PWHT stands for Post Weld Heat Treatment. It is a process applied to welded components to relieve residual stresses, reduce hardness, and improve ductility and toughness. PWHT is particularly important in materials that are susceptible to cracking and stress corrosion, such as carbon and low-alloy steels, stainless steels, and certain other metals.
### Key Aspects of PWHT:
1. **Purpose**:
- **Relief of Residual Stresses**: Welding introduces