Wednesday, September 23, 2009

[MW:3290] Re: [MW:/] Re: 3238] Shelf life of Low hydrogen electrodes

I have one question,

SItuation: I open a pack of electrodes. The pack's lost vacuum. So i
redry the electrodes at specific conditions (e.g 350ºC; 2 hrs) and
before that, keep them on a 150ºC electric hot house / electrode
dryer. Ok. Supose that the energy breaks down, and the ambient gets
moisture. Can i repeat the entire procedure and guarantee electrodes
properties? If the energy restart in a few minutes (e.g 20 min) and if
the temperatures variation's not great (- 30ºC), its necessary to
redry at 350ºC?

How many times can i redry the electrodes?


On Sep 22, 5:59 am, claes.gillen...@esab.se wrote:
> 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
> Lindholmsallén 9
> Company reg number 556005-7738
>
> Shashank Vagal <nach_...@yahoo.com>
> Sent by: materials-welding@googlegroups.com
> 2009-09-22 07:30
> Please respond to
> materials-welding@googlegroups.com
>
> To
> materials-welding@googlegroups.com
> cc
>
> Subject
> [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.kan...@gmail.com> wrote:
>
> From: rajagopal kannan <rajagopal.kan...@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_...@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.gillen...@esab.se <claes.gillen...@esab.se>
> wrote:
>
> From: claes.gillen...@esab.se <claes.gillen...@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
> Lindholmsallén 9
> Company reg number 556005-7738
>
> "Bathula Raghuram (Mumbai - PIPING)" <R.Bath...@ticb.com>
> Sent by: materials-welding@googlegroups.com
> 2009-09-17 12:17
>
> Please respond to
> materials-welding@googlegroups.com
>
> To
> <materials-welding@googlegroups.com>
> cc
>
> 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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