How to weld > Magnetic arc blow
Welding with multiple arcs
Multiple electrodes normally lead to increased welding productivity in comparison to welding with a single electrode.
Welding with multiple arcs using D.C., where there is only a small distance between the electrodes, may cause arc blow. This since the magnetic field from each electrode can influence the performance of the adjacent arc.
If arc blow is encountered, equal polarity between the electrodes supports inward arc deflection and unequal polarity supports outward arc deflection, according to the illustration below.
Arc deflections during welding with two electrodes.
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