In recent years, with the rapid improvement of China's scientific and technological strength, especially the rapid development of the automobile industry, the demand and quality of aluminum alloy welded structural parts are getting higher and higher. At the same time, the research on aluminum alloy welding in related industries is also becoming more in-depth. In particular, the development of laser welding technology has brought new imagination to related industries.
Physical and chemical properties of aluminum alloys
First of all, it is necessary to know that the material has good high reflectivity and thermal conductivity, and has a large number of high density free electrons in the micro-electronic structure. Therefore, under the action of laser, there will be strong vibration and secondary on-demand phenomenon, and then there will be strong reflected waves and weak transmitted waves. Due to the strong immobility of electrons, their thermal conductivity is significantly improved. In addition, a large number of laser welding of aluminum alloy materials shows that chemical corrosion prevention and sandblasting on the surface can effectively improve the laser absorption of the workpiece. Reasonable design of welding gap can effectively improve the energy absorption of its surface.
The effect of plasma on welding
Because the aluminum alloy laser welding process will have different degrees of effect on the surface, its role is to effectively improve the absorption efficiency of the material to the laser, but also in the welding process to obtain more energy. Considering that aluminum alloy is a rare metal containing magnesium, zinc, lithium, and its low boiling point and easy evaporation characteristics. Therefore, it is necessary to make full use of the cooling effect of the plasma itself, in order to reduce the damage caused by the laser welding process, but also to a certain extent, hinder the existence of the keyhole, effectively ensure the quality of the entire welding.