Sunday, September 19, 2010

[MW:7092] 15 Mo3

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,

pgoswami@quickclic.net


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.

--
To post to this group, send email to materials-welding@googlegroups.com
To unsubscribe from this group, send email to materials-welding-unsubscribe@googlegroups.com
For more options, visit this group's bolg at http://materials-welding.blogspot.com/
The views expressed/exchnaged in this group are members personel views and meant for educational purposes only, Users must take their own decisions w.r.t. applicable code/standard/contract documents.




--

REGARDS,

MAULIK H. THAKKAR

 

 

--
To post to this group, send email to materials-welding@googlegroups.com
To unsubscribe from this group, send email to materials-welding-unsubscribe@googlegroups.com
For more options, visit this group's bolg at http://materials-welding.blogspot.com/
The views expressed/exchnaged in this group are members personel views and meant for educational purposes only, Users must take their own decisions w.r.t. applicable code/standard/contract documents.

No comments:

[MW:34820] RE: 34813] Clarification in Rate of heating and cooling.

Hello,   Please see the response below.   Regards.   P. Goswami, P. Eng, IWE.   From: materials-welding@googlegroups.com <materials-weld...