[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

 

 

 

 

 

 

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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

_

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