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Molten metal is poured into the mould; meanwhile it removes the wax by melting it and vapourization of wax takes place simultaneously in the investment casting.

(a) True

(b) False

This question was addressed to me during an interview.

This intriguing question originated from Precision Investment Casting in division Special Casting Techniques of Casting-Forming-Welding I

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Right option is (b) False

Explanation: Firstly the pattern is removed completely from the mould then the process of pouring of molten metal occurs in the investment casting. For the removal of pattern from the mould, heating is done to melt the pattern. Then the melted wax is completely drained through the sprue by inverting the mould.

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