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Re: [MW:35807] PWHT Requirements for WPS

By Materials & Welding

The PWHT is an essential parameter. The existing WPS can be used if the PWHT temperature range is within ±25°C 

of the prior 631°C. Still, a holding time deviation, from 450 minutes to 180 minutes, generally requires requalification 

or validation. Holding time is much stricter and should be based on material thickness and code passivity.

C Sridhar.


On Mon, 8 Sept 2025 at 16:33, pankaj pachahara <pankajpachahara@gmail.com> wrote:
What about holding time can we make new WPS and reduce holding time to as per the requirement 3 hour from 7.5 hours

On Mon, 8 Sep 2025 at 3:46 PM, Vishwas Keskar <vvkeskar123@gmail.com> wrote:
You can use
Pl note you can not go down less than 595 Deg C 

On Mon, 8 Sep 2025 at 3:39 PM, pankaj pachahara <pankajpachahara@gmail.com> wrote:
Dear Expert,

I have a WPS for SMAW+SAW process Material SA 516 GR.60/70 with PWHT requirements of 631°C temperature and 450 minutes holding time. 

Now, I have a new project with PWHT requirements of 600±25°C temperature and 3 hours holding time.

Can I use the existing WPS for this new project? What is the acceptable deviation (±) for PWHT requirements?

Looking forward to your guidance.

Best regards,
Pankaj Choudhary 

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