Nozzle for laser cladding

Abstract

The invention discloses a nozzle for laser cladding. The nozzle is provided with a central channel which is arranged at the center of the nozzle and is penetrating from top to bottom; the bottom of the central channel is in the shape of a funnel; a plurality of powder channels and a plurality of gas channels are arranged between the wall of the central channel and the outer wall of the nozzle, wherein one end of each powder channel is connected with a powder adding apparatus, the one end of each powder channel penetrates the bottom surface of the nozzle, one end of each gas channel is connected with a protective gas adding apparatus, the one end of each gas channel penetrates the bottom surface of the nozzle, and the powder channels and the gas channels are spiral and are alternately arranged and uniformly distributed around the central axis of the central channel. According to the nozzle for laser cladding provided by the invention, original linear powder channels and gas channels are designed to be spiral, so distance from a minimum convergent point of a powder flow field formed by gathering of powder flows and gas flows to the bottom end of the nozzle is shortened, and density uniformity of alloy powder in the powder flow field is improved by more than 30% compared with the density uniformity obtained by using a last-generation nozzle.

Description

technical field [0001] The invention relates to a nozzle for laser cladding, belonging to the field of laser cladding. Background technique [0002] Laser cladding is high-energy laser surface cladding. Its physical process is that under the irradiation of high-energy laser beams, the surface of the substrate is rapidly melted, and the liquid metal forms a small-scale molten pool. In this molten pool, the original metal The material is mixed with the added powder to form a new liquid metal layer. After the laser beam passes through, the temperature of the molten pool decreases, the liquid metal cools rapidly, and a new solid cladding layer is formed on the metal surface. Laser cladding can greatly change the metal properties of this key part, such as hardness, wear resistance, heat resistance, corrosion resistance, etc. [0003] The main powder feeding technology in today's industry in laser cladding applications is side-axis powder spraying. However, since side-axis powder...

AI Technical Summary

Problems solved by technology

Powder channel 3 and gas channel 4 in the prior art are as attached figure 1 All shown in the figure are straight channels, which are uniformly distributed around the central axis of laser channel 2. Due to the limitation of the size of the nozzle, the inclination angle of the straight channel is limited, so the distance from the minimum convergence point of the powder flow and gas flow to the bottom of the nozzle is relatively long. , the density of the powder flow field after mixing the powder and the protective gas is small and uneven, which affects the cladding effect, and a series of cladding results such as the tension of the laser molten pool, the melting ratio, and the cladding height are difficult to control

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