Question

A resistance spot-welding operation is performed on two pieces of 1.5-mm-thick sheet steel using 12,000 A for a 0.20 s duration. The electrodes are 6 mm in diameter at the contacting surfaces. Resistance is assumed to be 0.0001 V, and the resulting weld nugget is 6 mm in diameter and 2.5 mm thick. The unit melting energy for the metal Um= 12.0 J/mm3.
What portion of the heat generated was used to form the weld nugget, and what portion was dissipated into the work metal, electrodes, and surrounding air?​

Answer 1

Answer:

Principle y Both heat and pressure are used. y Heat is generated by the electrical resistance of the work pieces and the interface between them. y Pressure is supplied externally and is varied throughout the weld cycle.

Explanation:

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