Mr. Ahmed,
SS or any SMAW electrodes of 2.0 , 2.5, 3.2 mm size electrodes generally have this eccentric coating problem due to light coating given on the core wire.
You can hold the electrode in the electrode holder burn it and see whether the flux coating burns on one side, i.e., on the thinner side of the coating.
Just reverse the electrode to 180 deg in the holder, burn and and check again whether the flux is over burning on the same side.
If so, then it could be concluded that, the flux coating is eccentric. This is more practical compared to checking though machine.
sridhar.
SS or any SMAW electrodes of 2.0 , 2.5, 3.2 mm size electrodes generally have this eccentric coating problem due to light coating given on the core wire.
You can hold the electrode in the electrode holder burn it and see whether the flux coating burns on one side, i.e., on the thinner side of the coating.
Just reverse the electrode to 180 deg in the holder, burn and and check again whether the flux is over burning on the same side.
If so, then it could be concluded that, the flux coating is eccentric. This is more practical compared to checking though machine.
sridhar.
From: Ryan Carbonara <rcarbonara@valv.com>
To: materials-welding@googlegroups.com
Sent: Friday, 6 July 2012 10:22 PM
Subject: RE: [MW:14784] Tapered burning of MMA electrode
In the old oilfield days for me 15 years ago for SMAW SS overlays the welder would have a scrap piece of plate and would initiate and arc and burn the rod back a 1/4".
The rods would often leave porosity on the initiation of the weld bead.
They would then start the weld bead with a rod that was evenly burned and warm. This would alleviate their porosity issues on the weld overlay.
Ryan
From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Murtaza Ghauri
Sent: Friday, July 06, 2012 4:41 AM
To: materials-welding@googlegroups.com
Subject: Re: [MW:14783] Tapered burning of MMA electrode
Thank you very much for your advice.
I have tried to compare the welding profile for both types of electrodes i.e center out and center ok electrodes but both electrodes give the same profile.
Can it be a problem of magnetic arc blow because I felt my electrodes posses some magnetic response?
I have tried to compare the welding profile for both types of electrodes i.e center out and center ok electrodes but both electrodes give the same profile.
Can it be a problem of magnetic arc blow because I felt my electrodes posses some magnetic response?
From: Shadab Ansari <shadabansarialam@gmail.com>
To: materials-welding@googlegroups.com
Sent: Thursday, July 5, 2012 11:54 AM
Subject: Re: [MW:14768] Tapered burning of MMA electrode
Dear Ahmed,
There seems to be the manufacturing problem.
Please check the concentricity of the electrodes. Such problem occurs when the coating and the core rod are not concentric.
There seems to be the manufacturing problem.
Please check the concentricity of the electrodes. Such problem occurs when the coating and the core rod are not concentric.
Warm regards
Shadab ansari
Shadab ansari
On Jul 5, 2012 9:44 AM, "Materials & Welding" <materials-welding@googlegroups.com> wrote:
-- Dear ExpertsI am Facing a problem in SS 308-16 MMA electrode diameter 2.5 mmwhen I start welding It gives tapered burning of electrodewhat can be the possible reasons from welding point of view and electrode manufacturing point of view???How this problem can be solved?Regards,Ahmed--
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