by Phillip E. Prueter, P.E. / Jan 01, 2018

Given the concern throughout industry regarding potential brittle fracture failures, updated post weld heat treatment (PWHT) guidance is examined in this article, and commentary on the potential reduction in notch toughness due to PWHT is provided based on published data. This article provides an overview of the recent changes in ASME B31.3 PWHT requirements and the effectiveness of weld preheat, wherein a rigorous approach to generate impact test exemption curves and to determine appropriate Charpy impact test temperatures by establishing separate as-welded and PWHT curves is provided.

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