[MW:2199] Re: 2198] Full Penetration Weld Test On Assemble Valve

Customer require Full Penetration Weld on Valve. However, manufacturer response as below..

 

To carry out the FPW on the valve with ASTM A351CF8C is not advisable. This is because during the process the material will expose to the temperature around 900 deg C.

When the material (ASTM A351CF8C)  expose to the temperature above  700 deg C it will transform or out of shape especially on the  parts like valve disc or valve stem,seat, etc.

This valve also required PWHT and the PWHT is carry out prior to assembling and because of welding bonnet , disassembling , machining and polishing cannot be done.

Therefore we wish to inform you again that it is NOT ADVISABLE to do the FPW.

 

But customer still insist on the test. Please advise.

 

Rgds,

alee

 

On Mon, May 18, 2009 at 2:04 PM, Yeleswarapu, Ravi <Ravi.K.Yeleswarapu@c-a-m.com> wrote:

Mr. Lee – Could you post your question more in detail, as I understand the question – RT can be carried out on weld joint of assembled valve to test the weld full penetration.

 

From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of a lee
Sent: Monday, May 18, 2009 9:57 AM
To: materials-welding@googlegroups.com
Subject: [MW:2198] Full Penetration Weld Test On Assemble Valve

 

Can Full Penetration Weld test on assembled valve ( ASTM A351CF8C ) ?

 

Please advise.

 

Rgds,

alee

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