Asset Intelligence Report

A Primer on Post-Weld Heat Treatment

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Post-weld heat treatment (PWHT) is the process in which a material that has been welded is reheated to a temperature below its lower critical transformation temperature, and then it is held at that temperature for a specified amount of time. The need for PWHT is due to the residual stresses and micro-structural changes that occur to the material after welding has been completed. PWHT is therefore required to reduce the residual stress and restore ductility in the weldment assembly.

This Asset Intelligence Report serves as an informative primer to provide an understanding of PWHT. This primer contains the following sections:

  • Overview
  • Steel Classifications
  • History and Development of Heat Treating
  • The Anatomy of a Weldment
  • PWHT Code Requirements
  • PWHT Heating Equipment
  • Relevant Codes, Standards, and Best Practices for Welding and PWHT
  • References
  • Further Reading

As with other Asset Intelligence Reports, this document is not intended to serve as a comprehensive guide, but rather an introductory primer on PWHT. Since the information is provided in a condensed format, we recommend printing and laminating copies that can be referenced by you and your co-workers at your convenience.

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A Primer on Post-Weld Heat Treatment

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