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Pre-welding laser cleaning method and device capable of efficiently removing aluminum alloy oxidation film

A technology of laser cleaning and oxide film, which is applied in the direction of cleaning methods and utensils, chemical instruments and methods, etc., can solve the problems of slow cleaning speed, low overlap rate, failure to meet preparation requirements, etc., to improve cleaning quality and facilitate welding , the effect of high surface quality

Inactive Publication Date: 2018-05-15
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the light is not emitted continuously, it is necessary to consider the influence of the spot spacing, that is, the overlap rate, on the cleaning effect during the cleaning process: if the overlap rate is too high, it will easily cause secondary oxidation of the material to be cleaned, but it will not meet the pre-welding preparation requirements; The cleaning rate is too low, the cleaning speed is slow, and the oxide film may not be completely cleaned. The above-mentioned variable factors in laser cleaning are not mentioned in the existing patents.

Method used

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  • Pre-welding laser cleaning method and device capable of efficiently removing aluminum alloy oxidation film
  • Pre-welding laser cleaning method and device capable of efficiently removing aluminum alloy oxidation film
  • Pre-welding laser cleaning method and device capable of efficiently removing aluminum alloy oxidation film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] Select the material 7 to be cleaned to be 6061 aluminum alloy, adopt sulfuric acid anodization in the anodic oxidation method, and coat a layer of film thickness d on the surface of the aluminum alloy 0 = 4μm oxide film 6, oxide film 6 is Al 2 o 3 , place the material 7 to be cleaned on the three-dimensional mobile platform 8, and place the focal length of the focusing lens 5. The direction of the laser beam is adjusted by the scanning galvanometer 4 so that it is parallel to the normal direction of the upper surface of the aluminum alloy of the material 7 to be cleaned.

[0055] According to the thickness of the oxide film 6, the measured laser cleaning threshold power is J 0 =15W, set the laser cleaning power to J through the laser control board 0 , take △J=0, from η=△J×10 -7 Calculated η = 0, due to D = 50μm, f = 100kHz, according to Set the scanning speed ν=5000mm / s.

[0056] like figure 2 As shown, the pulsed laser 3 emits a pulsed laser and scans the uppe...

Embodiment 2

[0059] The above process of preparing the material 7 to be cleaned remains unchanged, and the material 7 to be cleaned is still selected from 6061 aluminum alloy, and the thickness of the film layer is d 0 = 4 μm. The laser energy J=15W, 20W, and 25W are set to act on the aluminum alloy surface through the laser control board 2, f=100kHz, η=-5%, because D=50μm, according to Therefore, the scanning speed ν=4750mm / s.

[0060] After cleaning, use such as Image 6 The schematic diagram of the oxygen content test on the surface of the aluminum alloy with different laser energies of η=-5% is shown, point A is the center of the laser spot, point B is the center of the adjacent spot, and the test direction is from point A to point B. The result is as Figure 7 The oxygen content curves on the surface of the aluminum alloy with different laser energies of η=-5% are shown. It can be seen from the figure that when J=15W, the oxygen content is higher than that on both sides at the ove...

Embodiment 3

[0062] The material is the same as the previous two examples. Set the laser energy J=25W to act on the aluminum alloy surface through the laser control board 2, f=100kHz, take △J=50×10 4 W / cm 2 , by η=△J×10 -7 Calculated η = 5%, since D = 50μm, according to Therefore, the scanning speed ν=5250mm / s. like Figure 8 Shown is the surface microtopography of the η=5% laser cleaning oxide film according to the present invention. From the figure, it is found that the oxygen content of the laser active area is 0, indicating that the oxide film has been completely removed, and no new oxide layer has been formed; the oxygen content of the unaffected areas of the two adjacent laser spots is also 0, indicating that the oxide film has also been removed. Meet the pre-weld preparation requirements.

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Abstract

The invention provides a pre-welding laser cleaning method and device capable of efficiently removing an aluminum alloy oxidation film. The method includes the steps that S1, a material to be cleanedis prepared, and the oxidation film with the film layer thickness being d0 is arranged on the surface of the material to be cleaned; S2, the material to be cleaned is put onto a three-dimensional moving platform and further located on the focal plane of a focusing lens; S3, the laser beam direction is adjusted to be parallel to the normal direction of the surface of the material to be cleaned; S4,laser parameters are set, laser energy is set and the laser overlap rate is determined; and S5, laser cleaning of the material to be cleaned is conducted, a pulsed laser device emits pulsed lasers toscan the surface of the material to be cleaned, light beams emitted by the laser device pass through the focusing lens and then are absorbed by the oxidation film on the surface of the material to becleaned, matter of the oxidation film is converted into rapid expansion plasmas and is made away from the surface to be removed, and meanwhile shock waves are generated and can turn the oxidation film into fragments to be removed. The aluminum alloy oxidation film can be removed efficiently and effectively.

Description

technical field [0001] The invention belongs to the technical field of laser processing, in particular to a laser cleaning method and device for efficiently removing an aluminum alloy oxide film before welding. Background technique [0002] Laser cleaning technology is a new and efficient green cleaning method. There are a large number of cleaning industries in our country, and the demand for cleaning is also increasing day by day. The traditional cleaning industry mostly uses chemical reagents or mechanical methods to clean materials. With the strengthening of national environmental protection law enforcement, the disadvantages of the above cleaning methods are gradually exposed, and the advantages of laser cleaning, such as less pollution and low material damage rate, are incomparable to the above two methods. [0003] At present, laser cleaning technology has gradually played an important role in the preparation stage of aluminum alloy welding. Among the existing publi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B08B7/00
CPCB08B7/00B08B7/0042
Inventor 佟艳群黄建宇任旭东周建忠叶云霞张昂李琳王超
Owner JIANGSU UNIV
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