Question

What is the temperature at the positive terminal in carbon arc welding?

(a) 3800°C

(b) 3900°C

(c) 4000°C

(d) 4100°C

I have been asked this question during an internship interview.

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

Answer 1

Correct choice is (b) 3900°C

The explanation is: Carbon is used in carbon arc welding, at the negative terminal of the cathode and the metal which is being worked upon functions as the positive terminal. The temperature of the electrode at the positive terminal is 3900°C.