中国激光, 2018, 45 (4): 0402001, 网络出版: 2018-04-13   

激光深熔焊等离子体波动特征光电信号分析 下载: 833次

Optic-Electrical Signal Analysis of Plasma Fluctuation Characteristics in Laser Deep Penetration Welding
作者单位
1 天津大学材料科学与工程学院, 天津 300350
2 天津大学天津市现代连接技术重点实验室, 天津 300350
摘要
利用无源电探针检测装置, 对A304不锈钢YAG激光焊接过程中的等离子体电信号进行了检测, 并且同步触发高速摄像装置, 对等离子体的形态进行记录。对等离子体高速摄像图片与电信号进行了时域对比分析, 发现电信号电压波动特征与等离子体形态波动特征吻合较好。对一定时间长度内的电信号进行功率谱密度(PSD)分析, 发现电信号PSD图中特征峰值对应的频率与等离子体形态波动频率基本一致。结果表明, 等离子体的形态波动、电信号的波动特征与小孔的行为具有很强的关联性。这种波动特征受到焊接参数的影响, 波动频率随着激光热输入的增大而减小。
Abstract
A passive electrical probe detection device is employed to detect the electrical signal of plasma in the process of YAG laser welding for A304 stainless steels, and a high-speed CCD camera device is synchronously triggered to record the plasma plume shape. The high-speed camera images of plasma and the electrical signal in time domain are compared and analyzed, and it is found that the fluctuation characteristic of electrical signal is basically consistent with that of the plasma plume shape. The electrical signal with a certain time length is analyzed via its power spectral density (PSD), and it is found that the frequency of the characteristic peak in the PSD plot has a good agreement with the fluctuation frequency of plasma plume shape. The results indicate that there exist strong correlations among the plasma plume shape fluctuation, the fluctuation characteristic of electrical signal and the behavior of keyhole. This kind of fluctuation characteristic is affected by welding parameters, and the fluctuation frequency decreases with the increase of laser heat input.

邱文聪, 杨立军, 刘桐, 赵德金. 激光深熔焊等离子体波动特征光电信号分析[J]. 中国激光, 2018, 45(4): 0402001. Qiu Wencong, Yang Lijun, Liu Tong, Zhao Dejin. Optic-Electrical Signal Analysis of Plasma Fluctuation Characteristics in Laser Deep Penetration Welding[J]. Chinese Journal of Lasers, 2018, 45(4): 0402001.

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