Question

Improper venting arrangement causes mechanical trapping of gases in metal castings.

(a) True

(b) False

I have been asked this question during a job interview.

This is a very interesting question from Gases in Metals topic in division Pouring – Gating Design, Melting Furnaces, Melting and Casting Quality of Casting-Forming-Welding I

Answer 1

The correct choice is (a) True

To explain I would say: The gases in metals lead to faulty castings. In metal castings, the gases may be trapped mechanically by having improper venting arrangements, in such situations trapping of gases can be prevented by making proper venting arrangements in the mould.