Hi Biswajeet,
Thanks, sir. I could get at it a little later. I had a mistake in the URL. But still, it does not exactly help me as to what we do now. The plates are in their places, can not be removed nor replaced (no extra plates available), nor can we afford too much repairing for we may damage the plate. Physically and otherwise, I mean.
Perhaps build up of the repaired edges could be the solution...? With which electrode? How can we justify all that extra heat input?
Thanks all of you for your time and efforts,
Shashank Vagal
--- On Tue, 12/6/12, Biswajit Mukherjee <BMukherjee@lntenc.com> wrote:
From: Biswajit Mukherjee <BMukherjee@lntenc.com>
Subject: RE: [MW:14522] How many times can a weld be repaired without impairing its quality?
To: materials-welding@googlegroups.com
Date: Tuesday, 12 June, 2012, 9:07 AM
Sashank, The TWI article that you quoted below is still there. Fearing a copyright issue I did not attach a scanned copy of it. But just google it.... There's a somewhat similar q&a in the link below: http://www.ndt.net/forum/thread.php?admin=&forenID=1&msgID=38203&rootID=38032 Regards,
BM From: "pgoswami" <pgoswami@quickclic.net> To: <materials-welding@googlegroups.com> Cc: <nach_sam@yahoo.com> Date: 12-06-2012 08:20 Subject: RE: [MW:14518] How many times can a weld be repaired without impairing its quality? Sent by: materials-welding@googlegroups.com
Hi Sashank, The issue is with 9% Nickel steel. This steel has very specific design and application requirements, typically for Cryogenic services, minus 160 Deg C or below. I would think as a bare minimum the following should be followed for any repair:-Cutting out the existing weld and reusing the same plate--This may be done, however the following shall be followed:- 1. carefully cut the weld with controlled flame, with minimum possible kerfs width. 2. grind at least 1/8" off from the gas cut surface and beveled to sound base metal. 3. perform LPI on the WEP. 4. Fit-up and weld as per the original weld procedure followed. 5. PWHT as required. 6. The combined PWHT cycle (original weld +repair) shall not exceed the PWHT cycle of original base simulation coupon results. 7. In addition it must not exceed the PWHT (T&T) followed while qualifying the PQR. 8. Usually all 9% Nickel steel has to procured with the simulation heat treatment results. 9. Total PWHT-T&T following original weld and repair should not exceed results of the simulation test coupon. It's not clear from the query what was the welding consumable used. But Inconel -112(E-NiCrMo-3) or Kobelco's product (e.e hastelloy C-276) would be the recommendations. Hope this would clarify the query. Thanks. Pradip Goswami,P.Eng.IWE Welding & Metallurgical Specialist Ontario, Canada. Email-pgoswami@sympatico.ca, pgoswami@quickclic.net
From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Tarantula Ghosh
Sent: Thursday, June 07, 2012 11:38 PM
To: materials-welding@googlegroups.com
Subject: Re: [MW:14493] How many times can a weld be repaired without impairing its quality?
Dear friends,
What we must do to take care of this issue is this: When running a PQR, also run additional repair PQRs. Repair once, twice, thrice..... with WPS conditions and subject welded coupons to mechanical tests (impact mainly) and see at what level you have to stop. Two times repair is just an arbitrary statement, not supported anywhere but what I suggest is from the point of view of a good engineering practice and more reliable.I hope I am not reinventing the wheel !
Comments, please.
Thankfully,
TG
On Thu, Jun 7, 2012 at 10:04 AM, Muthu Samy <jenieragav@gmail.com> wrote: Dear Vagal,
The repair can be attended for two times only and cut and re weld if repair found again.  Muthusamy@balu
On 6 June 2012 07:33, Shashank Vagal <nach_sam@yahoo.com> wrote: Gents,
A very sensitive issue for most of us, I am sure from time to time, particularly when we are working at site with limited inventories at a given time: How many times can a weld be repaired without impairing its quality? We are facing a cut out of plate butt weld (9% Ni) with no additional plates if required to replace the welded ones if they are condemned.
There was an article some time ago addressing this issue (
http://www.twi.co.uk/services/technical-information/faqs/material-faqs/faq-how-many-times-can-a-weld-be-re-weldwed), but unfortunately it seems to have been taken off from TWI site.
Please advise.
Best regards,
Shashank Vagal | --
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Tarantula
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[attachment "20.jpg" deleted by Biswajit Mukherjee/LNTENC]
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