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Re: [MW:30217] A335P11 material - Delayed PWHT condition

By Materials & Welding

Hi,

For welds made by SMAW and FCAW, after completion of welding and without allowing the weldment to cool below the minimum preheat temperature, the temperature of the weldment shall be raised to a temperature of ATLEAST TO MAXIMUM INTERPASS TEMPERATURE MAINTAINEDAS A MINIMUM  OR 300-350 DEGREE CELSIUS for a minimum period of two hours. This hydrogen bake-out treatment may be omitted provided the electrode used is classified by the filler metal manufacturer with a diffusible-hydrogen designator of H4 (e.g., E7018-H4);


Thanks& Regards,

 

(Karthik)

Karthikeyan.S

M: +66-892512282

E-mail : karthik6684@yahoo.com



On Friday, November 8, 2019, 10:19:00 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.

image.png

With best regards,
Saravanan.Sornam,
Korea

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