Answer :
Final answer:
Spot welding, a form of resistance welding, typically utilizes an external cooling system. This process involves joining two metal surfaces by applying pressure and passing an electric current. The external cooling, often with water or air, is crucial to prevent overheating and maintain the effectiveness of the weld. The correct answer is a. Spot welding.
Explanation:
Among the listed resistance welding processes, spot welding is distinguished by its reliance on an external cooling system.
This technique involves the joining of two metal surfaces through the application of pressure and the passage of electric current at the joint.
The heat generated in spot welding is substantial, necessitating the use of an external cooling system, typically employing water or air cooling.
This additional cooling mechanism is essential for preventing overheating and ensuring the weld's structural integrity.
Employed extensively, especially in the automotive and electronics industries, spot welding's efficiency lies in its ability to rapidly and reliably create robust welds, with the external cooling system playing a critical role in maintaining optimal welding conditions.
Therefore, the correct answer is a. Spot welding.
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