三熔化极MIG焊的燃弧形式及共有导电通道的建立
The arcing mode in triple-electrode metal inert gas welding and establishment of mutual conducting channel
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摘要: 试验中搭建了单电源三熔化极MIG焊系统，利用电信号采集系统检测焊接电流和电弧电压，借助高速摄像系统同步拍摄电弧形态及熔滴过渡过程.通过改变不同的预设电压值，观察到了三种基本的燃弧形式，以此分析三电弧共有导电通道的建立.结果表明，三种基本的燃弧形式依次为单丝燃弧、双丝燃弧及三丝燃弧.共有导电通道的建立分三个阶段，首先三个电极与母材之间形成各自的导电通道，其次三个导电通道在电磁引力的作用下彼此倾斜，打破各自原有导电通道建立共同的导电通道，最后新的导电通道调整至稳定状态.共有导电通道的建立更有利于电弧稳定燃烧.Abstract: Triple-electrode MIG welding system was established in this paper. The welding current and arc voltage were acquired through a signal acquisition system, and the arc behavior and metal transfer process were monitored with high-speed photography system synchronously. Three basic arcing modes were observed by changing preset voltage, which could be used to analyze the establishment of mutual conducting channel. The experimental results show that the basic arcing forms were single-wire arcing, twin-wire arcing, and triple-wire arcing. The establishment of mutual conducting channel can be divided into three phases. First, the conducting channel was established between three electrodes and base metal, respectively. Second, in order to establish the mutual conducting channel, three conducting channels broke the respective channel under electromagnetic attractive force. Last, a new conducting channel adjusted to steady state. Moreover, the mutual conducting channel could help to stable arc burning.
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Keywords:
- triple-electrode MIG welding /
- arcing mode /
- preset voltage /
- conducting channel
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