Question

Continuous passing of Co2 through the mould can decrease the strength of mould and results in a weak mould.

(a) True

(b) False

This question was addressed to me by my college director while I was bunking the class.

I want to ask this question from CO2 Process in chapter Special Casting Techniques of Casting-Forming-Welding I

Answer 1

The correct answer is (b) False

Easiest explanation: Continuous passing of Co2 always results in a strong and hard mould. More the passing of Co2 more will be the strength of the mould. Only the drawback is the decrease in permeability and collapsibility of the mould. Much passing of Co2 gas results into difficult breathing of the mould.