Hi Maulik,
Please Sec-III, NB-4450 for repair of weld defects. If this defect is on equipment where:-
1. Its’ under fabrication, no PWHT had been performed --defects would be repaired with due care as that of new joint. If there’s a qualified WPS & PQR on 15Mo3 # 20MnMoNi55 material may be followed.
2. If repair is after PWHT- the repair shall be as under 1, the equipment have to be re-stress relived. PQR should be qualified with the additional time in order to accommodate the extra PWHT cycle. See under NB 4330 & TABLE NB-4622.1-1 for additional details .
3. If this repair is on equipment which is in service, or the repair have to be developed for future in situ repair, follow NB-4622.9 to qualify Temper Bead Weld Repair. Temperbead repair is a very special technique, especially for nuclear and has to done with utmost criticality.
Note : the weld procedures shall be qualified on the same base metal, as these steels are unclassified steel as per Sec-IX, you can not substitute them with ASME equivalent materials, unless agreed by the client.
Thanks .
Pradip Goswami,P.Eng.
Welding & Metallurgical Engineer/Specialist
Ontario Power Generation Inc.
Email-pgoswami@sympatico.ca,
From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Maulik Thakkar
Sent: Saturday, September 18, 2010 12:37 PM
To: Materials & Welding
Cc: bhavesh.patel@isgec.com
Subject: Re: [MW:7082] 15 Mo3
Code of construction is SEC III Division 1 subdivision NB.
Repair depth up to 15-20 mm.
PWHT is required
On Sat, Sep 18, 2010 at 6:20 PM, Maulik H. Thakkar <mlkthakkar2@gmail.com> wrote:
Dear all,
Is it required to qualify the new PQR for simulated repair for the
15Mo3 # 20MnMoNi55 joint?
If yes/no whatever justified by proper evidence.
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REGARDS,
MAULIK H. THAKKAR
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