Question

which of the following is an advantage of friction welding?
a it can only weld plastic parts.
b it works best with flat, square parts.
c it produces clean joints without melting.
d it requires molten filler metal.

Explanation:

• Option A is incorrect: Friction welding can join metals and plastics, not only plastics.
• Option B is incorrect: Friction welding works well with cylindrical parts, not just flat square ones.
• Option C is correct: Friction welding uses frictional heat to create solid-state joints, no melting, resulting in clean, strong bonds.
• Option D is incorrect: Friction welding is a solid-state process, no molten filler metal needed.

Answer:

C. It produces clean joints without melting.