Question

Cooling of casting walls of non uniform thickness results into formation of tears or warping in the metal casting.

(a) True

(b) False

This question was posed to me in an internship interview.

This key question is from Product Design for Sand Castings in chapter Pouring – Gating Design, Melting Furnaces, Melting and Casting Quality of Casting-Forming-Welding I

Answer 1

The correct option is (a) True

The best I can explain: If the casting walls have non-uniform thicknesses, then the thinner walls would have cooled down very quickly leaving the thicker wall still in the plastic state. When the thinner walls contract due to solid shrinkage, because of the plasticity, the thicker rib would warp.