Support Welding of Cladded Pipes

[Biplab Pal]

Dear Experts,

We have the Cladded Pipe of ASTM A335 Gr P11 (9.3 mm to 25 mm)  with internally cladded with SS347 (3mm).

We need to weld the Pipe Support with the pipes.

Our pipe support is P11 grade and the WPS is qualified with PWHT @740 for minimum 2 hours.

If we do PWHT is it going to effect the SS cladding? is there any corrosion issue.

We need your kind advice.

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Thanks & Regards
Biplab Pal
Welding Inspector

E-mail:   bipla...@gmail.com
 
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[M.Sathiya Narayanan]

the corrosion property will deteriorate to some extent based on the PWHT control, 

as SS 347 is stablized one deterioration  will be limited to some extent 

WPS shall be qualified on cladded plate with PWHT and corrosion test on cladded area after PWHT  to ensure corrosion property  

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Thanks and Regards
M.Sathyanarayanan

[dili...@gmail.com]

I assume the support will be attached by means of a fillet weld.

What is the throat size? You may do not need PWHT

Sent from my BlackBerry 10 smartphone.

From: 'Biplab Pal' via Materials & Welding Sent: Κυριακή, 12 Ιουνίου 2016 - 05:34 To: materials-welding Reply To: material...@googlegroups.com Subject: [MW:24936] Support Welding of Cladded Pipes

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[Andreas Suryanda]

I have several experience at clad material especially SS and Nickel Alloy material.

Basically, i believe PWHT at 740 is refer to the carbon steel and not intended to be done on clad material.

For clad material, you have to proof by mechanical test, chemical analysis.

However, since clad material is intended for corrosion resistance result, you may need to check for intergranullar corrosion on the clad material.

Personally I just PWHT for nickel clad material. And it seems affect the intergrannular corrosion resistance.

Regards,

Andreas Suryanda