【作者】 唐霞辉； 朱海红； 朱国富； 李适民； 李再光；

【Author】 Tang Xiahui Zhu Haihong Zhu Guofu Li Shimin Li Zaiguang (National Engineering Research Center for Laser Processing, Huazhong University of Science and Technology, Wuhan 430074)

【机构】 华中理工大学激光加工国家工程研究中心；

【摘要】 针对YAG脉冲激光焊接Al及45~#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300K。更多还原

【Abstract】 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.更多还原