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Schematic of a dc hollow electrode torch with a magnet insert.
Arc instability suppression mechanism by a magnetic field perpendicular to the anode electrode: (a) as the arc column moves through the magnetic field, eddy current will be generated inside the arc column. The eddy currents will then produce a magnetic field which opposes the applied field, resisting the motion of the arc column. (b) the longitudinal motion of the arc root causes a change in the magnetic flux linkage passing through the arc circuit and this change will generate a retarding force against the arc root motion.
Temporal evolution of the arc voltages measured from the experiments: (a) without and (b) with a magnet insert (, , and ).
Time-resolved arc voltage wave forms showing their arc attaching modes: (a) without and (b) with a magnet insert (, , and ).
FFT spectra of the arc voltages: (a) without and (b) with a magnet insert (, , and ).
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