Method for washing aluminum alloy oxidation film to be welded via laser

Abstract

The invention provides a method for washing an aluminum alloy oxidation film to be welded via laser, relates to an efficient, high-quality, environmentally-friendly and stable washing process and solves the problems such as multiple processes, low efficiency, surface scratch damage, low stability and environmental pollution and the like of the chemical and mechanical washing methods at present. The method comprises the following steps: a position setting step, wherein a laser galvanometer head is capable of emitting a laser beam with nanoscale short pulse, an included angle alpha is formed between an optical axis of the laser beam and a surface to be washed at an intersection point, and alpha is greater than or equal to 30 degrees and less than or equal to 60 degrees; enabling a compressed air nozzle to point at the intersection point, forming an included angle beta between the compressed air nozzle and the surface to be washed, wherein beta is greater than or equal to 10 degrees and less than or equal to 20 degrees; enabling a suction nozzle of a dust sucking system to point at the intersection point, and forming an included angle gamma between the suction nozzle and the surface to be washed; a power setting step of setting average power and washing rate of the laser beam according to the thickness of an oxidization film with the surface to be washed; and a washing step of washing the surface to be washed via laser at the average power and the washing rate.

Description

technical field [0001] The invention relates to laser cleaning and laser welding technology, in particular to a method for laser cleaning of an aluminum alloy oxide film before welding. Background technique [0002] There are different forms of oxide films on the surface of aluminum alloys. At relatively low temperatures, the form of oxides is mostly Bayer body, and its composition is aluminum hydroxide, that is, Al(OH) 3 , can also be written as Al 2 o 3 ·3H 2 O. At a relatively high temperature, boehmite AlO(OH) (also written as Al 2 o 3 ·H 2 O) is an oxide film in the main form. [0003] The thickness of the natural oxide film formed by aluminum alloy in the atmosphere is only 2-30nm. There are two main methods of artificially preparing the oxide film: one is the chemical oxidation method, and the thickness of the oxide film prepared by it is 1-2.5 μm; the other is the anode Oxidation method, the thickness of the oxide film prepared by this method is 2.5-150 μm. ...

AI Technical Summary

Problems solved by technology

[0027] The purpose of the present invention is to provide a method for laser cleaning of aluminum alloy oxide film before welding, provide a high-efficiency, high-quality, environmentally friendly, stable laser cleaning process for aluminum alloy surface oxide film before welding, and solve the current chemical and mechanical cleaning methods. There are problems such as many processes, low efficiency, surface scratch damage, poor stability, and environmental pollution.

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