Double-electric-arc spraying device

Abstract

The invention provides a double-electric-arc spraying device which comprises a first constant voltage source, a second constant voltage source and a three-wire spray gun structure. The two sets of the constant voltage sources are connected in parallel. When the positive output end of the first constant voltage source is connected with the A joint of the three-wire spray gun, the positive output end of the second constant voltage source is connected with the C joint of the three-wire spray gun and the negative output ends of the constant voltage sources are both connected with the B joint of the three-wire spray gun, electric arcs can continuously burns between the A joint and the B joint of the three-wire spray gun and between the B joint and the C joint of the three-wire spray gun; when the negative output end of the first constant voltage source is connected with the A joint, the negative output end of the second constant voltage source is connected with the C joint and the positive output ends of the constant voltage sources are both connected with the B joint, the electric arcs can continuously burns between the A joint and the B joint of the three-wire spray gun and between the B joint and the C joint of the three-wire spray gun. According to the invention, two electric arcs are generated by three current contact nozzles, and equivalently, a single conventional electric arc is divided into two electric arcs, so that the temperature and the power of each electric arc are reduced, the heat input is reduced, oxidation and corrosion can be reduced and high production efficiency is achieved.

Description

technical field [0001] The invention belongs to the technical field of thermal processing, in particular to a double-arc arc spraying device. Background technique [0002] Arc spraying is to use two sprayed metal wires as consumable electrodes, use the arc generated by the short circuit of the ends of the two metal wires to melt the wire, and use compressed gas to atomize the molten metal into micro-droplets, and make it Acceleration, a process of depositing a coating on the surface of a substrate at a very high speed. Arc spraying consists of four processes: the heat of the arc zone melts the end of the wire, the molten droplets fly in the arc zone, the metal droplets fly in the air, and the molten droplets deposit on the surface of the substrate. [0003] The application of arc spraying technology has achieved remarkable results in all walks of life. It is mainly used for the repair of major workpieces, wear-resistant and anti-corrosion, preparation of decorative coating...

AI Technical Summary

Problems solved by technology

However, in the traditional arc spraying, an arc is generated by two conductive nozzles, the local temperature will be relatively high, and the power and heat will be relatively large. When the spraying distance is too large, the temperature and kinetic energy of the molten particles hitting the surface of the substrate are not enough, and the molten particles cannot be generated. Sufficient deformation, the coating is loose and porous, the quality is poor, and the bonding strength is low; when the spraying distance is too small, the speed and temperature of the melting particles can be guaranteed to be high, but the substrate and coating are severely oxidized and the bonding strength is reduced. And as the degree of oxidation increases, it will even completely lose the adhesion between the substrate and the coating.

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