Question

What is the level of efficiency of a transformer as a welding machine?

(a) 10-20%

(b) 30-60%

(c) 60-80%

(d) 80-85%

The question was posed to me in exam.

Asked question is from Welding topic in section Metallurgy of Welding, Brazing and Soldering of Engineering Material & Metallurgy

Answer 1

Correct choice is (d) 80-85%

The explanation: An AC machine (transformer) is preferred for welding as it has a higher efficiency of 80-85%. Moreover, it has a lower power consumption and low cost of equipment. The efficiency for a DC machine (generator) is a low 30-60%.