Publish Time: 2021-07-31 Origin: Site
The laser welding machine is the machine used for processing laser materials. According to the working model of laser welding machine, it can be divided into laser mold welding machine, automatic laser welding machine, laser spot welding machine, and optical fiber transmission laser welding machine. Laser welding is to use a high-energy laser pulse to heat the material locally in a small area. The energy radiated by the laser is transmitted to the material through heat conduction, and the material is melted to form a specific molten pool to achieve the purpose of welding. What are the specifications of the laser welding machine? Here are some answers.
Here is the content list:
Power density
Folded pulse waveform
Folded pulse width
The effect of folding defocus
Power density is one of the most important parameters in laser machining. With higher power density, the surface can be heated to the boiling point in a microsecond time to produce mass vaporization in the laser welder. Therefore, high power density is beneficial for material removal processes such as drilling, cutting, and engraving. For lower power densities, it takes a few milliseconds for the surface temperature to reach the boiling point. Before the surface vaporization, the bottom layer reaches the melting point, easily forming a good fusion welding. Therefore, in conductive laser welding, the power density is in the range of 104~106W/cm2.
The pulse waveform is an important problem in welding, especially for thin sheet welding. When the high-intensity beam is emitted to the surface of the material the energy on the metal surface will be reflected and lost, and the reflectivity changes with the surface temperature. The reflectivity of the metal varies greatly during the course of a pulse.
Pulse width is one of the important parameters of pulse welding. It is not only an important parameter different from material removal and material melting, but also a key parameter to determine the cost and volume of processing equipment.
Due to the high power density at the spot focus of the laser welding machine, it is easy to evaporate into holes. In each plane away from the laser focus, the power density distribution is relatively uniform. There are two ways of defocusing: positive defocusing and negative defocusing. If the focal plane is located above the workpiece, it is positive defocus; otherwise, it is negative defocus. According to geometric optics theory, when the distance between the positive and negative defocus plane and the welding plane is equal, the power density on the corresponding plane is approximately the same. But the shape of the molten pool is different. In the case of negative defocusing, a larger melting depth can be obtained, which is related to the formation process of the molten pool.
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