Gaseous helium is used as an inert shielding gas in metal arc and laser welding.

在金属电弧和激光焊接中气态氦用作惰性屏蔽气体。

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Gaseous helium is used as an inert shielding gas in metal arc and laser welding.

在金属电弧和激光焊接中气态氦用作惰性屏蔽气体。

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