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Which kind of resistance is experienced in upset butt welding?

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in Casting-Forming-Welding II by (119k points)
Which kind of resistance is experienced in upset butt welding?

(a) Electric resistance

(b) Magnetic resistance

(c) Thermal resistance

(d) Air resistance

This question was addressed to me in an international level competition.

My question is taken from Resistance Welding Methods topic in division Welding and Related Processes of Casting-Forming-Welding II

1 Answer

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Best 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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