Which of the following metals is used for the preparation of patterns in shell moulding?(a) Aluminium(b) Copper(c) Grey cast iron(d) BrassThe question was posed to me during an online exam.This interesting question is from Shell Moulding topic in portion Special Casting Techniques of Casting-Forming-Welding I

Which of the following metals is used for the preparation of patterns

1.	Which of the following metals is used for the preparation of patterns in shell moulding?(a) Aluminium(b) Copper(c) Grey cast iron(d) BrassThe question was posed to me during an online exam.This interesting question is from Shell Moulding topic in portion Special Casting Techniques of Casting-Forming-Welding I
Answer» Correct option is (c) Grey cast IRON The explanation: GENERALLY, metal patterns with the associated gating are used. The metal used for preparing patterns is grey cast iron; it is mainly used because of its easy availability and good stability at the temperatures involved in the process. Sometimes, ADDITIONAL risers are ALSO required as the cooling in SHELL moulds is slow.

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