Laser welding machine is a new type of welding method. The key is to weld thin wall raw materials and high-precision parts. It can complete welding, butt welding, overlap welding, sealing welding, etc. The ratio of depth to width is high, the total width of welding is small, the thermal hazard area is small, the deformation is small, the welding speed is faster, the welding is smooth, beautiful and generous. After welding, there is no need to solve or simply solve the problem. The welding quality is high, there is no air hole, it can be accurately manipulated, and the focus spot is small, High precision, easy to complete automation technology.
What are the laser welding machine main parameters?
1. Power density Power density is one of the important parameters in laser production and processing. With higher power density, the surface can be heated to the melting point in microseconds, resulting in a lot of gasification. Therefore, the high power density is beneficial for the removal of raw materials for production and processing, such as hole drilling, laser cutting and manual carving. For the lower power density, the surface temperature must go through several ms to reach the melting point. Before the surface is gasified, the lowest layer reaches the melting point, which is easy to produce better fusion welding. Therefore, in transmission laser welding, the power density is in the range of 104~106W/cm2.
2. Single pulse mode Single pulse mode is a key problem in welding, especially for sheet welding. When the high toughness beam hits the surface of raw materials, the metal surface will be damaged by the kinetic energy reflecting surface, and the transmissivity will change with the surface temperature. In a single pulse efficacy period, the transmissivity of metal materials changes.
3. Pulse width duty ratio is one of the key parameters of pulse welding, which is different from raw material removal and raw material melting, and is also an important parameter to determine the engineering cost and volume of production equipment.
4. The harm of defocusing amount is very easy to volatilize into piles due to the high power density of the light spot core at the laser focus. The power density is relatively uniform on all plans leaving the laser focus. There are two defocusing methods: positive defocusing and negative Weinan laser cutting machine factory defocusing. The focal plane on the top of the product is positive defocusing, and the opposite is negative defocusing. According to the basic theory of geometrical optics, when the distance between the positive and negative defocusing planes and the welding plan is the same, the power density on the matching plan is similar, but in fact the fusion pattern obtained is different. During negative defocusing, a large melting depth can be obtained, which is related to the whole process of fusion.
