1.

Which kind of resistance is experienced in upset butt welding?(a) Electric resistance(b) Magnetic resistance(c) Thermal resistance(d) Air resistance

Answer» Correct choice is (a) Electric resistance

Best 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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