In variable plasma arc welding of aluminum, the behavior of variable polarity plasma arc is effected by pilot arc.

在铝合金变极性穿孔焊接的工艺中，维弧对变极性电弧的行为有着重要影响。

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Apply high voltage pilot arc and high frequency stable arc with constant current properties, prevent influence from unstable voltage of power grid.

采用高压维弧和弱高频稳弧，同时具有恒流特性，不受电网电压波动的影响。

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This scheme not only eliminates the interference between main arc and pilot arc, but also reduces the deterioration of the tungsten electrode and improves the stability of welding process.

该方案不仅克服了传统方案存在的主维弧干涉现象，而且可大大降低钨电极的烧损，提高焊接过程的稳定性。

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Medals awarded to a World War II pilot who risked his life to drop the French Tricolour over the Arc de Triomphe in occupied Paris in 1942 are being auctioned.

BBC: Daring World War II pilot Ken Gatward's medals auctioned