电弧光谱信息在焊接质量检测上的应用研究

通过采集TIG，MIG焊接过程的光谱辐射信息，基于等离子体辐射的基础理论，对其焊接电弧辐射进行了分析，TIG焊与MIG焊的光谱分布由于气氛中金属元素浓度的差别，辐射强度和分布都存在较大差别：MIG焊不仅金属线谱数量多，辐射强度比TIG焊大，且随熔滴过渡波动明显。针对其光谱分布和变化特点，选择了特征谱段，用于焊接质量的检测;对于TIG焊选取线谱聚集的紫外区辐射(230～300 nm)，对于MIG焊选取以连续辐射为主的可见光区辐射(570～590 nm)，建立了不同焊接方法下，焊接电弧光谱信息在焊接质量检测上的应用理论基础。还进一步通过在焊接过程中预设干扰因素，采集焊接过程在特征谱段的信号，对选择谱段的试验验证表明：基于建立的理论基础，可以有效地利用焊接电弧光谱信息，对焊接质量及焊接过程干扰因素实现判识，特征谱段的信号具有很好的信噪比。

Study on the Arc Spectral Information for Welding Quality Diagnosis

Through collecting the spectral signals of TIG and MIG welding arc with spectrometer,the arc light radiations were analyzed based on the basic theory of plasma physics.The radiation of welding arc distributes over a broad range of frequency,from infrared to ultraviolet.The arc spectrum is composed of line spectra and continuous spectra.Due to the variation of metal density in the welding arc,there is great difference between the welding arc spectra of TIG and MIG in both their intensity and distribution.The...