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How are the metals to be welded connected to each other in spot welding?

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in Casting-Forming-Welding II by (119k points)
How are the metals to be welded connected to each other in spot welding?

(a) Electric contact

(b) Magnetic field

(c) Mechanical pressure

(d) Direct contact

The question was asked in my homework.

I would like to ask this question from Resistance Welding Methods in division Welding and Related Processes of Casting-Forming-Welding II

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Best answer
The correct choice is (c) Mechanical pressure

Best explanation: In spot welding process, the metal or the alloy parts which are to be welded, are heated in their in their zones. To bring these parts in contact with one another, mechanical pressure is applied, causing them to connect.

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