Topic: Manufacturing Engineering
Compressive residual stresses in weld joints
- A. Decreases tensile strength
- B. Increases cracking tendency
- C. Increases fatigue strength
- D. Coarsen the grain structure
Answer: C. Increases fatigue strength
Explanation: Compressive residual stresses in weld joints increase fatigue strength. The improvement in fatigue performance is based on the concept of lowering the effective applied tensile stresses by inducing compressive residual stress, which suppresses crack growth.