Purposes of Post Weld Heat Treatment PWHT

Purposes of PWHT: 1. Residual Stress Reduction: • Minimizes stresses introduced during welding, preventing distortion and improving structural integrity. 2. Microstructure Refinement: • Optimizes the microstructure of the weld, enhancing mechanical properties such as strength and toughness. 3. Hydrogen Diffusion: • Aids in the diffusion of hydrogen, reducing the risk of hydrogen-induced cracking in high-strength steels. 4. Improving Toughness: • Increases the toughness of welds, particularly important for applications where impact resistance is critical.