Re: [MW:35619] PWHT

Dear Elavarsan 

As per B31.3

A preheat of 95°C (200°F) is applied prior to welding on any nominal material thickness >25 mm (>1.0 in.)

Multiple layer welds are used when the nominal material thickness >5 mm (>3 ∕ 16 in.) [Single-layer or single-pass welds may be exempted from PWHT, provided the WPS has been qualified using single - pass welds with ±10%heat input and that all other conditions for exemption are met.]

Depends on Your WPS

On Fri, May 16, 2025 at 10:35 AM Elavarasan Mech <elavarasan1861994@gmail.com> wrote:

Dear all

please clarify below 

As per B31.3 above 16 mm ( P1 MATERIAL)thickness required PWHT?

what's is minimum thickness required for PWHT as per B31.3 ( P1 MATERIAL)

Regard 

ELAVARASAN 

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