Performance And Mechanism Of Laser Welding Of Micro-Arc-Oxidation Aluminum Alloy And High-Alumina Ultra Thin Glass

High aluminum ultra-thin glass has many advantages,such as small thickness,high strength,high wear resistance,high scratch resistance and high toughness.And Aluminum Alloy as a light nonferrous metal,with high strength,good ductility,good corrosion resistance and recycling and other advantages.Organic combination of glass and metal,in addition to the excellent performance of a single material,it has excellent air tightness,good insulation,good transmittance and heat insulation.There are many kinds of glass and metal connecting method of dissimilar materials include:matching sealing,anode welding,adhesive,semi solid connection,but the limitations of these methods are the inherent limitations of the application of welding in electronic components.With the development of laser welding technology,laser welding technology can effectively seal glass and metal.At present,the laser welding technology has been applied to the welding of glass and metal,and some achievements have been made.However,most of the research focuses on silicate glass with large thickness.In this paper,the laser high aluminum thin glass and Aluminum Alloy welding are the biggest difficulty is between the two kinds of materials,the thermal expansion coefficient are different,the welding process will be different due to the volume change of stress concentration caused damage to the welding in the weld,so the first thing to Aluminum Alloy surface in preparing a layer of micro-arc oxide film as the buffer absorption layer by micro-arc oxidation method before welding experiment.The effect of discharge time on the thickness of the oxide film was studied,and the surface morphology and composition of the coating with different thickness were observed.Secondly,the laser welding scheme was formulated,and the influence of the thickness of the micro arc oxide film and the laser power,frequency and pulse width on the shear force of the welded parts was studied.Finally,we observed the fracture and weld cross section structure of glass and metal welds,analyzed the elements and phase of weld,and summarized the laser welding mechanism of high aluminum ultra-thin glass and aluminum alloy.The experimental results show that in the process of micro arc oxidation,with the increase of discharge time,increasing the thickness of micro arc oxidation;micro arc oxidation film thickness is 5?m,welding can obtain better shear force,and has excellent welding performance;The micro arc oxide film on the surface of the glass and aluminum alloy can effectively act as the buffer layer.When the thickness of the oxide film reaches 5?m,the performance of the welding part is optimal.The maximum shear force is 44.27N,when the power is 100W,frequency is 10Hz,pulse width is 2.5ms,welding speed is 3mm/s and defocusing amount is 0mm.The mosaic structure of welded parts in weld is the reason for effective welding.Under the action of laser radiation,the glass and aluminum alloy react with each other,forming a new substance is Al₂Si₄O₁₀.