Answer :
Final answer:
Projection welding which is a modification of spot welding is a type of resistance welding process. Other options such as Diffusion welding, Ultrasonic Welding and Friction stir welding are not resistance welding processes.
Explanation:
The answer to the question, 'Which of the following is a resistance welding process?' is b. Projection welding. This type of welding is a modification of spot welding. In this method, the weld is localized by means of raised sections, or projections, on one or both of the workpieces to be joined. Electric current and pressure are applied on the projection, and the heat generated causes the projection to collapse and form the weld.
Other options presented such as Diffusion welding, Ultrasonic Welding and Friction stir welding are not considered resistance welding processes. These processes involve different mechanisms and are used for specialized applications based on the type of materials being joined and the required strength of the weld.
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