不同窗口的电弧光谱信息与焊丝熔滴过渡

Spectral information from different arc spectral window and its droplet transfer

用光谱窗口替代光谱仪是实现熔滴过渡电弧光谱信息在线控制的基础。有两种不同的熔滴过渡光谱窗口选择方法 :选取以焊丝金属谱线为主的窗口或选取以保护气体元素光谱为主的窗口 ,不同的光谱窗口所反映的信息不同。通过实际选取这两个窗口 ,获得了相应的电弧光谱信息 ,并对这些信息特征进行了分析。结果表明 ,以焊丝金属谱线为主的光谱窗口光谱信息能很好地反映熔滴过渡过程是因为焊丝金属元素在电弧中的浓度分布直接反映着熔滴过渡 ,以保护气体元素光谱为主的窗口对电弧中的熔滴过渡反应程度较差是因为保护气体元素粒子浓度只能间接地反映熔滴过渡。要检测电弧熔滴过渡应选择焊丝金属元素谱线密集的光谱波段。

Using spectrum window replace spectrum meter is a precondition to control droplet transfer with spectral information online. Two kinds of spectral window can be selected, that are window dominated by metal spectrum of the electrode and window dominated by shielding gas. Different spectrum windows reflect different information. Two spectral windows were selected and corresponding spectral information were obtained. This paper have given the experiments and analytical results of different spectral window signal, which show the window dominated by metal spectrum of electrode can precisely reflect the droplet transfer in welding arc because of the concentration of the metal vapor affected directly by droplet transfer and the window dominated by shielding gas line spectrum cannot reflect droplet transfer perfectly because of the concentration of the shielding gas particle only affected indirectly by droplet transfer. It is wise to select the spectrum window where metal spectrum concentrates to detect the droplet transfer in welding arc.