Thursday, July 19, 2012

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.


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
 
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