Question

which of the following best describes how solid - state welding differs from fusion welding? a fusion welding uses no heat or pressure. b solid - state welding joins materials without melting them. c solid - state welding melts both metals and then cools them quickly. d fusion welding is only used for non - metal materials.

Explanation:

Fusion welding relies on melting the base materials (and often a filler) to join them, while solid-state welding joins materials in their solid phase, without reaching their melting point. Option A is wrong because fusion welding uses heat. Option C is incorrect as it describes fusion welding, not solid-state. Option D is wrong because fusion welding is commonly used for metals.

Answer:

B. Solid-state welding joins materials without melting them.