wire distance,laser power and the oscillation amplitude,were experimentally analyzed.A high-speed camera was used to capture the process of laser scanning and the weld pool.Experimental results indicated that oscillating laser scanning could effectively suppress weld bead formation defects;optimal weld formation was obtained when applying oscillating-laser scanning across the middle part of the molten pool.Oscillatinglaser scanning reduced the temperature gradients of the weld pool.The laser recoil force could drive the molten pool flow actively,and thus promote the liquid metal spreading and effectively suppress irregularities in bead formation while reducing internal porosity and crack defects.Furthermore,the bead width could be adjusted within a certain range by adjusting the laser scanning amplitude.
作者
肖珺
葛欣雨
盖胜男
陈树君
盛卫星
陈少君
XIAO Jun;GE Xinyu;GAI Shengnan;CHEN Shujun;SHENG Weixing;CHEN Shaojun(College of Mechanical and Energy Engineering,Beijing University of Technology,Beijing,100124,China;Beijing Spacecrafts,China Aerospace Technology,Beijing,100190,China)
出处
《焊接学报》
EI
CAS
CSCD
北大核心
2024年第4期7-12,I0003,共7页
Transactions of The China Welding Institution
基金
国家重点研发计划资助项目(2022YFB3404700)
国家自然科学基金资助项目(52275304).
关键词
摆动激光扫描
熔化极气体保护焊
熔池流动
焊缝成形
oscillating-laser scanning
gas metal arc welding
molten pool flow
bead formation
