![]() Heating and cooling rate, holding temperature, and soak duration must be controlled and monitored precisely to avoid any detrimental effects such as reheat cracking, distortion, decrease in the toughness, and over softening to obtain the full benefit of the process. Uneven or quick heating or cooling can form cracks in the component. The holding temperature is the one that is high enough to relieve stress and reduce hardness, but it is lower than the initial transformation temperature. The heating rate is determined and controlled by the type of material thickness. The temperature ranges from 595˚C to 775˚C depending upon the properties of the metal/material. PWHT avoids Weld failures, susceptible brittle fracture and high. Hence, after welding, one has to process the material through Post Weld Heat Treatment. By PWHT, one can control the hardness of the material and reduce the residual stress induced. Post Weld Heat Treatment (PWHT) reheats the welded material using a controlled ramp-soak profile with a temperature below its initial transformation temperature. JRFURNACE offers Post Weld Heat Treatment to retain material strength of the part after welding. Current design codes such as ASME and BSI Pressure vessels and Piping codes specify that PWHT is required to ensure safe and desired design with optimum mechanical and metallurgic properties. This treatment can be performed after any welding process, but it has a specific meaning for few industries. PWHT not only reduces residual stress but also controls the material's hardness and enhances mechanical strength. Post Weld Heat Treatment (PWHT)/Stress Relief helps retain the material strength of the part subjected to welding by reducing and redistributing the residual stress. ![]()
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