Tuesday, September 22, 2009

[MW:3276] Re: [MW:/] Re: 3238] Shelf life of Low hydrogen electrodes


Dear all,

Our recommendation regarding storage and handling of low hydrogen covered electrodes is as follows:

Electrodes that have been kept in air tight package, i.e. for ESAB vacuum packed, which has not lost its vacuum, can be used right away regardless of storage time. Electrodes packed in other types of packages should be redried before use.
Redry at 350°C, 2 hrs. or read and follow instruction on the label. Store the electrodes after redrying at a lower temperature. Our recommendation is 150°C.  Note that redrying at lower temperature than recommended will not return the electrodes to their original low hydrogen state.
The electrodes can be kept for a long time at 150°C, without any deterioration, but at 350°C, they will slowly oxidize. Do not keep the electrodes at that temperature longer than necessary. Our tests have shown that after a couple of days at 350°C, basic low hydrogen electrodes start to show signs of deterioration due to oxidation. There will be a loss of manganese and silicon in the weld metal, which will affect mechanical properties.
The electrodes can be redried several times if the holding time at the redrying temperature is respected. 3 times or more should be no problem. Up to 24 hrs.total holding time at 350°C is OK.

Regarding maximum shelf life we recommend 3 years, mainly because there may have been changes in formulation and properties during that time, i.e. the old electrodes may not be the same as what is sold now. For really old electrodes it is difficult to find documentation. I would not recommend any test type bending or dropping, definitely not for low hydrogen electrodes.

Best regards,

Claes Gillenius
Development Engineer, MMA. (Spec. stainless and non Fe-alloys)
Direct tel:  +46 (0)31 509315
Mobile +46 (0)707532012
Company                ESAB AB
Address                  Box 8004, 402 77  Gothenburg, Sweden
                                 LindholmsallĂ©n 9
Company  reg number        556005-7738



Shashank Vagal <nach_sam@yahoo.com>
Sent by: materials-welding@googlegroups.com

2009-09-22 07:30

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[MW:3271] Re: [MW:/] Re: 3238] Shelf life of Low hydrogen electrodes





Raj,
Thanks, that is interesting. Such practical approaches borne out of experience are very useful guidelines.
SV

--- On Tue, 22/9/09, rajagopal kannan <rajagopal.kannan@gmail.com> wrote:


From: rajagopal kannan <rajagopal.kannan@gmail.com>
Subject: [MW:/] Re: 3238] Shelf life of Low hydrogen electrodes
To: materials-welding@googlegroups.com
Date: Tuesday, 22 September, 2009, 9:50 AM

Dear Shasank,
As stated in this tread earlier, ASME Sec. IX code does not state anything about this. we have to go by tthe manufacturer's instruction only.
But, I have come across a practice to test its usability. But I can't provide you any type of written reference. It was found in one of the vendor's system procedures.

Electrodes considered as old, which doesn't loose flux when dropped vertically from 1 meter height from ground is suitable for welding.

You can try this.
Thanks and Best Regards,
K.Rajagopal



On Fri, Sep 18, 2009 at 7:16 AM, Shashank Vagal <nach_sam@yahoo.com> wrote:

Hi,
All Ok and accordingly noted. How about the shelf life, if the packing is not damaged, do we follow manufacturer's instructions or is there any expiry date for it? What is the general approach here, in absence of anything else?
Regards,
Shashank Vagal

--- On Thu, 17/9/09,
claes.gillenius@esab.se <claes.gillenius@esab.se> wrote:

From:
claes.gillenius@esab.se <claes.gillenius@esab.se>
Subject: [MW:3240] Re: 3238] Shelf life of Low hydrogen electrodes


To:
materials-welding@googlegroups.com
Date: Thursday, 17 September, 2009, 4:11 PM



If the electrodes are packed in air tight packages they can be used right away. If not, redry the electrodes in the way the manufacturer recommends, normally at a temperature around 300 - 350 °C.

Air tight packages are for example vacuum packages. If such a package is damaged and the vacuum lost, redy the electrodes. Redrying returns the electrodes to it´s original state.


Best regards,


Claes Gillenius
Development Engineer, MMA. (Spec. stainless and non Fe-alloys)
Direct tel:  +46 (0)31 509315
Mobile +46 (0)707532012
Company                ESAB AB
Address                  Box 8004, 402 77  Gothenburg, Sweden
                                LindholmsallĂ©n 9
Company  reg number        556005-7738




"Bathula Raghuram (Mumbai - PIPING)" <R.Bathula@ticb.com>
Sent by:
materials-welding@googlegroups.com

2009-09-17 12:17




To
<materials-welding@googlegroups.com>
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Subject
[MW:3239] RE: 3238] Shelf life of Low hydrogen electrodes







Consult the consumable manufacturer, may be shelf life revalidated with additional testing. Code does not specify the shelf life, but the manufacturer does.





From:
materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Ravindra T
Sent:
Thursday, September 17, 2009 3:28 PM
To:
materials-welding@googlegroups.com
Subject:
[MW:3238] Shelf life of Low hydrogen electrodes

 
Dear All

 
Our contractor has brought low hydrogen electrodes (E 7018 & 8018) which are manufactured in 2007 for welding station piping in one of our intermediate pump station of our cross country pipeline project. I would like to know whether these electrodes can be used now?. Is there any reference in ASME code regarding the expiry/ shelf life of Electrodes?
 
Please advise me in this regard.

 
Thanking you all in advance

 
Ravindra

Senior Project Engineer






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This communication and any files transmitted with it contain information which is confidential and which may also be privileged. It is for the exclusive use of the intended recipient(s). If you are not the intended recipient(s), please note that any disclosure, copying, printing or use whatsoever of this communication or the information contained in it is strictly prohibited. If you have received this communication in error, please notify us by e-mail or by telephone as above and then delete the e-mail together with any copies of it. ESAB does not accept liability for the integrity of this message or for any changes, which may occur in transmission due to network, machine or software failure or manufacture or operator error. Although this communication and any files transmitted with it are believed to be free of any virus or any other defect which might affect any computer or IT system into which they are received and opened, it is the responsibility of the recipient to ensure that they are virus free and no responsibility will be accepted by ESAB for any loss or damage arising in any way from receipt or use thereof.

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