Vacuum Glass Laser Welding Forming Research

The vacuum plate glass is transparent, energy-efficient, high-tech, deep-processing glass product. Its manufacturing technology is difficult, which edge performance is a difficulty that has been plagued by scientists. The edge welding of vacuum plate glass is related to thermal stress problems of brittle materials (glass). And brittle materials welding are different from that of metal materials. It is not use normal welding methods welding, because its heat transfer coefficient is small, and its fragile feature. At this stage, we use high-temperature welding to seal the vacuum plate glass. In this method, the glass and solder are put into the high-frequency furnace. Solder and the glass substrate heated more evenly, less thermal stress; however, the production is slow. This article, derived from the project of the National Natural Science Foundation. The Project name is<High-temperature vacuum sealing flat glass in a long time, in which LOW-E film failure mechanism and Impact study of glass surface stress distribution> After high-temperature manufacturing process of the vacuum plate glass are mastered. The conditions of the laser welding technology are understood is presence. The help of the finite element analysis software ANSYS, the molding process of the simulation analysis of the vacuum plate glass which is manufactured by laser welding. The feasibility and inspection of laser welding is carried out by study the microstructure. After all, everything is to resolve the problem of fasting Edge vacuum plate glass can not be carried.The study found that the heat input is an important factor of welding performance of the vacuum plate glass. The smaller the amount of heat input, heat source nature can be controlled more precisely, the amount of thermal expansion of the welding heat affected zone is smaller; the residual stress is smaller, less prone to fragmentation phenomenon caused by the uneven heating. Laser welding with high energy density and fast welding speed, and smaller heat-affected zone, is an ideal welding of brittle materials.In this paper, the changes of the temperature field of the process of laser welding vacuum glass is analog in using finite element software ANSYS. The law of the temperature field changes is fond. After the completion of the load heat source, with the heat source to heat up, the glass substrate temperature increases the speed is very uneven. Part close to the solder, the large temperature changes; the site away from the solder, the temperature does not change; heat along the Z direction of the vertical glass surface, the temperature gradient; and heat to the surrounding dispersed more calories, less heat to the internal transmission. Thermal structure coupled simulation analysis of the impact of temperature gradient on the stress-strain conditions. The state of vacuum insulation in the corners, there is a large deformation; cooling at room temperature, the edge of the deformation is small, the middle part of have the maximum deformation.In this article, fully preheated glass substrate conditions, fully preheat solder conditions; experiment of laser vacuum glass Edge is carried out smoothly. Four sides of the specimen under the strict control of heat input for fast welding, to ensure that the heat evenly on all sides, to improve the ductility and strength of the joints. Under two different laser beam velocity of5mm/s,10mm/s conditions, by analyzing organizational structure of he samples, come to5mm/s speed and laser beam energy density match better than10mm/s speed and laser beam energy density. A good specimen of the weld structure of grain growth situation is able to create successfully, and solder and glass substrate combined with better results obtained from the energy spectrumIn summary, this paper through the use of finite element analysis; temperature fields in the welding process impact the stress-strain process is analyzed correctly. Through the experiment, the different organizational structure and properties of structural shapes corresponding to the welding results are obtained. All of these are:vacuum plate glass can be applied to laser welding technique. Finally, as an integral part of the National Natural Science Foundation project, the subject has a good practical significance...