YAG脉冲激光焊接的光致等离子体机理研究  

Study on Mechanism of Laser-induced Plasma during YAG-pulse Laser Welding

作　　者：唐霞辉[1] 朱海红[1] 朱国富 李适民[1] 李再光 

机构地区：[1]华中理工大学激光加工国家工程研究中心,武汉430074

出　　处：《中国激光》2000年第5期466-470,共5页Chinese Journal of Lasers

摘　　要：针对 YAG脉冲激光焊接 Al及 4 5#钢时产生的光致等离子体 ,采用空心圆电极探测等离子体电信号 ;建立探测器内等离子体区域分析的理论模型 ,并用试验加以验证。研究结果表明 ,在负电压段 ,等离子体电信号的电流随电压增加呈现饱和趋势 ;理论与试验曲线比较证明 ,等离子体温度高于被焊材料气化温度约 30 0 K。A hollow cylindrical electrode was employed to detect the electrical signal of laser induced plasma during YAG pulse laser welding of Al and 45 # steel. The theoeritical model has been established for analysis of the plasma region and compared with the experiments.The research results show that the current exhibit a saturation effect in the I V curves of plasma signal with increasing voltage in the negative voltage region, and the plasma temperature is higher than the vaporzation temperature of welded materials.

关 键 词：YAG脉冲激光焊接 光致等离子体 空心圆电极探测 

分 类 号：TG456.7[金属学及工艺—焊接]