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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^2The 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»

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.


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