How to weld > Magnetic arc blow
Workpiece connections
Proper placement of the workpiece connection can diminish magnetic arc blow. This technique introduces a magnetic field in the opposite direction to the one causing the arc blow.
The cause is that the current return from welding goes through the workpiece. It thereby causes a magnetic field in its path. This magnetic field supports an arc deflection away from the workpiece connection, according to the illustration below.
The position of the workpiece connection supports an arc deflection in accordance with the illustration.
If back blow of the arc is encountered, it can be counteracted by positioning the workpiece connection away from the direction of welding. If forward arc blow occurs, locate the workpiece connection towards the direction of welding.
The use of more than one workpiece connection might further improve this method.
The effect from the location of the workpiece connection is limited. Consequently, this measure is normally done together with other complimentary measures in order to avoid arc blow.
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