Plasma powder overlay welding device for full utilization of alloy powder

Abstract

The invention discloses a plasma powder overlay welding device for full utilization of alloy powder. The device is characterized by comprising a welding gun main body; the welding gun main body comprises a front gun body and a back gun body detachably and fixedly connected, wherein a nozzle is in threaded connection to the front end of the front gun body; a protective cover for covering the nozzleis in threaded connection to the front gun body; the protective cover is spaced from the nozzle to form a spiral protective gas channel; the back gun body is provided with a protective gas inlet; theprotective gas inlet communicates with the spiral protective gas channel; a protective gas outlet is formed in the lower end of the protective cover; a powder inlet hole is formed in the back gun body; and the powder inlet hole communicates with a powder feeding channel. The device further comprises a rotary powder feeding mechanism; the rotary powder feeding mechanism communicates with the powder feeding channel, is positioned in the spiral protective gas channel, and is driven by protective gas to rotate; and the rotary powder feeding mechanism is rotated to peripherally discharge powder toan arc column of the nozzle. The protective gas is adopted to drive the rotary powder feeding mechanism to rotate, so that the alloy powder is peripherally discharged, the powder discharging is uniform, and the blockage is prevented.

Description

Technical field: [0001] The invention relates to the field of plasma powder surfacing welding, in particular to a plasma powder surfacing device for fully utilizing alloy powder. Background technique: [0002] As a method of surface strengthening, powder plasma arc surfacing technology can improve the wear resistance and corrosion resistance of the surface of the part by cladding a layer of alloy powder with special properties on the surface of the part, thereby prolonging its service life. This technology has the advantages of high temperature, low dilution rate and good controllability, and is widely used in aerospace, ships, valves, mining machinery, screw and other industries. [0003] Because the plasma powder surfacing gun needs to melt the metal powder, the metal powder is mostly fed through the powder feeding channels distributed on both sides. The powder feeding holes connected with the powder feeding channels are set on the welding torch, so the powder feeding hole...

AI Technical Summary

Problems solved by technology

[0003] Because the plasma powder surfacing gun needs to melt the metal powder, the metal powder is mostly fed through the powder feeding channels distributed on both sides. The powder feeding holes connected with the powder feeding channels are set on the welding torch, so the powder feeding holes on both sides are designed as Relative to the contact between the powder and the arc column, it is melted and then sprayed on the surface of the cladding workpiece. There is a small amount of powder sprayed to the outside and cannot fully contact with the arc column, and the powder is not used sufficiently; After the powder hole is clogged, the powder feeding rate is reduced, which cannot be detected in time during the automatic operation process, resulting in uneven cladding layer and affecting cladding quality

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