With the rapid development of laser technology, lasers are widely used in welding various materials. Glass, as a transparent and fragile material, cannot be easily absorbed by traditional laser light sources, and the heat-absorbing glass is easily broken during welding due to its large thermal expansion coefficient, so it is not suitable for traditional laser welding.
Principle of laser processing
It is well known that electrons inside atoms can change from one state of motion to another by exchanging energy with the outside world. For each state, the atom has a certain internal energy value. Each internal energy value is called an energy level. The internal energy of the atom is not continuously changing and is divided into different high and low energy levels. Generally, atoms at high energy levels are very unstable, and they always try to return to lower energy levels to move atoms to lower energy levels, and the moving process is called transition. Under the excitation of certain external photon energy, a large number of particles are excited from a low energy level to a high energy level, so that the light of the stimulated radiation transition is generated, and the stimulated radiation is converted by a laser resonator. Amplify so that it can be used as a laser
Generally, there are two main methods for laser welding transparent materials such as glass and plastic. One is to coat opaque pigments at the welding interface or add an intermediate layer to increase the laser absorption rate. The material near the interface absorbs the laser and the temperature increases, and then the material is melted and then solidified to realize the connection of the transparent material. Another method is to use a special welding light source for welding. The high power density laser causes nonlinear absorption between transparent materials to form effective solder joints. More and more scientific researchers and engineers turn their attention to the laser of special light sources. Welding processing applications.
Laser Soldering Machine
As a special processing method, laser welding has the following characteristics and advantages:
(1) It is possible to perform fine machining. The machining accuracy of the workpiece is very high.
(2) Strong adaptability. It can process various materials including high hardness, high melting point, high strength, and brittleness, and soft materials can also be processed through transparent bodies.
(3) The processing quality is good, and the mechanical deformation and thermal deformation are small.
(4) One machine is multi-purpose. Selecting the appropriate processing conditions can complete various processing such as cutting, drilling, welding, surface treatment, etc. on the same machine tool.
(5) High processing efficiency, energy saving and material saving, and high economic benefits.