RE: [MW:4805] Buttering procedure for P4 to Inconel

You may use Inconel to Inconel PQR for butt weld, however for buttering you require a separate buttering PQR for buttering thickness less than 5mm or a groove weld PQR on P4 material welded with Inconel can be used when your buttering thickness exceeds 5mm. Weld overlay PQR can't be used for buttering.

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From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Muhammed Ibrahim
Sent: Tuesday, April 13, 2010 2:36 PM
To: materials-welding@googlegroups.com
Subject: [MW:4804] Buttering procedure for P4 to Inconel

Hi Members,

 

Kindly request your suggestion on the following matter.

 

We have to weld one 2" Nozzle (PNo.4) to Tube sheet with (PNo.4). Due to some practical dificulties we have to avoid PWHT of this joint. So we are planning to buttering both nozzle and tube sheet nozzle opening with Inconel. Then Butt weld the joint with Inconel.

 

We have one overlay procedure (SMAW) with Inconel on P4 material with PWHT and another butt welding procedure for Inconel to Inconel (GTW+SMAW) without PWHT.

 

Can I use these PQR together for this butt weld?.

 

Or I have to qualify a new buttering+buttwelding PQR with same condition?.

Thanks & Regards
Muhammed Ibrahim PK