Question:-
Two pipes of inner diameter 100mm and outer diameter 110mm each joined by flash butt welding using 30V power supply. At the interface, 1mm of material melts from each pipe which has a resistance of 42.4 ohm. If the unit melt energy is 64.4MJm-3, then time required for welding in seconds is

Option (A)
1
Option (B)
5
Option(C)
10
Option(D)
20
Correct Option:
(C)
question-answer-faq-2377