Question

Maintaining of hydrogen level to a minimum in a melt is very important because there is no simple dehydrogenating technique.

(a) True

(b) False

This question was posed to me during a job interview.

My doubt is from Gases in Metals in portion Pouring – Gating Design, Melting Furnaces, Melting and Casting Quality of Casting-Forming-Welding I

Answer 1

The correct answer is (a) True

To explain: There is no simple dehydrogenating addition to eliminating hydrogen in the form of slag. So, care should be taken to maintain the hydrogen level to a minimum. The method used for removal of hydrogen in which partial pressure of hydrogen is reduced by bubbling some other dry insoluble gas through the melt; this method is not easy and also causes many other problems.