焊接电弧发射光谱的动态诊断方法及其应用

Welding arc emissive spectrum dynamic diagnosis and it's application

关键词:  交流动态电弧  光谱  动态诊断  时控统计平均方法

Key words:  AC dynamic arc  emissive spectrum  dynamic diagnosis  time-control and statistic-average method

摘要:

建立了新型的电弧光谱动态诊断系统,提出了基于时控统计平均方案的动态诊断方法,实现了对电弧光谱连续的动态诊断.结果表明,应用这一新型诊断系统,可以观测交流电弧特征谱线半高宽变化量和中心波长位移量两个重要特征量的动态变化规律,进而可认识交流电弧电子数密度和氩原子激发温度的动态变化,这对于研究电弧(特别是交流电弧)热力学状态的时间特征具有重要的意义;另外,这一诊断方法拓展了以往电弧发射光谱诊断方法的应用范围,在焊接电弧物理研究中将有着良好的应用前景。

Abstract:

Emissive spectrum diagnosis is important to study welding arc phenomenon. Limited by experimental condition in the past, the knowledge of spectrum dynamic diagnosis is not enough and most of the diagnosis results come from stable TIG arc. In this paper, based on modern ICCD spectrum instrument, a new type of arc spectrum dynamic diagnosis system is established and a new diagnosis method based on time-control and statistic-average is developed to observe AC dynamic welding arc continuously. The half-height width and wavelength shifting of AC TIG arc spectrum line can be observed, furthermore electron density and Ar atom excitation temperature can be obtained. This dynamic observation is quite significant to study the time-characteristic of arc (especially alternative current arc).