GATE ME 2016 Set 3 — Question 58
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Manufacturing Processes → Joining → Welding Processes
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Question
Spot welding of two steel sheets each 2 mm thick is 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.
| Property | Value |
|---|---|
| Latent heat of fusion for steel | 1400 kJ/kg |
| Effective resistance of the weld joint | 200 |
| Density of steel | 8000 kg/m |
Correct answer
2.85 to 2.95
Solution
1.Heat generated ():
J.2.Heat required to melt the nugget ():
where mm = 0.005 m, kg/m, kJ/kg = J/kg.
m = 2.91 mm.
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