Question

The allowable thermal gradient generally depends on the shape and size of a cross-section of the casting.

(a) True

(b) False

This question was addressed to me during an online exam.

I need to ask this question from Riser Placement in section Cooling and Solidification of Casting-Forming-Welding I

Answer 1

The correct choice is (a) True

Easy explanation: The thermal gradient within the casting is the most important factor during the last stage of cooling of casting. The minimum allowable thermal gradient generally depends on the shape and size of a cross-section of the casting. So to set up the risers in the casting system, area to volume (A/V) ratio of the casting is considered.