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Static magnetic field-laser coaxial composite fusion covering method and device

A static magnetic field and laser technology, applied in the coating process of metal materials, coatings, etc., can solve the problems that it is difficult to effectively control the solidification and crystallization process of the cladding layer, and the cladding layer is prone to residual inclusions, porosity, and inability to apply to parts at the same time. , to achieve the effect of simple device, low cost and wide application

Active Publication Date: 2014-04-23
HANGZHOU BOHUA LASER TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, laser cladding also has some insurmountable shortcomings: for example, there is often a large residual stress in the cladding layer, which needs to be improved by means of subsequent heat treatment; the surface of the cladding layer is prone to irregular undulations, which affects the surface shape. Defects such as inclusions, pores, and porosity are likely to remain in the cladding layer, which become potential crack sources; for example, it is difficult to effectively control the solidification and crystallization process of the cladding layer only by adjusting the laser process parameters
The magnetic field-laser composite method or device disclosed in the above documents has no static magnetic field used in the research of laser cladding technology, and although some magnetic field generating devices can move synchronously with the laser, they are only suitable for flat plates (belts), rotators and other rules. Shaped parts cannot be applied to shaft, plate, and surface parts at the same time

Method used

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  • Static magnetic field-laser coaxial composite fusion covering method and device
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  • Static magnetic field-laser coaxial composite fusion covering method and device

Examples

Experimental program
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Effect test

Embodiment 1

[0025] like figure 1 , a device for applying a static magnetic field-laser coaxial composite cladding, including a laser generator 2 connected in sequence, a laser transmission channel 1, a magnetic core 4, and a coaxial powder feeder 6, and the magnetic core 4 is equipped with The excitation coil 3 and the gas protection device are connected to the laser transmission channel 1, wherein the excitation coil 3 is coaxially combined with the magnetic core 4, the magnetic core 4 is coaxially combined with the coaxial powder feeder 6, and the coaxial powder feeder 6 is combined with the laser transmission channel coaxial 1 combination (as figure 2 As shown), the laser generator 2 and the laser transmission channel 1 can be connected through a flexible optical fiber or a flying optical path, the cladding substrate 5 is placed on the workbench, and the gas protection device is connected to the laser transmission channel 1.

[0026] Firstly, the surface of the low-carbon alloy steel...

Embodiment 2

[0028] In this example, the static magnetic field in Example 1 (that is, the coil does not flow through) is removed, while other process parameters remain the same. The results of this example show that, under the effect of no static magnetic field, there are only a small amount of columnar crystals growing perpendicular to the interface of the cladding layer near the substrate interface, and the rest of the interface are uniform equiaxed crystals (such as Figure 4 As shown), combined with Example 1 and Example 2, it is proved that the static magnetic field can effectively regulate the grain growth form of the laser cladding layer.

Embodiment 3

[0030] The device for static magnetic field-laser coaxial composite cladding is the same as that of Embodiment 1.

[0031] After grinding the surface of the low-carbon alloy steel to be fused, wash it repeatedly with acetone, then put it in a drying oven and dry it at 100°C for 30 minutes, and place the pretreated sample on the workbench. 1A direct current is passed into the excitation coil to control the mechanical arm, adjust the laser focal length, and adjust the magnetic core at the same time, so that the distance between the magnetic core and the substrate is as close as possible. At this time, the magnetic induction generated on the surface of the substrate under the permeable core is about 200mT. Turn on the laser generator (power 1800W, spot diameter 4mm), gas protection device (argon gas flow rate 4L / h), turn off the powder feeder (powder feeding volume 0), and use the scanning speed of 300mm / min according to the preset The melting track is fused, and the excitation ...

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Abstract

The invention relates to a static magnetic field-laser coaxial composite fusion covering method and a device and belongs to the technical field of laser processing. A static magnetic field is provided by an electromagnet, and the coaxial compositing of the magnetic field and a laser beam is realized through a device. When in magnetic field-laser coaxial fusion covering, the magnetic field generation device moves coaxially and synchronously with the laser beam, the coupling of the magnetic field and a laser-induced molten pool flow field can be completed, the laser fusion covering process is completed through a preset or coaxial powder delivery way, the flowing of the laser-induced molten pool can be inhibited, so that a purpose for controlling the solidification structure, improving the surface shape of the fuse covering layer, optimizing the distribution of the stress and reducing the splashing phenomenon in the fuse covering process can be realized. The coaxial synchronous motion of the magnetic field and the laser can be realized. The static magnetic field-laser coaxial composite fusion covering method and device have the characteristics of good capacity for controlling the fuse covering layer, wide application range, simplicity in structure, convenience in popularization and the like.

Description

technical field [0001] The invention belongs to the technical field of laser processing, and in particular relates to a static magnetic field-laser coaxial composite cladding method and device. Background technique [0002] Laser cladding is a technology that adds cladding materials to the surface of the substrate and uses a high-energy laser beam to fuse it with the surface of the substrate and form a metallurgical bond. Laser cladding is an advanced surface modification technology, and it is also the basis of laser three-dimensional manufacturing and laser additive manufacturing. Therefore, the performance of the laser cladding layer will directly affect the surface performance of the material and the overall performance of the molded part. However, laser cladding also has some insurmountable shortcomings: for example, there is often a large residual stress in the cladding layer, which needs to be improved by means of subsequent heat treatment; the surface of the cladding...

Claims

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Application Information

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IPC IPC(8): C23C24/10
Inventor 姚建华王梁张群莉陈智君
Owner HANGZHOU BOHUA LASER TECH
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