Main types of laser welding machines
Laser welding machines are often referred to as laser welding machines, energy negative feedback laser welding machines, laser welding machines, laser welding machines, laser cold welding machines, laser argon welding machines, laser welding equipment, and the like. According to its working mode, it can be divided into laser mold welding machine (manual laser welding equipment), automatic laser welding machine, jewelry laser welding machine, laser spot welding machine, fiber transmission laser welding machine, galvanometer welding machine, hand-held welding machine. Etc., special laser welding equipment has sensor welding machine, silicon steel sheet laser welding equipment, keyboard laser welding equipment.
Solderable graphics are: points, lines, circles, squares, or any flat pattern drawn by AUTOCAD software.
Laser welding machine parameters
Power density is one of the most critical parameters in laser processing. 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. Therefore, in conduction laser welding, the power density is in the range of 104 to 106 W/cm2.
Pulse waveforms are an important issue in soldering, especially for thin-film soldering. When a high-intensity beam is incident on the surface of the material, the energy on the metal surface is reflected and lost, and the reflectance varies with the surface temperature. The metal reflectance changes greatly during a pulse period.
Pulse width is one of the important parameters of pulse welding. It is an important parameter that is different from material removal and material melting. It is also a key parameter that determines the cost and volume of processing equipment.
Effect of defocus
Because the power density at the center of the spot at the laser focus is too high, it is easy to evaporate into holes. The power density distribution is relatively uniform across the planes exiting the laser focus. There are two ways of defocusing: positive defocusing and negative defocusing. The focal plane is located above the workpiece for positive defocusing, and vice versa for negative defocus. According to the theory of geometric optics, when the distance between the positive and negative defocus planes and the welding plane are equal, the power density on the corresponding plane is approximately the same, but the shape of the molten pool obtained is actually different. In the case of negative defocusing, a greater penetration can be obtained, which is related to the formation of the molten pool.