Apr 17, 2019
Many manufacturers always encounter some problems in the process of using fully automatic laser welding machines. Laser welding machines are no stranger to the laser processing industry, but we need to learn more about the automatic laser welding machine. The efficiency of laser welding processing will be improved to some extent. Generally speaking, there are four aspects:
1. Power Density Power density is one of the most critical parameters in laser welding processing technology. With a higher power density, the surface layer can be heated to the boiling point in the microsecond time range, resulting in a large amount of vaporization. Therefore, high power density is advantageous for material removal processing such as punching, cutting, and engraving. For lower power densities, it takes several milliseconds for the surface temperature to reach the boiling point. Before the surface layer vaporizes, the bottom layer reaches the melting point, which tends to form a good fusion weld.
2. The waveform of the laser pulse on the laser pulse waveform, has always been an important issue in laser welding technology, especially in the thin-film welding is even more important. When a high-intensity laser beam is incident on the surface of the material, the metal surface will be reflected by 60%--98% of the laser energy, and the reflectance varies with the surface temperature. During a laser pulse action, the metal reflectivity changes greatly.
3. The width of the laser pulse The so-called pulse width is also an important parameter in the pulse laser welding technology. It is an important parameter that is different from material removal and material melting, and is also a key parameter that determines the cost and volume of the processing equipment.
4. The impact of the amount of defocus on the quality of welding. Laser welding machine friends should know that general laser welding usually requires a certain degree of defocus, because the power density of the center of the spot at the laser focus is too high, so it is easy to cause evaporation hole. The power density distribution is relatively uniform across the planes exiting the laser focus.