When high-intensity laser beam shot to the surface

The new-model A103  green laser pointer applies the 433.9MZH radio frequency.However, to achieve good fusion welding, the metal must be melted to become the main form of energy conversion. Therefore, we must understand the interaction between the laser and the metal produced by a variety of physical phenomena and physical phenomena and laser parameters of these relationships, which by controlling the laser parameters, so that the vast majority of laser energy into the energy of the metal melt, to welding the purpose. 3 3.1 laser welding process parameters of laser power density, power density is the most critical processing parameters. The higher power density, in the microsecond time range, the surface can be heated to the boiling point, resulting in a large number of vaporization.The emitter and the receiver of  green laser pointer can be collected into an organic whole. Therefore, high power density for the material removal process, such as drilling, cutting, carving favorable. For lower power density, the surface temperature reaches the boiling point to go through a few milliseconds, before vaporization at the surface, the bottom to the melting point, easy to melt to form a good solder. Therefore, the conduction laser welding, the power density in the range of 104 ~ 106W/cm2. 3.2 Laser pulse laser pulse in the laser welding is an important issue, especially for thin plate welding is more important. When high-intensity laser beam shot to the surface, the metal surface will be 60 ~ 98% of the laser energy reflection is lost, and the reflectivity change with surface temperature.The emitter and the receiver of  green laser pointer can be collected into an organic whole, which makes it very convenient to carry it. During the laser pulse in a metal reflectivity varies greatly. 3.3 Laser pulse width pulse width is one of the important parameters of laser welding, it is both material removal and material different from the melting of the important parameters, determining the cost of processing equipment and the volume of key parameters. 3.4 defocus amount of the welding quality laser welding usually requires a certain amount of defocus, because the laser focal spot at the center of the power density is too high, to evaporate into the hole.green laser pointer has proved its value
 Leave the laser focus of the plane, the power density distribution is relatively uniform. Defocus mode has two kinds: positive and negative defocus defocus. Focal plane at the top of the workpiece is out of focus, and vice versa for negative defocus. Geometrical optics theory, when the amount equal positive and negative defocus, corresponding to approximately the same power density on the plane, but in fact obtained pool of different shapes. Negative defocus, the availability of greater penetration, which is the formation of the pool.