[MW:14946] Diffusible Hydrogen Test of Low Hydrogen Electrode

Dear Mr. John Hennings,

Thanks for the info. and I did not mean any offense. 

I have also used  lots of E 6010, E 6013, E 7018 type electrodes when I was on deputation in West Asia.  They are really good, easy to use and  available in quantity. 

In India they are  imported, otherwise only packed cartons are available due to its cost factor. Some manufactures use the containers mostly for export requirement.

In south East Asia and other countries  including South Korea, both are available.

sridhar.

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From: John Henning <jhenning@deltak.com>
To: materials-welding@googlegroups.com
Sent: Monday, 23 July 2012 10:10 PM
Subject: RE: [MW:14935] Diffusible Hydrogen Test of Low Hydrogen Electrode

Sridhar,

 

I appreciate the information.  I am only familiar with standard US practice and practices I have witnessed in Japan and Korea.  In these countries, I have never seen low hydrogen electrodes delivered in any other condition than fully factory packed in hermetically sealed containers.  It is standard practice in the US to open the hermetically sealed container and immediately place the electrodes into rod holding ovens (obviously there can be fly-by-night operations that could do it differently).   As a point of reference In the places I have worked in the US (35+ years), hermetically sealed containers that were damaged are typically discarded. 

 

To aid in my understanding, is green supply typical for all manufacturers in India including the major brands such as ESAB, Lincoln, Kobe, Hyundai etc.?  In your experience is green supply typical in India, Malaysia, Thailand etc.?  What about the mid-east – Saudi Arabia, Dubai, the Emirates?   

 

John A. Henning

Welding & Materials

 

From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of c sridhar
Sent: Saturday, July 21, 2012 11:05 AM
To: materials-welding@googlegroups.com
Subject: Re: [MW:14924] Diffusible Hydrogen Test of Low Hydrogen Electrode

 

hermetically sealed containers, no re-drying or re-baking is required.  In the US it is typical for all low hydrogen electrodes to be shipped in such containers.  Additional drying typically is detrimental to the coating and should not be performed needlessly.

 

1. Hermetically sealed containers are not manufactured /available  in most of the parts of Asia. They could be common

    in US but,  imported on a larger shipment basis only into other countries.

2. Even the hermetically sealed containers, when opened and exposed to atmosphere for more than 6 to 8 hrs, may

    require additional drying if it is suspected of picking up moisture.

3. For non-radiography quality joints (say, structural) hermetically sealed are not used due to its high cost factor over

    normally packed  electrodes.

4. Only E 6010, E6013  and other typical type of electrodes do not require re-drying  at any time.

5. This is the reality.

.

I have been told, that in some places, low hydrogen electrodes may be shipped in the "green" condition to minimize damage to the coating  due to rough handling.  If electrodes are in such a condition, only then is drying of the as received electrodes required.

 

This is why re-drying is done, as most of the manufactures use card board boxes (which are said have 6% moisture content i.e., equivalent to 20-30 ml of H2 and  more than specified quantity of diffusible  hydrogen level) for packing. Prevention of defects are cost effective than waiting for it to occur. 

 

sridhar.

------------------------------------------------------------------------------------------

 

 

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From: John Henning <jhenning@deltak.com>
To: materials-welding@googlegroups.com
Sent: Thursday, 19 July 2012 9:16 PM
Subject: RE: [MW:14902] Diffusible Hydrogen Test of Low Hydrogen Electrode

 

These replies are incorrect.

 

Please review the highlighted sections of the attached portions of A/SFA-5.1 and A/SFA-5.01, procurement guidelines.

 

In general the filler metal manufacturer only needs to perform testing on a representative lot of material.  As long as the manufacturing process does not change, additional testing is not required.  Unless specified otherwise in the purchase order, material will be supplied per Schedule 1/F of Table 1 in SFA-5.01.

 

If you want specific heat/lot testing you must specify that in your purchase order.  You will pay extra for this paper (even though it is more than likely that the filler metal manufacturer has already performed it as a part of their routine).

 

Regarding re-drying or re-baking.  If the electrodes are supplied in hermetically sealed containers, no re-drying or re-baking is required.  In the US it is typical for all low hydrogen electrodes to be shipped in such containers.  Additional drying typically is detrimental to the coating and should not be performed needlessly.

 

I have been told, that in some places, low hydrogen electrodes may be shipped in the "green" condition to minimize damage to the coating  due to rough handling.  If electrodes are in such a condition, only then is drying of the as received electrodes required.  

 

John A. Henning

Welding & Materials

 

From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of c sridhar
Sent: Thursday, July 19, 2012 2:46 AM
To: materials-welding@googlegroups.com
Subject: Re: [MW:14900] Diffusible Hydrogen Test of Low Hydrogen Electrode

 

If the diffusible H2 content  specified in the TC falls within the allowable range and acceptable no need to check in every batch.

 

If the TC values are questionable or if the cold/H2 cracks are noticed often in the weld or if the job is sensitive type, you can cross check the values once in a while.

 

But,  it is mandatory to  to re dry/bake  all the LH electrodes in the electrode drying oven prior to its use to reduce the moisture content in the coating and reduce the hydrogen level .

 

sridhar.

 

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From: prem nautiyal <prem_nautiyal26@yahoo.com>
To: materials-welding@googlegroups.com
Sent: Wednesday, 18 July 2012 10:33 PM
Subject: Re: [MW:14892] Diffusible Hydrogen Test of Low Hydrogen Electrode

 

Yes. Every low hydrogen electrode e.g. E7018, Batch Test certificate must specify this value. Almost all the reputed consumable manufacturer's check the diffusible hydrogen and report the values in their batch TC. Please refer Table 11 in SFA-5.1 of ASME Sec. II-C. Also if you have specified the diffusible hydrogen content requirement in your welding consumable procurement specifications then it is mandatory for consumable manufacturer to report the values.   Regards   Prem Nautiyal Cell: 9769316004 --- On Wed, 7/18/12, Biplab Pal <biplab.mech@googlemail.com> wrote: From: Biplab Pal <biplab.mech@googlemail.com> Subject: [MW:14886] Diffusible Hydrogen Test of Low Hydrogen Electrode To: materials-welding@googlegroups.com, "chandan.majumdar" <chandan.majumdar@sgs.com>, "JALADHAR JENA" <jdjena2006@yahoo.co.in>, "pinaki boxi" <boxi.pinaki@gmail.com> Date: Wednesday, July 18, 2012, 9:59 AM Dear Experts, I have a doubt, Is it mandatory to check the diffusible hydrogen test for every batch of Low Hydrogen electrode as per sec-II part c. Please give me the code reference. -- Thanks & Regards Biplab Pal Mechanical Inspector (PMT) YASREF Project E-mail:   biplab.mech@gmail.com   Information in this email and any attachments is confidential and intended solely for the use of the individual(s) to whom it is addressed or otherwise directed. Please note that any views or opinions presented in this email are solely those of the author and do not necessarily represent those of the Company. Finally, the recipient should check this email and any attachments for the presence of viruses. Myself accepts no liability for any damage caused by any virus transmitted by this email.   -- To post to this group, send email to materials-welding@googlegroups.com To unsubscribe from this group, send email to materials-welding+unsubscribe@googlegroups.com For more options, visit this group's bolg at http://materials-welding.blogspot.com/ The views expressed/exchnaged in this group are members personel views and meant for educational purposes only, Users must take their own decisions w.r.t. applicable code/standard/contract documents.

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