Problem NO: 12

A resistance spot-welding operation is performed on two pieces of 0.040 in thick sheet steel (low\ncarbon). The unit melting energy for steel = 150 Btu

A resistance spot-welding operation is performed on two pieces of 0.040 in thick sheet steel (low

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carbon). The unit melting energy for steel = 150 Btu/in3. Process parameters are: current = 9500 A

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and time duration = 0.17 sec. This results in a weld nugget of diameter = 0.19 in and thickness =

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0.060 in. Assume the resistance = 100 micro-ohms. Determine (a) the average power density in the

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interface area defined by the weld nugget, and (b) the proportion of energy generated that went into

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formation of the weld nugget.

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