Method and sprayer for improving laser cladding effect

A technology of laser cladding and nozzle, which is applied in the field of laser cladding, can solve problems such as cladding surface collapse, insufficient surface tension, and uneven cladding layer surface, and achieve the goal of improving compactness, quality, and cladding quality Effect

Active Publication Date: 2014-05-28
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 sprayer for improving laser cladding effect
  • Method and sprayer for improving laser cladding effect

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Effect test

Embodiment 1

[0023] This embodiment provides a method for improving the effect of laser cladding. During laser cladding, helium is injected into one channel of the nozzle as a protective gas, and nitrogen is injected into the other channel of the nozzle as a protective gas at the same time. Helium and nitrogen are sprayed from the nozzle at the same time. The volume of helium accounts for more than 20% of the total volume of helium and nitrogen, and the pressure of helium is lower than that of nitrogen.

[0024] Nitrogen is cheaper, but it only prevents oxidation, and the anti-oxidation function is not as good as helium. Helium is not only resistant to oxidation, but also more inert, which can prevent other reactions of metal powder, but it is expensive.

[0025] The protective performance of helium is stronger than that of nitrogen, but after comparison, it is found that in the mixed gas of nitrogen and helium, if the volume ratio of helium is more than 20%, the protective performa...

Embodiment 2

[0033] 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 As shown, 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, opened in the laser channel 2. One end of the periphery is connected to the powder adding device and the other end runs through the powder channel 3 on the bottom surface of the spray head 1. One end opened on the periphery of the powder channel 3 is connected to another protective gas adding device and the other end passes through the second protective gas on the bottom surface of the spray head 1. channel 5.

[0034] One end of the first protective gas inlet 9 is connected to the helium addition device, and the second protection gas channel 5 is connected to the nitrogen addition ...

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Abstract

The invention discloses a method and a sprayer for improving a laser cladding effect. According to the method, multiple protective gases are used in the laser cladding process, different protective gases have different gas pressure, and the gas pressure of protective gases with low molecular weight is lower than that of protective gases with high molecular weight. The cladding quality can be improved greatly by using different chemical ingredients and the protective gases under different gas pressure and protecting a powder flow field and work environment; multiple protective gas channels are formed inside a sprayer, so that the protective gases with different ingredients under different gas pressure can be used during cladding, the quality of a cladding layer is improved, the phenomena of cracks, shrinkage porosity and shrinkage cavities are reduced, and the compactness of the cladding layer 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 the cl...

Claims

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Application Information

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Patent Type & Authority Patents(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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