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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