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In our traditional sense, laser welding of plastics refers to laser penetration welding. The upper plastics should be able to let the laser penetrate, and the lower workpiece should be able to absorb the laser energy. Therefore, the upper plastic parts are generally colored plastic, while the lower plastic is generally black plastic. The biggest problem of plastic laser penetration welding is to weld transparent and transparent materials, such as the welding between PC and PC, which is widely used in medical industry.
Because both the upper and lower plastics are laser penetrable parts and lack of laser absorbing layer, if plastic laser penetration welding technology is to be used, it is necessary to coat the weld with Clear Weld and other absorbents, which can absorb laser energy to melt the weld for welding. However, this process is seldom used by customers in batch production, because laser absorbent will produce additional cost of consumables and increase production costs, and one more spraying process in production will increase additional equipment, consumables and manufacturing risks. In recent years, new laser welding technology for plastics has solved the welding problems of transparent and transparent plastics. This laser welding method of transparent plastics originates from the different penetration and absorption characteristics of plastics for different bands of laser.
When the laser is applied to plastic, if the plastic surface has a high light absorption, such as the material is black. Or at the focus of the laser, most of the laser energy is absorbed by the surface of the material and the plastic is welded. If the material is away from the laser focus, the energy is absorbed by the plastic when the laser passes through. The plastic is hot but not enough to melt the material. Therefore, for laser welding of transparent plastics, we select a laser with a wavelength of about 2000 nm to ensure that transparent plastics such as PC and PMMA can absorb the energy of the laser. We also need to use a very short focal length laser head to focus the beam into a spot. The characteristics of this lens are that the beam diameter of the lens exit is much larger than the focus spot. When the laser passes through the upper workpiece, the energy density is insufficient to melt the upper workpiece due to the large diameter of the beam. The focus of the laser is at the weld, and the plastic is melted to complete the weld due to the sufficient energy density of the focus.
FPC film laser cutting machine features: the world's advanced lasers and core components, good beam quality, high power stability; multi-year process tuning optimization, focus spot quality, cutting effect, high efficiency; equipment with optical marble platform, high speed and high Precision linear motor and vacuum suction system, accurate positioning, high processing stability; manual loading and unloading and automatic loading and unloading two different models, can be customized according to customer needs. FPC cover film laser cutting machine advantages: using nanosecond UV laser, cold light source, laser cutting heat affected zone is as small as 10μm; focusing spot can be as small as 10μm, suitable for micro-cutting drilling of any organic & inorganic materials; CCD visual pre-scanning & Automatic target positioning, maximum processing range 500mm×350mm, XY platform splicing accuracy ≤±5μm; support a variety of visual positioning features, such as cross, solid circle, hollow circle, L-shaped right angle, image feature points, etc.; robot automatic loading and unloading , cutting IC fingerprint identification chip, single particle takes 3 seconds; laser micro-machining system research and development design technology accumulation, stable performance, no consumables.
Laser welding technology is widely used in the automobile manufacturing process, which greatly improves the quality and productivity of automobiles, and lays a solid foundation for the rapid growth of sales and word-of-mouth. As we all know, automobile manufacturing has four major processes: stamping, welding, painting and assembly. Every link is very important and indispensable. The sheet metal parts produced by stamping workshop are numerous in size and size. The big ones are five doors and one cover, roof and bottom plate, and the small ones are hinges and brackets. How can so many independent parts make up a car? It depends on welding, so welding technology largely determines the quality of a car.
As a welding technology which is popular with Chinese consumers, the principle of laser welding is that the laser beam emitted by the laser generator focuses on the surface of the welding wire to heat, melt the welding wire, wet the steel plate on the car body, fill the gap between the steel plate joints, and form a weld to achieve a good connection. The brazing connection between copper wire and steel plate is formed after welding. The brazing layer formed by copper wire and steel plate is the fusion of two different elements after high temperature. Compared with traditional spot welding, this welding method has better welding quality, faster speed and higher strength of welding parts.
The use of laser welding technology not only greatly reduces the consumption of materials, reduces the weight of the car body, but also improves the strength of the body in white. In addition, laser welding has a high welding line speed, which can effectively improve the production speed, which is very good for the automobile manufacturing industry which pursues time efficiency. It is also because of the application of laser technology that the car is greatly improved. Upgraded production capacity and quality, and laid a solid foundation for the growth of sales and word-of-mouth.