Dear all,
As it's knows the coating of Low Hydrogen Electrodes (basic electrodes) include CaCO3 and CaF2(Calcium Fluoride),ferroalloys (ferrosillicium, ferromaganese) and iron powder.
I would like to open a discussion about the arc(DCEN,DCEP) stability (effect of the CaF2,CaCo3 content of coating):
-the arc stability evaluated by conductivity of the arc gap B (B=I/Ut where I,U and T are respectively the current(A) Voltage(V)and ignition time(sec)of the arc.)
-CaCo3/CaF2 ratio influence of arc stability
-since the slag of these electrodes contain SiO2 and TiO2 oxides .melting of the electrodes has as result intensive interacation of these oxides with CaF2 with formation of gaseous with influence of arc stability.
Could somebody provide more explanation/infos concerning the above subjects?
GIGI ZEGHEANU
EWE - TOTAL E&P
From: pgoswami <pgoswami@quickclic.net>
To: materials-welding@googlegroups.com
Cc: mechsivachidambaram@gmail.com
Sent: Sunday, 29 March 2015, 17:13
Subject: RE: [MW:23010] HOLDING OF ELECTRODES
Mr. Sivachidambaram,
Please see the attached document for your guidance. If these electrodes are
in " hermetically sealed" packs, one may avoid rebaking. There is no
specific time limits for storage @ 150 Deg C, however storing for months
would not be advisable. You need to go with your electrode manufacture's
recommendations.
Thanks.
Pradip Goswami, P.Eng,IWE
Welding & Metallurgical Specialist
Ontario, Canada
pgoswami@quickclic.net
pradip.goswami@gmail.com
http://ca.linkedin.com/pub/pradip-goswami/5/985/299
-----Original Message-----
From: materials-welding@googlegroups.com
[mailto:materials-welding@googlegroups.com] On Behalf Of safad pp
Sent: Sunday, March 29, 2015 2:12 AM
To: materials-welding@googlegroups.com
Subject: Re: [MW:23009] HOLDING OF ELECTRODES
Dear SIvachidambaram,
You can keep it for continuously @ 150
deg . Before that theses electrodes shall be baked @ 250-300 deg for 2
hours .Once should we take care that, the required quantities of electrodes
should be taken for baking ,then long time holding can be avoided . And also
when baked electrodes contact with
room temp for more than 4 hours ,then again re-bake required .
Shafad P.P
CSWIP3.1 /AWS -CWI
On Sun, Mar 29, 2015 at 10:51 AM, Siva Chidambaram
<mechsivachidambaram@gmail.com> wrote:
> Hi Friends,
>
> Can anybody guide me that how long shall i keep Low Hydrogen electrode
> on a Holding oven at a temperature of 150deg Cel.
>
>
> Regards,
> M. SIvachidambaram
>
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