Thank you very much for your valuable inputs.
I have finally decided to go with double layer.
Best Regards
Jaspal Singh
Assistant Manager-Welding Technology
Certified Welding Inspector
Pressure Vessel Division
ISGEC-Yamunanagar
Haryana-INDIA135001
www.isgec.com
jaspal_singh@isgec.com
919996624244
On Nov 16, 7:54 am, <pgosw...@sympatico.ca> wrote:
> Gents,
>
> The subject is interesting.I had some chance to work at early part of my career.
> Both SAW-SC & ESSC generates very high deposition high quality weld overlay. From a welding engineers perspective SAW-generates more base metal penetration and resultant more dilution, while in ESSC base metal dilution is minimized however the deposition is greatly increased over SAW-SC.
>
> Looking at the problem I feel the following techniques would be appropriate:-
>
> Deposition on the heat exchanges shell-- Single pass ESSC with magnetic stirring
>
> Deposition on heat exchanger tube sheets-- Single or Multi pass ESSC with magnetic stirring, Single layer deposition would mean use of a high speed flux.
>
> Deposition on heat exchanger tube sheets-- First layer by SAW-SC followed by next layer of ESSC to improve the bonding.
>
> Deposition on heat exchanger tube sheets-- Both layers by SAW-SC , which had been the proven technique in the industry for many years.
> Options 2 ,3 & 4 are proposed with a bit of conservatism, considering :-
>
> Tube sheets as a rule are machined after application of over lay, in order to facilitate proper Tube to Tube sheet welds. Repair of overlay defects after machining could mean additional work.
>
> Controlling distortion of tube sheets.
> Controlling 3 mm of undiluted chemistry (say S.S 347) should not be a concern as the overlay thickness in breach lock exchanges generally tend to be usually 5/32" or more. However Ferrite is very easily affected by weld metal chemistry , which the consumable suppliers have to ensure at the supply and field mock up tests.
>
> I have attached some article on SAW-SC & ESSC so as to benefit all. The articles in ESABs Svetsaren on page 10 & 16 are quite appropriate to the present issue.
>
> Thanks
>
> Pradip Goswami,P.Eng
> Senior Engineer/Specialist(Welding-Metallurgy)
> Machine Dynamics & Component Integrity Dept.
> Engineering & Training Services Division
> ONTARIO POWER GENERATION Inc.
> PO Box-2000, RR-55(South)
> Nanticoke, Ontario,N0A1L0
> Tel:-(519) 587-2201, Ext 3107--in Nanticoke
> (416) 231-4111, Ext 5925--in Kipling,Toronto
> Fax: (519) 587-6814
> Email-pradip.gosw...@opg.com.
>
> From: pgosw...@sympatico.ca [mailto:pgosw...@sympatico.ca]
> Sent: Sunday, November 15, 2009 8:32 PM
> To: pgosw...@quickclic.net
> Subject: FW: [MW:3658] Re: 3653] RE: 3647] RE: 3645] RE: 3644] Breesh-Lock Heat Exchangers Weld overlay
>
> Date: Sun, 15 Nov 2009 08:33:06 +0400
> Subject: [MW:3658] Re: 3653] RE: 3647] RE: 3645] RE: 3644] Breesh-Lock Heat Exchangers Weld overlay
> From: chaitanya_puro...@yahoo.co.in
> To: materials-welding@googlegroups.com
>
> I agree to comments of P B Hegde and I also have the same experience where I have used 60mm strip with single layer and achieved 6 to 7mm height where top 3mm you can get easily undiluted chemistry.
>
> Ferrite is slight tricky issue where I was facing problem but again if you can ask supplier of consumable to give guarantee and demostration prior to start the job, which will help you to build confidence in your welding team.
>
> C. K. Purohit
> Eng-Tech Weld1
> Sr Welding Inspector
>
> 2009/11/14 PB HEGDE <hegde...@isgec.com>
>
> Dear Mr Singh
> I think Not to get panic with Single layer ESSC and With High speed Flux .
> It has been established in almost all DHDS reactors where you can achieve
> Undiluted chemistry for top 3 mm. with no problem at overlap. With Ferrite about 6-7% With disbanding test No defect at 482 C with fastest cooling rate.
> You can use for SS w/o magnetic stirrer for 30, 60 width strip and 90mm with magnetic stirrer
> In fact now a days most of the consultants prefer single layer ESSC and not
> SAW
>
> Regards
>
> Hegde p.B.
>
>
>
> -----Original Message-----
> From: materials-welding@googlegroups.com
>
> [mailto:materials-welding@googlegroups.com] On Behalf Of GERING, Erwin
> Sent: Saturday, November 14, 2009 2:15 PM
> To: materials-welding@googlegroups.com
> Cc: GERING, Erwin
> Subject: [MW:3653] RE: 3647] RE: 3645] RE: 3644] Breesh-Lock Heat Exchangers
> Weld overlay
>
> Hello mr Singh
>
> Please be careful to chose ES-process if surface will be machined (indications at overlap).
> Please be careful with ES high speed solution for 4,5 mm thickness in single layer : in this thickness cladding with a 24.12LNb strip the dilution will be relative low which will result in relative high ferrite contents which can be over 10%.
>
> Please contact for accurate advise/solution directly a producer of strip
> cladding flux like OERLIKON / AIR LIQUIDE WELDING
>
> With kind regards,
> Erwin GERING erwin.ger...@airliquide.com
> Corporate Product Manager SAW/ES wire/flux/strip
> AIR LIQUIDE WELDING
>
> -----Oorspronkelijk bericht-----
> Van: materials-welding@googlegroups.com
> [mailto:materials-welding@googlegroups.com] Namens PB HEGDE
> Verzonden: vrijdag 13 november 2009 13:17
> Aan: materials-welding@googlegroups.com
> Onderwerp: [MW:3647] RE: 3645] RE: 3644] Breesh-Lock Heat Exchangers Weld
> overlay
>
> Hi
> Single layer 347 weld overlay by ESSC is good solution and you can also try with Soudokay/Sandvik strip with High speed flux You should be able to achieve 4.5 thk weld clad with top 3 mm undiluted chemistry of 347 It is established process with nil disbanding. However if you want final weld thickness of 5mm after machining better to go for Double layer where you
> hould get w/o thk of 7 mm and at least 2 mm M/cing allowance to take care of distortion during welding .
>
> Hope this will solve your problem
>
> Regards
>
> Hegde P.B.
>
> -----Original Message-----
> From: materials-welding@googlegroups.com
> [mailto:materials-welding@googlegroups.com] On Behalf Of GERING, Erwin
> Sent: Friday, November 13, 2009 2:50 PM
> To: materials-welding@googlegroups.com
> Subject: [MW:3645] RE: 3644] Breesh-Lock Heat Exchangers Weld overlay
>
> Hello Mr Singh,
>
> Single layer strip cladding solution is possible for SS347 with ES and SA
> process.
> Depending on dimensions and requirements selection to be made :
>
> SA-strip:
> OERLIKON AST 300 - SUPRASTRIP 24 13LNb
> OERLIKON AST 347 - SUPRASTRIP 24 13LNb
>
> ES strip:
> OERLIKON ELT 300 - SUPRASTRIP 21 11LNb (low speed)
> OERLIKON ELT 300S - SUPRASTRIP 24 13LNb (high speed)
> OERLIKON ELT 347-1 - SUPRASTRIP 19 9LNb (low speed)
>
> In general the ES-strip cladding process can not garantue zero defects
> (PT-check) after machining in the ovelap zone. SA strip cladding process
> should be chosen in that case.
>
> With kind regards,
> Erwin GERING
> AIR LIQUIDE WELDING
>
> -----Oorspronkelijk bericht-----
> Van: materials-welding@googlegroups.com
> [mailto:materials-welding@googlegroups.com] Namens JASPAL SINGH
> Verzonden: vrijdag 13 november 2009 6:03
> Aan: Materials & Welding
> Onderwerp: [MW:3644] Breesh-Lock Heat Exchangers Weld overlay
>
> Dear all,
>
> I have query regarding the Weld Overlay in Breesh Lock Heat
> Exchanger.
>
> As per specifications it is required to give SS347 Weld- overlay with
> 3mm undiluted chemistry . It is written that weld overlay shall be
> lined & Faced. does it mean Strip cladding First then Machining.
>
> Secondly is it possible to offer single layer solution for the same.
>
> IS it required to machine the overlay in Breesh Lock Heat Exchanger.
>
> Thanks in advance
>
> Jaspal Singh
>
>
>
> sc-107.pdf
> 623KViewDownload
>
> sc-103.pdf
> 259KViewDownload
>
> Svetsaren_1_2007.pdf
> 3925KViewDownload
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