Re: [MW:31154] CS with Duplex SS (S31803) clad vessel PWHT?

i am not getting why you are sooo afraid of cladding with cs .you have to do nothing especial for this simply put your job in  close furnance and attached weld but remember if u are attaching thermocouple inside of vessel also than dont weld it at ss plate ,attach it at weld.i i did firing in furnace not inside the remember if its not clad than i have a option of inside firing of vessel

On Sat, 18 Jul 2020, 8:01 am , <pgoswami@rogers.com> wrote:

A few questions on this interesting  topic  as well as  on the suggestions imparted as below.

 

• How  do you perform local PWHT on a fully fabricated pressure vessel? If that's the case , every weld joint (L-Seam, C-Seam, Nozzle Welds ) has to be individually wrapped by heating coils. Is that possible  after fabrication of entire vessel?
• Restoration of Duplex clad is usually done after barrier layer by 309L.  2209 electrode/filler  may be used  also right from the first layer for restoration of clad.  
• PWHT of 51 mm thick Duplex clad vessel would encompass the following PWHT cycle easily:-

1. Ambient to 300 Deg C-Unlimited heating, 300 Deg C /Hr. Hold at 300 Deg c for uniform equalization of  temperature
2. From 300 Deg C to 600 Deg C – ROH 40-50 Deg C /Hr- would involve- easily 4 hrs of heating cycle
3. Soak 2 600-620 Deg C- for 2 hrs easily

Hence depending on the size of the vessel, a heating cycle of 7-8 hrs easily would be required between 300- Deg C  to 600 Deg C. Same would be case for cooling . Hence a PWHT .stress relief temperature @ 600 Deg C  could be quite harmful. Typically 300-700 Deg C is the formation range of various intermetallic phases for Duplex S.S.

 

It would be nice to know the decision taken by the originator of this query , for education of all concerned.

 

Thanks.

P.Goswami.P.Eng, IWE.

Independent  & Consulting Welding & Metallurgical Specialist

Linkedin: https://www.linkedin.com/in/pradip-goswami-2999855/

Email:pgoswami@rogers.com,pradip.goswami@gmail.com

Cell/Whasapp:1-905-9793232

 

From: materials-welding@googlegroups.com <materials-welding@googlegroups.com> On Behalf Of Customer Care
Sent: July 11, 2020 10:13 PM
To: materials-welding@googlegroups.com
Subject: RE: [MW:31136] CS with Duplex SS (S31803) clad vessel PWHT?

 

Hi,

You can realize the dissimilar welding (CS 516 Gr.70) + Cladding (S31803) with PWHT following these steps:

-As the base metal of CS have 51 mm of thickness, apply preheating about 175 °C and maintain it during the welding.   Use filler for CS type E/7018 (depending welding process).

 

-Buttering the CS with austenitic filler metal (e.g., E/309L) and remove clad S31803 with grinding, 2" side and side of the weld joint. Realize localized PWHT over the weld metal and HAZ only, about 625 °C during one and half hours.

             - Weld the S31803 clad using duplex filler like E/2209.

 

Ramon Briceno

Senior Metallurgical Engineer / Oil & Gas

 

 

Sent from Mail for Windows 10

 

From: Materials & Welding
Sent: Saturday, July 11, 2020 6:42 AM
To: Materials & Welding
Subject: [MW:31131] CS with Duplex SS (S31803) clad vessel PWHT?

 

ASME Sec VIII div1

SA516 Gr 70 - 51mm thickness+S31803 clad

 

any experience on duplex clad vessel PWHT?

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