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Carbon is intended to be mixed in small amounts in the weld, in carbon arc welding.(a) True(b) FalseThe question was posed to me in an online interview.This intriguing question comes from Arc Welding Methods topic in chapter Welding and Related Processes of Casting-Forming-Welding II

Answer»

Correct choice is (b) False

Easy explanation: In CARBON arc WELDING, the carbon is PRESENT at the negative electrode, where the electrode TEMPERATURE is at 3200°C. This temperature is lesser than that at the positive electrode. Carbon electrode is KEPT at a lower temperature on the negative electrode, to avoid the mixing of carbon in the weld. If the carbon gets mixed with the weld, the weld might end up becoming brittle.


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