Godsbreadpost
05-22-2008, 02:26 PM
(this welding problem was bounced around before but never really defined, so I thought posting some info on it would help others know how to fix this when they encountered it)
(sourced from "Welding Principles & Applications")
The welding current flowing through a plate or any residual magnetic fields in the plate will result in uneven flux lines. These uneven flux lines can, in turn, cause an arc to move during a weld.. called arc blow.. (and) is more noticeable in corner, at the end of plates, and when the work lead is connected to only one side of a plate. To control arc blow:
- connect the work lead to the end of the weld joint and making the weld in the direction toward the work lead.
- use two work leads, one on each side of the weld
- the best way to eliminate arc blow is to use AC as it does not allow the flux lines to build long enough to bend the arc before the current changes direction.
If it is impossible to move the work connection or to change to AC, a very short arc length can help control arc blow. A small tack weld or a change in the electrode angle can also help control arc blow, or try reclamping.
(sourced from "Welding Principles & Applications")
The welding current flowing through a plate or any residual magnetic fields in the plate will result in uneven flux lines. These uneven flux lines can, in turn, cause an arc to move during a weld.. called arc blow.. (and) is more noticeable in corner, at the end of plates, and when the work lead is connected to only one side of a plate. To control arc blow:
- connect the work lead to the end of the weld joint and making the weld in the direction toward the work lead.
- use two work leads, one on each side of the weld
- the best way to eliminate arc blow is to use AC as it does not allow the flux lines to build long enough to bend the arc before the current changes direction.
If it is impossible to move the work connection or to change to AC, a very short arc length can help control arc blow. A small tack weld or a change in the electrode angle can also help control arc blow, or try reclamping.