Laser transmission welding method of transparent thin glass

Abstract

The invention provides a laser transmission welding method of transparent thin glass. The method comprises the following steps of cleaning upper glass and lower glass to be welded, lapping the treated upper glass and the lower glass, putting on a base, putting light-transmission glass on the upper glass, applying a uniform clamping force on the light-transmission glass, allowing an ultraviolet wavelength laser beam and an infrared wavelength laser beam to pass through a collimation focusing system, focusing the ultraviolet wavelength laser beam at a lap joint for preheating, using the infrared wavelength laser beam to assist the ultraviolet wavelength laser beam in welding after the preheating is finished, shutting down an infrared wavelength laser after the welding is finished, and continuing using the ultraviolet wavelength laser beam for postwelding slow cooling of the welded lap joint. The method achieves the weld preheating and the postwelding slow cooling of a workpiece, can effectively reduce residual stress of the workpiece, limits processing cost even improves welding efficiency and welding quality.

Description

technical field [0001] The invention relates to the technical field of laser transmission welding, in particular to a method for laser transmission welding of transparent thin glass. Background technique [0002] Glass materials have the advantages of corrosion resistance, high temperature resistance, non-conductivity, and oxidation resistance. At present, they are widely used in electrical and electronics, micro-electromechanical systems (MEMS), and aerospace and other fields that require high structural strength. At present, there are many methods to realize the connection between transparent glasses, including adhesive bonding, anodic bonding, solid phase bonding, fusion micro-welding, etc. Although the adhesive can connect different materials, the adhesive releases gas and photobleaching leads to premature aging, which may cause contamination of the surrounding devices; the shortcoming of anodic bonding is that the thermal expansion coefficients of the two bonding materi...

AI Technical Summary

Problems solved by technology

In the traditional laser welding process of transparent glass, continuous or long pulse laser is used, which has great defects due to the need to add solder or coating. For example, the patent No. CN105003506A proposes a low-temperature laser micro-welding structure of transparent materials and Its welding method, in this method, a sol-gel that can be condensed after laser irradiation is set as a welding layer between the first connecting piece and the second connecting piece, and the two connecting pieces can be welded after laser irradiation, but the method prepares sol-gel The raw material cost of the gel is high and the preparation cycle is long, and the presence of a large number of micropores in the gel often leads to a decline in welding quality

The patent applications with patent numbers CN102909474A and CN103011571A respectively propose a method for laser welding transparent materials and a method for welding display panel glass. These two methods synchronize ultrashort pulse laser and long pulse laser The combined beam is focused on the interface of two transparent materials to be welded through the objective lens, and the ultrashort pulse laser is used to generate free electrons in the center of the focus to absorb the long pulse laser. When the energy of the long pulse absorbed by the free electrons reaches the melting threshold of the material to be welded, the focus The materials near the center are melted and fused together to realize welding, but this method has the following disadvantages: (1) It is impossible to realize preheating before welding and slow cooling after welding for transparent glass to be welded; (2) It does not have the temperature and weld quality Feedback closed-loop control is not easy to achieve automatic production requirements; (3) The welding efficiency is low and the cost is high

The low frequency of infrared rays leads to poor absorption of infrared rays by transparent glass, and the preheating effect cannot be achieved, while the heating efficiency of halogen lamps is too low, and the preheating area and temperature are not easy to control

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