Re: [MW:30216] A335P11 material - Delayed PWHT condition

Dear

Where is written that after welding immediate do PWHT. 

you can do PWHT after one, two or more days. 

We r doing preheat during welding and after welding complete, we have continue preheat and come down temp upto ATM. 

Regards 

A p gupta 

Sent from Yahoo Mail on Android

On Fri, 8 Nov 2019 at 8:49, 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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