Laser cutting machine is a high intensity laser beam radiation to the surface of metal

Laser cutting machine is a high intensity laser beam radiation to the surface of metal, through the interaction of laser and metal melt metal forming welding. In the process of laser interaction with metal, metal melting is only one of the physical phenomena. Sometimes light is not mainly into a metal melt, and in other forms, such as vaporization, plasma formation, etc. However, in order to achieve good fusion welding, must make the metal melting become the main form of energy conversion. For this, must understand the interaction between laser and metal generated by various physical phenomena and the relationship between the physical phenomena and the laser parameters, and by controlling the laser parameters, make the most of laser energy into the energy of the metal melting, achieve the goal of welding. 1, the power density. Power density is one of the key parameters in laser processing. USES the high power density, within the scope of the millisecond time, the surface can be heated to boiling point, produce a large amount of evaporation. Therefore, high power density for material removal process, such as punching, cutting, carving. For low power density, surface temperature reached boiling point need to experience several milliseconds, before the surface evaporation, the underlying reaches melting point, easy to form a good fusion welding. Therefore, in the transmitting laser welding, power density in the range of 104 ~ 106 w/cm2. 2, laser pulse shape. Laser pulse waveform in laser welding is an important problem, especially for chip welding is more important. When high intensity laser beams shoot to the surface of material, the metal surface will be 60 to 98% of the laser energy reflected and lost, and reflectivity changing with surface temperature. During the period of a laser pulse, the reflectivity of metal changed a lot. 3, laser pulse width. Pulse width is one of the important parameters of pulsed laser welding, it is different from the important parameters of the material removal and melting is to determine the key parameters of the cost of processing equipment and volume.