Views: 0 Author: HanTenCNC Publish Time: 2021-10-17 Origin: Site
Laser welding is a process that uses the radiant energy of the laser to achieve effective welding. Its working principle is to excite the laser active medium (such as a mixture of CO2 and other gases, YAG yttrium aluminum garnet crystals, etc.) in a specific way. It oscillates back and forth in the resonant cavity to form a stimulated radiation beam. When the beam contacts the workpiece, its energy is absorbed by the workpiece, and welding can be carried out when the temperature reaches the melting point of the material.
Laser welding can be divided into heat conduction welding and deep penetration welding. The heat of the former diffuses into the workpiece through heat transfer, and only melts on the surface of the weld. The interior of the workpiece is not completely penetrated, and there is basically no vaporization phenomenon. It is mostly used for low-speed thin-walled. Welding of materials; the latter not only completely penetrates the material, but also vaporizes the material to form a large amount of plasma. Due to the large heat, a keyhole phenomenon will appear at the front of the molten pool. Deep penetration welding can completely penetrate the workpiece, and has large input energy and fast welding speed. It is currently the most widely used laser welding mode.
1. The use of laser welding can obtain high-quality joint strength and larger aspect ratio, and the welding speed is relatively fast.
2. Since laser welding does not require a vacuum environment, remote control and automated production can be achieved through lenses and optical fibers.
3. The laser has a large power density, has a good welding effect on difficult-to-weld materials such as titanium, quartz, etc., and can weld materials with different properties.
4. Micro welding is possible. After the laser beam is focused, a small spot can be obtained, and it can be accurately positioned, which can be used in the assembly welding of micro and small workpieces that are automatically produced in large quantities.