Post Weld Heat Treatment (PWHT), commonly referred to as stress relieving, involves the application of controlled heat after welding is complete. During welding, the high temperatures and rapid cooldown create stresses in the molecular structure of the welded parts. PWHT helps mitigate these stresses by allowing the metallurgical structures and molecules of the weld and parent metal to blend together during the heat-up, soak period, and cool-down, resulting in a finished product that meets the intended design criteria. This process reduces or redistributes the residual stress introduced by welding through a technique that involves heating, soaking, and cooling the weldment or machined surface to controlled temperatures, thereby improving its properties. Other benefits of PWHT include improved ductility, reduced or improved hardness, reduced risk of brittle fracture, relaxed thermal stress, tempered metal, removal of diffusible hydrogen to prevent hydrogen-induced cracking, and improved metallurgical structure.