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Monday, February 8, 2010

RE: [MW:4244] Welding Electrode Expire Date


Our recommendations regarding shelf life are based on two facts:

1. We havet an internal shelf life limit of 5 years, because the products may become obsolete. There may have been changes in material requirements and / or welding performance during the years.

2. Deterioration due to the effect of moisture:
Electrodes packed in hermetically sealed packages, like Esab´s vacuum pack, are not effected and can be stored more or less for ever, provided the vacuum is not lost. Other types of packages gives much less protection. If electrodes, or flux, are stored in a dry environment, that is air with relative humidity around 40% or less, very little deterioration takes place. In high humidity atmosphere moisture pick-up and deterioration is rather rapid. Rebaking of stainless and mild steel basic and low hydrogen electrodes and flux will restore their properties.

Flux in big-bags and electrodes on fully loaded pallets will not be affected by moisture as rapidly as flux in smaller containers or electrodes in loose packades. The moisture has to be transported from the atmosphere into the material, and this is a rather slow process.

All together the 3 year rule is a good rule and material more than 5 years old has to be stored under dry condtions if to be used. Mechanical properties and chemical composition of the weld metal are not affected by storage time.

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



"pgoswami" <pgoswami@quickclic.net>
Sent by: materials-welding@googlegroups.com

2010-02-04 07:17

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materials-welding@googlegroups.com

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Subject
RE: [MW:4205] Welding Electrode Expire Date





Hi Louis & Yanferizal,
 
Thanks for your query and answers.
 
Discussion thread, (MW-3238, Sept-2009) Shelf life of Low hydrogen electrodes provides some snapshots of intense discussion on the above topic.
 
It's true that boiler or pressure vessel codes or structural welding codes do not specify the shelf-life or expiry dates of welding electrodes. For example, ASME Nuclear Codes Sec-III, Clause & NB, NC-2440 specifies that:- Suitable storage and handling of electrodes, flux, and other welding materials shall be maintained. Precautions shall be taken to minimize absorption of moisture by fluxes and cored, fabricated, and coated electrodes.
 
The shelf-life of welding electrodes to a great extent depends on electrode manufacturer's methods, quality control procedure and how electrodes are handled. Depending on the coating type, packing (hermetically sealed or not), storing methods and ambient conditions, humidity etc, electrodes may last long or less. However as a good practice and based on electrode manufacturer's guidelines it may be worth considering:-
 
·        Solid Wires, GTAW/GMAW-No shelf Life.  
·        Cored Wire –FCAW-  No shelf life
·        SMAW – The rule should be FIFO (First in First Out). Electrodes where the coating shows sign of flaking, cracks etc certainly should be discarded without much thoughts. Electrodes not older than 2-3 years but in good condition may be used. If required the diffusible hydrogen test could be repeated. Electrodes older than 3 years generally should not be used as a good engineering rule.
·        SAW Fluxes- Shelf life 2-3 years maximum subject to the flux condition and amount of fine particles/dust generated and behavior during welding
 
It would be definitely useful to get the inputs from other forum members, especially from consumable manufacturing industries.
 
Thanks.
 
Pradip Goswami, P.Eng
88,Garth Trails Crescent
Hamilton,Ontario, L9B2X1,Canada
Email-pgoswami@sympatico.ca
Email-pgoswami@quickclic.net
Tel-905-679-9677



From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of A D
Sent:
Wednesday, February 03, 2010 12:39 AM
To:
materials-welding@googlegroups.com
Subject:
Re: [MW:4192] Welding Electrode Expire Date

 

Hi,
       Electrode (SMAW) expiry detail is not given by any codes. May be you can check
with your electrode manufacturer.
wire consumables (without flux) is not issue for expiry, we can use anytime if we keep
in proper storage.
In stick electrodes, flux may be loosened (unbounded) due to long storage.
 
 
Louis

--- On Wed, 3/2/10, yferizal@gmail.com <yferizal@gmail.com> wrote:


From: yferizal@gmail.com <yferizal@gmail.com>
Subject: [MW:4187] Welding Electrode Expire Date
To: materials-welding@googlegroups.com
Date: Wednesday, 3 February, 2010, 8:13 AM

Dear All,
Anyone could inform me the welding electrode expiration date since manufacture (eel 1 year, 2 year etc)  it is not mentioned in the electrode certificate.
Is there any statement in Code/standard for this?
Best Regards,

Yanferizal
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