Post Weld Heat Treatment (PWHT)

Post Weld Heat Treatment (PWHT)

Post weld heat treatment (PWHT) to improve weld microstructure and reduce residual stresses developed during welding.

Specializes in performing PWHT for the steel and metal fabrication industries including the construction of pressure vessels, pressure piping, storage tanks, buildings, bridges, offshore platforms, power plants, oil and gas refineries, and petrochemical plants.

PWHT reduces or redistributes the residual stress introduced by the welding process with a technique that involves heating, soaking and cooling the weldment /machined surface to controlled temperatures. This improves the properties of the weldment/machined surface.

PWHT Include

  • Improved ductility of the material
  • Improved or reduced hardness
  • Reduced risk of brittle fracture
  • Relaxed thermal stress
  • Tempered metal
  • Removal of diffusible hydrogen (to prevent hydrogen induced cracking)
  • Improved metallurgical structure