In recent years, laser welding machine as a high-quality, high-precision, low-deformation, high-efficiency and high-speed welding equipment, is becoming an important tool for metal materials processing and manufacturing, more and more widely used in automotive manufacturing and other fields. Laser welding irradiates high-strength laser beam to the metal surface. Through the interaction between the laser and the metal, the metal absorbs the laser light and converts it into heat energy. After the metal melts, it cools and crystallizes to form a weld.
This welding method not only has a high degree of automation, a high welding speed, but also can perform any complicated shape of welding more conveniently. Domestic companies currently producing large-scale laser welding machines include Huagong Laser, Han Laser, Ming Lei Laser, and Macro Stone Laser. Especially in the past two years, with the continuous improvement of laser technology, more and more companies have begun to test water. Laser welding and laser cutting and other fields have shown a flourishing development posture for a time. Although compared with the traditional welding methods, the laser welding machine is expensive, one-time investment is large, and the technical requirements are high. At present, the application in the industry in our country is still relatively limited, but the production efficiency is high and easy to achieve automatic control and other notable features. Make it very suitable for large-scale production lines and flexible manufacturing.
Because the laser beam has a small focal spot and high power density, it can be welded with some high-melting, high-strength alloy materials. And because the heat affected zone of laser welding is small, the deformation of the material is small and there is no need for subsequent processing. In the process of use, the laser beam is easy to guide, focus, and achieve transformation in all directions, and laser welding production efficiency, stable and reliable processing quality, good economic and social benefits. Various advantages have led more and more companies to use laser welding machines instead of traditional welding.
Laser welding is not the same as laser marking or cutting. Its biggest feature is customization. Laser marking and laser cutting can produce large-scale and batch products, but welding can hardly do this because each customer's needs are very different, making astronomy laser pointer welding difficult to mass-produce. However, with the advent of Internet and personalized requirements, the growth of small and medium-sized system integrators and automation companies has increased geometrically, and more and more applications for laser welding have been demanded. This situation will change in nature.
Laser marking used to account for more than half of the entire laser processing market. However, from the development data of the laser industry in 2016, the laser cutting machine market began to break out, and cutting applications began to spread. In the current domestic and international exhibitions, it can be clearly seen that more and more laser companies gradually occupy a larger share. After experiencing the rise of laser marking and the rise of laser cutting, it is believed that laser welding will become The next laser flash point.
Laser-welded plastic technology is a technology that melts the plastic contact surface with the heat generated by the laser beam, thereby bonding the thermoplastic sheet, film, or molded part together. So far, people think that laser processing is often the processing of metal, and the processing of polymers like plastics is still less. However, plastics are widely used as parts of industrial products. Plastics are known as a great product of industrial products. Inventions, especially in daily necessities, are even more ubiquitous. Because plastics have obvious thermoplastic properties, once they are easily heated, softened, melted and even burned, they have always been a major problem for laser processing. Thanks to the improvement in laser performance, the absorption rate of lasers by plastics can be made higher, and the cost of lasers is reduced, making laser processing worth considering. In addition, more importantly, the development of plastic laser welding process is the basis for pioneering applications, especially the study of the effects of laser transmission welding on plastic parts at different levels.
At present, many methods used in plastic welding include ultrasonic welding, hot plate welding, vibration friction welding, and laser welding. Laser welding as a non-contact welding technology, compared with other welding methods, has the advantages of non-contact, airtight, watertight, fast and efficient, high precision, beautiful weld appearance, no restriction on product appearance, easy control, and strong adaptability. , will become the future trend of plastic welding. Laser welding is a vibration-free technology, so it is particularly suitable for processing precision electronic components. The equipment manufactured by laser technology includes a mouse, a mobile phone, and a connection device. Automotive electronics products manufactured by laser technology include automatic door locks, keyless entry and exit devices, and sensors. The laser can also weld the plastic film together. It moves along the edge of the film and forms a package structure by bonding. The operation can be completed very quickly.
Laser welding plastic technology is a very specialized bonding technology. When high speed welding is required and precision welding or aseptic condition welding is required, this can give the best advantages of laser welding. This technology was once subject to price factors, but as the price of equipment continues to fall, it has become more competitive in many applications than ultrasonic welding and hot plate welding. The main application fields of laser welding technology are medical, automotive, electronics and packaging.
Advantages of laser welding in the welding of plastic parts include: precision, solidity, tightness and airtightness of the welding, less degradation of the resin during the welding process, and less debris generated. The surface of the product can be tightly connected around the weld seam. Laser welding has no residue, making it more suitable for pharmaceutical products and electronic sensors controlled by the State Food and Drug Administration. Easy to control, it can weld the workpiece with small size or complex structure. Because the laser is easy to control by computer software, and the output of the fiber laser can flexibly reach various fine parts of the parts, laser welding can weld areas that are not easily reached by other welding methods, and weld products with complex shapes and even three-dimensional geometric shapes. Compared with other welding methods, laser welding significantly reduces the vibrational and thermal stresses of the product. This means that the aging of the product or the internal components of the device is slower and can be applied to fragile products. Can weld many different kinds of materials. As a non-contact, fast and beautiful welding method, laser welding will become the development trend of plastic welding in the future. Therefore, some domestic and foreign material manufacturers began to develop materials suitable for laser welding. High-quality laser welding has become an inevitable choice.