Dear Jignesh,
The possible reasons are:
1) Manufacturing defect i.e the flux coating and the core wire are not concentric that leads to excess coating at once side
2) The core wire is not straightened properly in the manufacturing process.
3) Influence of magnetic flux in the welding area which gives arc blow that gives a feeling of one-side burning.
Regards,
Shankar Narayan
From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Jignesh Desai
Sent: Wednesday, December 29, 2010 8:33 PM
To: materials-welding@googlegroups.com
Subject: [MW:8989] E -7018 (TAPPER BURNING)
Can anybody write some technical reasons behind tapper burning of subject electrodes with high fluctuations of current and wastage of excessive stub length because of red hot (@ 30%)?
Also with above, what could be the possible defects in the weld joints?
Regds/Jignesh
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