Welding Of P11 Material, P11 To Carbon Steel Complete Guide
The PWHT process can be performed in a variety of ways, including through local PWHT or full PWHT in furnace, or even using induction heating. Post heating or PWHT of P11 welding is carried out at 650 °C to 705 °C (1,200 °F to 1,300 °F). The holding time is kept at 1 h/25 mm (1 hr/in.) and 15 minimum (Ref: API 582).