在金属电弧和激光焊接中气态氦用作惰性屏蔽气体。
Gaseous helium is used as an inert shielding gas in metal arc and laser welding.
同时，文中还对电弧的等离子体特性对激光吸收和屏蔽的机理进行了论述。
Furthermore, the absorption and shielding mechanism of laser by arc plasma was discussed.
利用水射流的屏蔽作用，消除水对电弧和焊缝的不利影响，是提高水下湿法焊缝质量的一种有效方法。
The underwater welding using a water jet curtain to prevent the damaging effect of water on arc and weld is a practical way to im- prove the"wet"weld quality.
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