PWHT (Post Weld Heat Treatment)

  • Objective

    To reduce residual stresses, unwanted grain structure and hardnesses in welded parts with heat.

  • Method

    Controls baking of metal parts, where the temperature of the part is slowly increased, soaked at a high temperature and slowly cooled down in a controlled manner.

  • Benefits

    Minimizes the risk of cracking, corrosion, improves ductility and improves overall structural integrity.

  • Application

    Necessary when steels are made with enough carbon, manganese, chromium, molybdenum, vanadium, nickel and copper to dangerously increase their hardenability. Low alloy and high alloy steels must be post weld heat treated to preserve life, equipment and the environment.

    Incorporating WPS development and PWHT/Stress Relief into these welding processes contributes to the overall quality and reliability of the welded components.