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文中采用无源探针对由等离子弧梯度电压和等离子鞘层电压构成的等离子反翘(等离子云)电压进行检测。
A non power supply probe was developed to detect the plasma cloud voltage, which consists of plasma arc voltage gradient and plasma sheath voltage.
并对等离子弧反翘产生的力学机理、等离子弧反翘的变化规律作了分析，从而得出等离子弧反翘可以作为等离子弧焊接熔透信息的特征量的结论。
In addition, we draw a conclusion that plasma cloud is the feature of the keyhole by the analysis to the mechanics of forming plasma cloud and the change rule of plasma cloud.
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