Question

Faster and uneven cooling of hot casting affects the castings badly or may cause several defects in the castings.

(a) True

(b) False

The question was asked in quiz.

The above asked question is from Casting Cleaning topic in portion Pouring – Gating Design, Melting Furnaces, Melting and Casting Quality of Casting-Forming-Welding I

Answer 1

Correct answer is (a) True

To elaborate: When the hot casting is exposed to the air, there is likely to be faster and uneven cooling because of which the casting may wrap, crack or induce thermal stresses beneath the skin. The moulding sand provides a uniform cooling medium for the casting while producing least amount of internal stresses.