Question

What is the maximum strength of mild steel arc welds on addition of microelements in the slag?

(a) 53 kgf/mm^2

(b) 49 kgf/mm^2

(c) 57kgf/mm^2

(d) 61 kgf/mm^2

The question was posed to me in a job interview.

This interesting question is from Metallurgy of Weld topic in chapter Welding and Related Processes of Casting-Forming-Welding II

Answer 1

Correct option is (c) 57kgf/mm^2

For explanation I would say: When there is an addition of some microelements in the slag along with a few nonmetallic inclusions, there is an increase in the strength of the mild steel arc weld. The maximum amount of strength goes up to 57 kgf/mm^2, which is 570 N/mm^2.