M

Mr. Dubey • 52.30K Points
Coach 

Q. Which kind of resistance is experienced in upset butt welding?

(A) electric resistance
(B) magnetic resistance
(C) thermal resistance
(D) air resistance
Correct : Option (A)

Explanation: 
 in the making of an upset butt welding, there are jaws made of copper, into which the part to be welded is put, and hence a solid contact is made. at this point of contact, while the current flows, it gets transformed into heat because of electric resistance.

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