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Pre-heating of the mould is done to generate adhering characteristics of the moulding surface.

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Pre-heating of the mould is done to generate adhering characteristics of the moulding surface.

(a) True

(b) False

The question was asked in unit test.

This key question is from Precision Investment Casting in chapter Special Casting Techniques of Casting-Forming-Welding I

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Right answer is (b) False

The explanation: The moulds are pre-heated to a temperature of 100 to 1000 ⁰C, depending on the complexity, size and the metal of the casting. This is mainly done to reduce any last traces of wax left off and permit proper filling of all mould sections, which are too thin to be filled in a cold mould.

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