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). For HIC to occur, the follow-ing variables must be present (seeFigure 1): a sensitive microstructure,a sufficient level of hydrogen, or a highlevel of stress ( , as a result ofhighly constrained connections). Inferritic steels, hydrogen embrittlementonly occurs at temperatures close tothe ambient temperature.
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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