Laser welding is mainly a method of using a high-energy-density laser beam as a heat source to achieve the welding effect. Usually, a continuous or pulsed laser beam can be used to achieve the welding process, and in order to achieve a good welding process, it is usually used for laser welding. Certain process parameter requirements. So, what are the main process parameters for laser welding with high quality and quantity?
First, the power density. Power density is one of the most critical parameters for laser welding. If higher power density is used, the surface layer can be heated to the boiling point and a large amount of vaporization can be generated in the microsecond time range, which can facilitate the punching and engraving of the processed material. And processing and welding operations such as cutting.
Second, the laser pulse waveform. The laser pulse waveform is an important problem that affects the laser welding process of the sheet processing material. For example, when a high-intensity laser beam is incident on the surface of the material to be welded, the metal surface will lose most of the laser power reflection loss and The reflectance varies with the surface temperature, so pay attention to the degree of change of the laser pulse waveform to the metal reflectivity when performing laser welding.
Third, the laser pulse width. Laser pulse width is an important parameter for distinguishing material removal and material melting in laser welding processing, and is also a key parameter that determines the cost and volume of processing equipment.
Fourth, the amount of defocus. Defocusing is usually a process parameter that has an effect on the quality of laser welding. In order to prevent evaporation of the hole due to excessive power density at the center of the spot at the laser focus, people should pay attention to the need for certain defocusing when performing laser welding. The amount is OK.
The above content is the main process parameters of laser welding processing. In addition to the above four-point laser welding processing parameters, the laser welding processing plant also points out that the welding speed should also be paid attention to during the laser welding operation, thus preventing the welding speed from appearing too fast. If the heat input is too small, the workpiece will not be welded properly.
