How to weld > Magnetic arc blow
Selection of welding parameters
Arc blow encountered when using multiple electrodes can be counteracted by feeding one or more electrodes with A.C. In this case, the electrode with A.C. continuously changes the direction of its magnetic field. This measure counteract arc blow, according to the illustration below.
Welding performances with two electrodes using a 0combination of D.C. and A.C.
A beneficial technique to use during multiple arc welding is to combine the positive aspects from both A.C. and D.C. welding. The first electrode is fed by a D.C. current with positive polarity in order to attain a deeper penetration profile. The other electrode/electrodes are supported by A.C. When applying two electrodes connected to A.C., the current phase shift between them can be set to approximately 90° for a high resistance to arc blow.
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