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Re: [MW:31402] PWHT Thickness Requirements.

By Materials & Welding
There are reasonable changes in ASME B31.3 2018 edition which exempts PWHT if applied a Preheat of 95degC for P1 materials. Please check.

Thanks & Regards

J.Gerald Jayakumar



On Monday, 7 September, 2020, 06:26:18 pm GMT+7, 'Sankaran Sp' via Materials & Welding <materials-welding@googlegroups.com> wrote:


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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