采用焊接电弧光谱检测装置，对脉冲MIG焊熔滴过渡的光谱信息进行了研究，结果表明，电弧光谱信息可以很好地反映脉冲MIG焊的熔滴过渡；发现了多种熔滴过渡的光谱信息模式，这些模式可反映1峰0基、1峰1基等各种形式的熔滴过渡，特别是可以对脉冲峰值期间的多滴喷射过渡作出清晰的反映；信号波形的脉动幅值大，脉宽较宽，抗干扰能力强，容易识别，信号品质优越。这些结果为脉冲MIG焊熔滴过渡的光谱实时控制奠定了良好基础，为脉冲MIG焊的控制开辟了一条新途径。

By the aid of the spectrum detecting device of welding arc, the droplet transfer spectral information of pulsed MIG welding has been researched experimentally. Results show that the arc spectral information can reflect well droplet transfer process in pulsed MIG welding. Many kinds of spectral information modes of droplet transfer have been found, which can reflect various droplet transfer types, such as one-peak-zero-base, one-peak-one-base, one-peak-two-base, two-peak-zero-base, two-peak-one-base, two-peak-two-base, three-peak-zero-base and so on. Especially, they can sharply and clearly reflect multiple drops spray transfer in the period of pulse peak. These spectral information have excellent character and therefore the spectral real-time and precise control of droplet transfer in pulsed MIG welding will be realized.