Spot welding of two steel sheets each 2 mm thick carried out successfully by passing 4 kA of current for 0.2 seconds through the electrodes. The resulting weld nugget formed between the sheets is 5 mm in diameter. Assuming cylindrical shape for the nugget, the thickness of the nugget is ______mm.
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Latent heat of fusion for steel
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1400 kJ/kg
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Effective resistance of the weld joint
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200 W
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Density of steel
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8000 kg/m3
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