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Up to what percent of carbon content in steel, it is not required to preheat it?(a) 0.25% – 0.3%(b) 0.3% – 0.35%(c) 0.35% – 0.4%(d) 0.4% – 0.45%This question was addressed to me during an internship interview.My question is based upon Welding of Various Metals in section Welding and Related Processes of Casting-Forming-Welding II

Answer»

Correct OPTION is (a) 0.25% – 0.3%

EXPLANATION: Low carbon steels are the ones containing low amount of carbon in them, which does not REQUIRE preheating. The amount of carbon content NEEDED in low carbon steels, is 0.25% to 0.3%, if preheating is to be avoided.


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