Topic: Manufacturing Processes
Which one of the following is a solid state joining process?
- A. Gas tungsten arc welding
- B. Resistance spot welding
- C. Friction welding
- D. Submerged arc welding
Answer: C. Friction welding
Explanation: Friction welding is classified as a solid-state joining process. In this specific type of joining, no molten or liquid state is involved. Instead, the metal joining occurs due to the application of intense high pressure in the solid state, which facilitates intermolecular diffusion directly at the interface surface.