RE: [MW:6664] ELECTRDOE STRENGHT REQUIRMNET FOR PLATE GR65

 
Most welding standards some clauses say that the contractor is responsible of the works.
 
If you want to make sure that your weldments are going to be more resistant than the parent metal you should qualify WPS using the highest strenght production base metal and no matter if the electrode is a clasification with less nominal strenght than the base metal.
 
If in the tensile strenght the specimen brakes in base metal that means that the weld is more resistant.
 
If we are professionals we must do that, and any problem that can happen in service we aren't guilty because the weld was more resistant.
 
Please see below a extrac from DNV-OS-F101-2008
 

C 400 Batch testing of welding consumables for pipeline

girth welds

401 A consumable batch is defined as the volume of product

identified by the supplier under one unique batch/lot number,

manufactured in one continuous run from batch/lot controlled

raw materials.

402 Batch testing shall be conducted to verify that consumables

that were not tested during qualification of the welding

procedure will give a deposited weld metal nominally equivalent

to those batches used for welding procedure qualification,

with respect to chemistry and mechanical properties.

 

C 300 Mechanical properties

Pipeline girth welds

301 Weld metal in pipeline girth welds shall, as a minimum

have strength, ductility and toughness meeting the requirements

of the base material.
 

306 For girth welds, all batches of consumables used in production

including possible wire / flux combinations should be

qualified by testing during welding procedure qualification.

Eduardo Calva

Table C-2 Essential variables for welding of pipeline girth welds

8 Welding consumables

Electrode or filler metal a Any change of diameter or cross section area

b Any change of type classification and brand (brand not applicable for bare wire)

c Any use of a non tested welding consumables batch when batch testing is required

d Any use of a welding consumables batch with a reduction in tensile or impact properties of more than

–10% from the batch used for WPQR when batch testing is not required


 

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Date: Mon, 23 Aug 2010 16:49:09 +0000
To: materials-welding@googlegroups.com
Subject: Re: Re: [MW:6661] ELECTRDOE STRENGHT REQUIRMNET FOR PLATE GR65
From: dineshverma08@rediffmail.com


pl clarify why E8018 MIN TENSILE 80,000 PSI ELECTODE IS BEING USED IN MANY OF THE LINE PIPE WELDING OF GRADE API 5L X 70 WHOSE MIN TENSILE IS 82,000 PSI
REGARDS
DINESH
On Mon, 23 Aug 2010 21:57:53 +0530 wrote
>Sujeeth,
              In all PQR testing as per ASME SEC-IX requires Tensile strength only .How can you calculate based on Yield strength.
 
vaithiyanathan

 
On 8/22/10, Sujeet Sangle wrote:



We should select the consumable with the YS and no TS properties .
 
Regards,
 
Sujeet
 

From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of B.Vaithiyanathan

Sent: Sunday, August 22, 2010 5:56 PM
To: materials-welding@googlegroups.com

Subject: Re: [MW:6625] ELECTRDOE STRENGHT REQUIRMNET FOR PLATE GR65

 

Always the welding electrode should meet Base material strength .By this way the electorde slection should be F7A0 .

 

Regards,

Vaithiyanathan,

 



 

On 8/22/10, Syed Moin 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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