Question

Moisture from the mould can be removed by using of dryer or heater in Co2 moulding.

(a) True

(b) False

I have been asked this question during an internship interview.

Question is from CO2 Process topic in section Special Casting Techniques of Casting-Forming-Welding I

Answer 1

Correct answer is (b) False

To explain: In Co2 moulding, water is never added while preparing a sand mixture. Instead of water, sodium silicate is added to act as a binder. Hence the moisture is completely eliminated from the mould. So, this process provides great dimensional tolerances and high accuracy in the production of castings.