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Which gas is not used for fluxing and flushing in aluminium alloys?

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in Casting-Forming-Welding II by (119k points)
Which gas is not used for fluxing and flushing in aluminium alloys?

(a) Argon

(b) Chlorine

(c) Nitrogen

(d) Oxygen

I got this question by my school principal while I was bunking the class.

I need to ask this question from Aluminium and Its Alloys topic in division Foundry Introduction & Materials of Casting-Forming-Welding II

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Correct option is (d) Oxygen

The best explanation: Fluxing and flushing is an operation which is done for the removal of hydrogen from the molten metal. In this process, argon gas, chlorine gas, nitrogen gas and helium gas are used as fluxes and not oxygen.

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