Question

Directional solidification always ends at the sprue part and starts from the end of the casting.

(a) True

(b) False

I have been asked this question by my school principal while I was bunking the class.

My doubt stems from Directional Solidification in section Pattern and Mould, Principles of Gating & Risering of Casting-Forming-Welding I

Answer 1

The correct answer is (a) True

Easiest explanation: Directional solidification is always started from the farthest end of the casting and finishes at the sprue part of the casting system. Another term is the progressive solidification, in which solidification starts from the walls of the casting that is also known as parallel solidification.