Re: [MW:31420] PWHT Thickness Requirements.

As per table 331.1.3 for Pno. 1 material PWHT is not required when multilayered welding is used when the material thickness is larger than 5 mm and 95 deg C is applied when thickness is > 25 mm.

However, you should check if any specific service requirements apply

Στις Δευ, 7 Σεπ 2020 στις 2:26 μ.μ., ο/η 'Sankaran Sp' via Materials & Welding <materials-welding@googlegroups.com> έγραψε:

Dear Mr.Andrew,

irrespective of code, for P1 type material with 25mm and above thickness, after pre- heating & welding. PWHT is recommended one and it will reduce the HAZ hardness & eliminating the failure during service.  

Regards,

Sankaran.SP

Welding & Metallurgy expert

On Monday, 31 August, 2020, 07:57:49 pm IST, Andrew Ubakwem <andyubakwem@gmail.com> wrote:

Dear all

Pls what is the current thickness requirements for PWHT as per ASME B31.3? 

I came across old version of the code, it specifies that PWHT not required for all P1 materials, provided min preheat is maintained at 95deg'C.

We intend welding; 18" sch 80(23.83mm) to ASTM A 106, 24" sch 80(30.8mm), is PWHT required? Cite relevant Code sections Please.

Regards,

Andrew. 

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Welding, Stress Analysis, Corrosion, QA/QC, Failure Analysis, Risk Analysis

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