PWHT is often required to reduce residual stresses from welding and to temper the microstructure, thereby lowering the hardness of the HAZ. Welding Procedure Qualification:
: The official source for purchasing the most recent, validated version of the standard. Scribd Technical Overview nace rp0472 pdf new
: Originally RP0472 ("Recommended Practice"), it is now SP0472 ("Standard Practice") to align with modern NACE naming conventions. PWHT is often required to reduce residual stresses
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