Re: [MW:30225] A335P11 material - Delayed PWHT condition

Not only 48hrs and welding, NDE should be after SR because there is lot of chance for Reheat cracking

On Mon, 11 Nov 2019 8:46 am PARAI Reaction Channel, <saravanshyla@gmail.com> wrote:

Dears,

thanks for the reply.

We are going to use GTAW & FCAW for P No. 11 materials up to 28 mm Thk, so can we bake for 300 to 350 Deg C for an Hr and bring back the Tempr. to 15 Deg C.

Can we do PWHT after 1 day Or to start PWHT immediately after baking .

RT will be taken after 48 Hrs of welding completion time.

If you have any weld spec for P11 materials, then please share me.

Regards,

Saravanan,

Korea

On Sun, Nov 10, 2019 at 5:26 PM 'Rajnish Dixit' via Materials & Welding <materials-welding@googlegroups.com> wrote:

Dear Saravanan,
As per good engineering practices, 48 hours gap is suffecient time for P11material after PWHT as per your mail. More over, please consult your client if they have any specific recommendation.
Also, please go with the attached piece of information found on net, may be useful for you.

Thanks & Best Regards,
Rajnish

On Friday, 8 November, 2019, 10:19:04 AM GMT+7, PARAI Reaction Channel <saravanshyla@gmail.com> wrote:

Dear Experts,

For one of our project, 

With reference to the sketch shown below, we are going to weld 4 number of Single V Butt joints for A335P11 to itself ( P No. 4 ), pipe Thk of max 28.6 mm by using GTAW & FCAW process ,

Preheat Tempr. of Min. 120 Deg C ( Plan to use Burner ) and PWHT from 650 to 707 Deg C as per ASME B31.3 code.

After we complete the welding in our shop and bring back to the normal ambient tempr. around 15 Deg C, can we do PWHT after 1 or 2 days gap and then we do RT and PT ?

I worry that, during winter in Korea, the ambient tempr. may drop to Minus 10 Deg C.

As there is no weld spec from client for P No.4 , can we do PWHT after 2 days gap.

Please suggest me with any weld instructions for P. No.4 , Preheat maintenance, in order to avoid any crack after welding and with delayed PWHT condition.

With best regards,

Saravanan.Sornam,

Korea

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