Carlos,
The damage looks to be:- thermal stress cracks (picture 1) and heavy steam erosion/gouging(picture-2). If the base metal is A-216 WCB and A-217 WC9 both could be repair welded by E-9018-B3 SMAW welding consumables followed by PWHT as a conventional technique. You may choose GTAW and FCAW also as required. Turbines are manufactured to OEM specifications however as it’s connected to B31.1 piping, this code is commonly followed for weld repair , PWHT and NDE
I’m sure your organization follows the NBIC code for repair and rerating. NBIC have a few suggested methods for “Temperbead Repair” techniques , which does not call for PWHT following repair. Method-4, repair of P4/P5A material with matching electrodes is one option. Method-5 , repair with ”cold welding” process using Inconel-182 electrodes is another option. I’ve come across this cold-welding practice, through interaction with UK utility RWE.
If you require further help feel free to discuss or drop an email, in my personal email. Turbine issues often are proprietary and better not to share information in public forum.
I am attaching an article on "cold welding " technique, which may be of interest to you.
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 Luis Carlos Flores Rivera
Sent: Tuesday, August 31, 2010 12:21 PM
To: materials-welding@googlegroups.com
Subject: RE: [MW:6813] MW: 6788- A 217 Gr WC9
Hi Pgoswami,
There is no other material to be welded.
We are working over Turbine's casing and we found those damages you can see on attached pictures.
By metalography we know they were fabricated on A-216 WCB and A-217 WC9
We appreciate your comments and suggestions
L. Carlos Flores
Piping Team Leader
Oficina:(993) 310 8100 Ext. 106
Celular:(993) 250 6610
From: pgoswami@quickclic.net
To: materials-welding@googlegroups.com
Subject: [MW:6789] MW: 6788- A 217 Gr WC9
Date: Mon, 30 Aug 2010 22:35:33 -0400
Hi Luis,
The material is 2.25Cr-1Mo steel (P 5A Gr 1) in the shape of casting. What' the other material to be welded? A rule of thumb could be :-
- A 217 Gr WC9 to P4 material-- Use P4 matching electrode for buttering, e.g-E 8018/16 B2 or E-7018B2 or GTAW filler of equivalent specification. You may use E-9018B3 or 8018B3L also, in that case buttering sequence may not be needed.
- A 217 Gr WC9 to S.S- Use Inconel-182(E NiCrFe-3) or matching GTAW filler(ERNiCr-3) for buttering.PWHT the buttered area and P5 steel as recommended by design code followed by welding to P8 without further PWHT.
Note the above guidelines are only generalized rule. Buttering sequences and welding electrodes to be used would depend on what material gets welded to A 217 Gr WC9 and the code or specification requirements.
Note the precautions and welding parameters to be followed for buttering shall be identical to a groove weld.
Thanks.
Pradip Goswami,P.Eng.
Welding & Metallurgical Engineer/Specialist
Ontario Power Generation Inc.
Email-pgoswami@sympatico.ca,
pgoswami@quickclic.net
-----Original Message-----
From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Luis Carlos
Sent: Monday, August 30, 2010 12:37 PM
To: Materials & Welding
Subject: [MW:6788] A 217 Gr WC9
Hello,
Could someone tell me please what is the best filler metal to make a buttering over A-217 Gr WC9 base metal.
Are there special recommendations?
I will appreciate answers!
Luis Carlos
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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.
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THIS MESSAGE IS ONLY INTENDED FOR THE USE OF THE INTENDED RECIPIENT(S) AND MAY CONTAIN INFORMATION THAT IS PRIVILEGED, PROPRIETARY AND/OR CONFIDENTIAL. If you are not the intended recipient, you are hereby notified that any review, retransmission, dissemination, distribution, copying, conversion to hard copy or other use of this communication is strictly prohibited. If you are not the intended recipient and have received this message in error, please notify me by return e-mail and delete this message from your system. Ontario Power Generation Inc.
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