Re: [MW:35618] PWHT

According to B31.3

Table 331.1.1 PWHT

Table 331.1.3 Exemptions for mandatory PWHT

For nominal material thickness > 25mm not required PWHT if applied a preheat of 95 degree prior to welding.

For nominal material thickness > 5mm up to 25mm not PWHT required if applied multiple layer welds. (Single layer or single pass follow note 6 of table 331.1.3).

However, this depends by your WPS, if it is required by WPS you must be follow

 

Vào Th 6, 16 thg 5, 2025 lúc 09:35 Elavarasan Mech <elavarasan1861994@gmail.com> đã viết:

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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