其电弧稳定与否，主要取决于电流过零瞬间的电弧空间电离度、 电极发射电子能力及再引燃电压的上升速度。
The stability of the welding arc depends mainly on the voltage and the gas ionization when current zero-crossing as well as the electron emission ability of the electrode.
在以半腔为首腔的边耦合驻波加速管中观察到了电子反轰现象，由于电子反轰的结果，导致电于枪发射电流非正常增长。
The electron back bombardment phenomenon, which results in anomalous increase of gun current emission, has been observed in a series of our side coupled standing wave accelerating tubes.
该电子发射膜可以在其使发射电流流动时将场强限制为低水平，并且该电子发射膜具有均匀的电子发射特性。
The electron emission film can restrict the field intensity to a low level when it causes an emission current to flow, and has a uniform electron emission characteristic.
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