In general The shifting of the arc in various directions in electric-arc welding due to the magnetic fields at the arc.
OR
A welding arc may be deflected away from the point of welding, which can mean that the weld quality may suffer. Such arc deflection, usually forward or backward of the welding direction, is known as 'arc blow'.
Arc blow tends to occur if the material being welded has residual magnetism at a certain level, particularly when the weld root is being made. This is due to interaction between the directional magnetic field of the welding arc and the directional field of the residual magnetism.
Remedies for Arc Blow - Arc blow can be minimized by keeping the following factors in view:
1. Electrode geometry in non consumable electrode welding (e.g., TIG and carbon arc welding).
2. Changing the position of earth clamp or current return lead and welding away from the earth connection.
3. Avoiding the presence of (or rearranging) magnetic materials around the workpiece and arc.
4. Storing workpieces away from magnetic sources, such as welding power sources.
5. Lowering the arc current.
ETC
Thanks
Regards,
Prakash Verma
Aker Drilling Risers
Aker Solutions
MOBILE - 0047-40466591
DESK- 0047-22945932
Email: Prakash.Verma@akersolutions.com
-----Original Message-----
From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of we1414
Sent: 30. mai 2011 11:26
To: Materials & Welding
Subject: [MW:11206] ARC Blow
Dear experts Hello to all of you as i m new to this group.
my query is about arc blow. pleas explain why it occurs during welding
and how can it be controlled.
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