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The objective of this paper is to investigate the influence of constricted vacuum arcs on the distribution and microstructure of the molten layer of anode surface. A pair of axial magnetic field contacts was set in a vacuum chamber with contact material CuCr25 (25% Cr) and the contacts diameters were 42 mm. The arc modes observation was recorded by a high-speed CCD, and the microstructure of the cross...
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