Transcription of Key Concepts in Welding Engineering - Foundation
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Key Concepts in Welding Engineering - Foundation
Welding Innovation Vol. XV, No. 2, 1998 What is PWHT?Postweld heat treatment (PWHT),defined as any heat treatment afterwelding, is often used to improve theproperties of a weldment. In concept ,PWHT can encompass many differentpotential treatments; however, in steelfabrication, the two most common pro-cedures used are post heatingandstress is it Required?The need for PWHT is driven by codeand application requirements, as wellas the service environment. In gener-al, when PWHT is required, the goal isto increase the resistance to brittlefracture and relaxing residual desired results from PWHT mayinclude hardness reduction, and mate-rial strength HeatingPost heating is used to minimize thepotential for hydrogen induced crack-ing (HIC).
Welding Innovation Vol. XV, No. 2, 1998 What is PWHT? Postweld heat treatment (PWHT), defined as any heat treatment after welding, is often used to improve the
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