Establishing Recommended Guidance for Local Post Weld Heat Treatment Configurations Based on Thermal-Mechanical Finite Element Analysis

by Brian R. Macejko / Phillip E. Prueter, P.E. / July 2016

 

In July, 2016 Phillip Prueter and Brian Macejko presented Establishing Recommended Guidance for Local Post Weld Heat Treatment Configurations Based on Thermal-Mechanical Finite Element Analysis. Below is an introduction to their presentation:

 

  • Post weld heat treatment (PWHT) is an effective way to minimize weld residual stresses in pressure vessels and piping equipment.
  • PWHT is required for carbon steels above a Code-defined thickness threshold and other low-alloy steels to mitigate the propensity for crack initiation and ultimately, brittle fracture, and is often employed to mitigate stress corrosion cracking due to environmental conditions.
  • Performing local PWHT following component repairs or alterations is often more practical and cost effective than heat treating an entire vessel or a large portion of the pressure boundary.
  • Spot or “bulls eye” configurations are often employed in industry to perform PWHT following local weld repairs to regions of the pressure boundary.
  • Both the ASME Boiler and Pressure Vessel (B&PV) Code and the National Board Inspection Code (NBIC) permit the use of local PWHT around nozzles or other pressure boundary repairs or alterations.
  • Additionally, Welding Research Council (WRC) Bulletin 452 offers detailed guidance relating to local PWHT and compares Code-based methodologies for implementing local PWHT on pressure retaining equipment.

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