Monday, August 23, 2010

[MW:6647] RE: 6628] MW:6620- ELECTRODE STRENGTH REQUIREMENT FOR PLATE GR65.

Thanks you very much for the information.

 

Since the actual tensile strength of the material is more the minimum required value, is there in provision/clause in eth code which can justify the use of this electrode?

 

Regards,
Syed Moin

From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of pgoswami
Sent: Sunday, August 22, 2010 6:47 PM
To: materials-welding@googlegroups.com
Subject: [MW:6628] MW:6620- ELECTRODE STRENGTH REQUIREMENT FOR PLATE GR65.

 

Hello Moin,

 

Please see the guidelines of AWS/ASME on SAW wire flux classification requirements for C.S. F6A0-EM12 classification can generate weld metals of nominal tensile strength/s as shown in Table -5U(see below). However one has consider the minimum achievable tensile strength for safe design basis.

 

NOTE:- One brand of filler metal of EM12 specification may generate 5 different Tensile strengths if tested with 5 different fluxes.

 

As the base metal to be welded is of 65ksi(65000 psi) nominal tensile strength, it would be most appropriate to select welding consumable+fluxes  to F7A0-EM12  or F7P0-EM12 classification (if there is requirements of PWHT).  

 

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 Raghuram Bathula
Sent: Sunday, August 22, 2010 12:04 AM
To: materials-welding@googlegroups.com
Subject: Re: [MW:6620] ELECTRDOE STRENGHT REQUIRMNET FOR PLATE GR65

You must select consumables which are having specified min Tensile strength as per the component specification (F7A0 could be the right choice in your case). Every batch of consumables will not guarantee you the same UTS, in this case you can consult the manufacturer and if they can provide you the same classification with Min 65Ksi (probably they can certify with G classification) and you can convince your client in this way.

On Sun, Aug 22, 2010 at 9:19 AM, Syed Moin <Syed.Moin@gerabgroup.com> wrote:

Dear Members,

Appreciate if you could provide me some information on the issue, During a PQR, manufacturer has used electrode F6A0-EM12 to weld plates A516 Gr. 65, welding procedure is SAW. Below is the comparison, between the tensile strength of the electrode,

comparison table                               
        WELDING FLUX F6A0       PLATE   flux certificate(see attachment)        Strength of the plate material 
        REFER TO SFA 5.17       ASTM A516, GR65 test result     Test Result    
        Tensile Tensile tensile         tensile
        60,000~80,000 psi       65000~85,000 psi         72289 psi (500MPa)     68875 psi (475 Mpa)    
                                       
Our client says that the selected electrode is not suitable for Gr. 65c plates. Is it correct?

They say that the electrode shall be selected considering the minimum strength ( for this electrode minimum strength is 60, 000 PSI), and therefore it is not suitable for a plate with minimum strength value equal to 65000 PSI .

As you can see in the above  table tensile test value for the electrode is 72289 PSI, but still the client is not ready to accept the use of this electrode.

Please advise.

Regardsa

MS

 


_

--
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.

______________________________________________________________________
This email has been scanned by the MessageLabs Email Security System.
For more information please visit http://www.messagelabs.com/email
______________________________________________________________________

--
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.


______________________________________________________
CONFIDENTIALITY NOTICE: This electronic mail transmission may contain information that is confidential, privileged, proprietary, or otherwise legally exempt from disclosure and is intended only for the use of the recipient named above. We do not waive confidentiality in the event this mail was transmitted wrongly. If you have received this communication in error, and are not the intended recipient, you are hereby notified that you are prohibited from reading, printing, copying, or disseminating this message, any part of it, or any of the attachments it may carry. If you have received this message in error, please destroy all electronic and paper copies and notify the sender immediately of the inadvertent transmission. We would like to advise you that we would not waive any of our privilege for taking action against you in the event the confidentiality of this message has been compromised. Thank you for your cooperation
________________
This email has been scanned by the MessageLabs Email Security System.
For more information please visit http://www.messagelabs.com/email
______________________________________________________________________

No comments:

Re: [MW:34832] Inquiry about Single Bevel with Back Grinding

Dear Uday, As per your question that one is called with backing only,Simple both side you are welding it is backing with strip or without st...