Question

why might an engineer choose solid - state welding instead of fusion welding?
a to use filler metal for a stronger weld
b to make a joint that melts completely
c to join materials that cannot be fused by heat
d to avoid applying pressure during welding

Explanation:

Solid-state welding does not melt the base materials, unlike fusion welding. Option A is incorrect because solid-state welding typically does not use filler metal. Option B is incorrect as fusion welding (not solid-state) melts the joint materials. Option D is incorrect because solid-state welding often uses pressure to form the joint. Option C is correct because solid-state welding can join materials that cannot withstand the high heat of fusion welding or cannot be fused by heat.

Answer:

C. to join materials that cannot be fused by heat