基于连续谱修正的标准温度法的钨极惰性气体保护焊电弧温度场分析

基于光谱学理论分析氩原子谱线波长为794.8 nm的特征谱发射系数、连续谱发射系数和总发射系数与温度之间的关系，以及连续谱对标准温度法的影响，并对标准温度法的曲线进行修正；利用具有高速摄影的电弧光谱采集系统拍摄氩原子波长为794.8 nm的特征谱的电弧图像；根据修正后的标准温度法计算直流钨极惰性气体保护焊的电弧温度场分布，对修正前、后的电弧温度场加以比较.结果表明，考虑连续谱时，电弧的温度有所升高.结合光谱仪拍摄的电弧谱线强度分布规律表明，连续谱对氩原子波长为794.8 nm的特征谱的温度计算结果影响较小.

Analysis on Temperature of TIG Welding Based on Continuum Spectrum for Modified Fowler-Milne Method

In order to improve the accuracy of measurement by arc image obtained by high speed camera, the modified Fowler-Milne method based on continuum spectrum was used. Based on the theory of spectrum, the relationships between emission coefficient and temperature were calculated. The emission coefficient includes spectrum line, continuum spectrum and total emission coefficient for 794.8 nm. The influence of continuum spectrum for Fowler Milne method was analyzed, and then the Fowler-Milne method was modified, arc image of spectra line in 794.8 nm was captured by high speed camera. The temperature distribution of direct current-tungsten intert gas arc welding was calculated according to the modified Fowler Milne method. Arc temperature field was compared before and after modification. The temperature field increases when continuum spectrum is taken into account. The result of spectrometer proves that the influence of continuum spectrum is small.