Question

Improper venting during moulding process causes a diesel effect which further results in stress crack defects in the casting.

(a) True

(b) False

This question was addressed to me at a job interview.

My question is from Venting of Moulds in section Mold and Mold Making of Casting-Forming-Welding I

Answer 1

Correct option is (a) True

To explain I would say: Improper or poor venting during moulding process causes a diesel effect that mainly occurs due to the combination of melt pressure and high temperature which ignite the oxygen and causes burnings in the mould which is also called as carbonization process that further results in marks and crack defects in the finished casting components.