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Method and nozzle improving laser cladding effect

A technology of laser cladding and nozzle, which is applied in the coating process and coating of metal materials, can solve the problems of cladding surface collapse, insufficient surface tension, and uneven cladding layer surface, so as to improve the compactness and quality , Improve the effect of cladding quality

Active Publication Date: 2013-01-30
CHANGZHOU TIANZHENG IND DEV CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the prior art, only nitrogen is usually used as a protective gas. Although it has a certain effect, the surface of the cladding layer is not smooth and full of pores, and due to insufficient surface tension, the cladding surface has a collapse phenomenon.

Method used

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  • Method and nozzle improving laser cladding effect

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Embodiment 2

[0032] The difference between this embodiment and Embodiment 1 is: a nozzle used for the method for improving the effect of laser cladding, as attached figure 2 , it has a laser channel 2 opened in the center of the shower head 1, a first protective gas inlet 9 opened on the shower head 1 connected to a protective gas adding device and connected to the laser channel 2 at the other end, and opened around the laser channel 2 One end is connected with the powder adding device and the other end runs through the powder channel 3 on the bottom surface of the shower head 1, and one end opened on the periphery of the powder channel 3 is connected to another protective gas adding device and the other end runs through the second protective gas channel 5 on the bottom surface of the shower head 1 .

[0033] One end of the first protective gas inlet 9 is connected to the mixed gas adding device, and the second protective gas channel 5 is connected to the high-pressure nitrogen adding...

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Abstract

The invention discloses a method and a nozzle improving a laser cladding effect. According to the method for improving the laser cladding effect, during laser cladding, a mixed gas of helium and nitrogen is delivered into a channel of the nozzle as a protection gas; high-pressure nitrogen is simultaneously delivered into another channel of the nozzle as a protection gas, wherein the gas pressure of the mixed gas is lower than that of the high-pressure nitrogen. According to the technical scheme of the method and the nozzle improving the laser cladding effect, protection gases with no chemical component and different gas pressures are adopted, a powder flow field and a working environment are protected simultaneously, and cladding quality can be greatly improved; multiple protection gas channels are designed in the nozzle, such that multiple protection gases with different components and different gas pressures can be applied in cladding. Therefore, clad layer quality is improved, cracking is reduced, shrinkage loosening is reduced, shrinkage porosity is reduced, and clad layer compactness is improved.

Description

technical field [0001] The invention relates to a method for improving the effect of laser cladding and a nozzle, 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] In order to prevent the oxidation of metal at high temperature, a protective gas channel is designed in t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C24/10
Inventor 张翀昊柳岸敏黄佳欣黄和芳张祖洪
Owner CHANGZHOU TIANZHENG IND DEV CO LTD
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