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Which of the following gases is used in the method of recirculation degassing?

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in Casting-Forming-Welding II by (119k points)
Which of the following gases is used in the method of recirculation degassing?

(a) Hydrogen

(b) Nitrogen

(c) Argon

(d) Oxygen

The question was posed to me in class test.

I would like to ask this question from Methods and Materials for Degassing topic in division Foundry Introduction & Materials of Casting-Forming-Welding II

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Correct choice is (c) Argon

Best explanation: In the method of recirculation degassing, argon gas is used which is bubbled through the porous holes located at the bottom side of ladle. The speed of degassing will increases with the increase in rate of circulating the liquid metal through the vacuum region. And the circulating speed is increased by the increase in flow rate of argon gas.

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