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Post-weld heat treatment (PWHT) is required by fabrication codes for certain structures to reduce welding residual stresses and temper hard, potentially brittle microstructure regions, but is an expensive process. Table 1 below displays the minimum thickness requirements above which PWHT must be utilized for various pressure vessel and piping standards, and this article reviews them …

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PWHT Solutions – Ensuring Strength and Integrity in Welded Structures Post weld heat treatment (PWHT) reduces residual stresses that could otherwise lead to distortion and cracking in welded structures, as well as prevent the development of brittle fracture, stress corrosion cracking and fatigue in these materials. pwht involves heating the weld metal to a specific …

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