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Which of the following is not a purpose of fluxing and flushing the aluminium alloys?

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Which of the following is not a purpose of fluxing and flushing the aluminium alloys?

(a) Removal of dissolved hydrogen

(b) Removal of dissolved oxygen

(c) Separation of dross from melt

(d) Entrapment of dross

I had been asked this question in examination.

The question is from Aluminium and Its Alloys in portion Foundry Introduction & Materials of Casting-Forming-Welding II

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Right option is (b) Removal of dissolved oxygen

Best explanation: Fluxing and flushing are an important task in aluminium alloy foundries. It is done for removing the dissolved hydrogen from the melt, for separating the dross from molten metal and to entrap the dross.

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