Question

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

(a) 43 kgf/mm^2

(b) 39 kgf/mm^2

(c) 45kgf/mm^2

(d) 48 kgf/mm^2

The question was asked by my college professor while I was bunking the class.

My question is from Metallurgy of Weld topic in section Welding and Related Processes of Casting-Forming-Welding II

Answer 1

Right answer is (a) 43 kgf/mm^2

The best explanation: When there is an addition of some microelements in the slag along with a few materials being present which are not metals, there is an increase in the strength of the mild steel arc weld. The minimum amount of strength goes up to 43 kgf/mm^2, which is 430 N/mm^2.