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Laser Vibration Welding

Le 31 juillet 2017

Free electron laser is called the fourth generation of light source, can provide from far infrared to X-ray band of high-intensity coherent radiation, in physics, chemistry, materials science, life sciences and other fields with unprecedented revolutionary value. The traditional free electron burning laser pointer based on the RF accelerator to produce high-energy electron beam, and then use the periodic arrangement of the magnet composed of the wave device to tweak and modulation of the electron beam, and finally radiation of high-intensity coherent radiation. Either the RF electron accelerator or the electronic amplifiers made of periodic magnets are bulky and expensive. The development of miniaturized, low-cost, new generation of free-electron lasers, including desktop electronic accelerators and ripples, is a major goal ever pursued by the scientific community.

Laser cutting technology has the following advantages: high precision; slit narrow; cutting surface smooth; fast; cutting quality is good; no damage to the workpiece; not affected by the shape of the workpiece; not subject to the hardness of the material being cut; save mold investment; Materials and so on. Laser cutting technology is widely used in metal and non-metallic materials processing, can greatly reduce the processing time, reduce processing costs, improve the quality of the workpiece.

laser pointer

In recent years, the use of two-color red laser pointer field in the air to stimulate the plasma wire to produce strong terahertz radiation method with its high efficiency, has been widespread concern. The microscopic physical mechanism of this method to produce strong terahertz radiation is mainly described by the ionization current model and the nonlinear four-wave mixing model. A large number of previous studies have shown that such terahertz radiation sources are a single-cycle broadband pulse. Such as the realization of the radiation pulse of the parameters (including the radiation angle distribution, carrier envelope phase, pulse energy, etc.) precision control, will be able to fully expand its application space, to play its application value.

Early laser vibration welding used in the automotive industry is a combination of laser technology and lightweight components, which can be used to solve the above-mentioned problems without the need for filler. The traditional laser vibration welding, collimated beam through the uniaxial vibration, through the focus lens focused spot with the welding head with the workpiece relative to the movement, the formation of a certain amplitude, frequency and offset of the weld; 2-axis galvanometer System vibration welding is through the control system to form a vibration weld, the need for higher costs.

Unlike the CO2 laser, the laser power used in the UV laser panel splitting device is slightly lower and the maximum power 15W can be reached, while the CO2 laser is up to 50W or higher. In addition, our UV laser device parameters are easy to tune. When machining thick plates, you can adjust the 5mw laser pointer power to 15W. And when machining flexible materials, you can also reduce the laser power to 1W-3W. When the processing of flexible material or a specific plastic, you can also use the laser scanning, microsecond delay control between each scan to ensure proper cooling of heat affected zone, thus avoiding the one-time energy implementation of huge heat generated in the products above the agglomeration, this heat affected by near control wire protection components.

The technique involves exposing the sample to intense pulses of the green laser pointer, but the photon energy is much lower than the electron energy emitted from the material. There is a very large electric field associated with such a pulse, which will result in an electron passing through the quantum tunnel from the top of the valence band to the bottom of the electron conduction band, thus creating holes in the electron conduction band. Electrons and holes are driven by the electric field to reach high momentum in the opposite direction. The electric field itself is oscillating, and both the electrons and the holes undergo a reverse and aggregation when the field is transformed. At this point, electrons and holes are recombined to emit a photon escape material and for detection. The energy of the photon is equal to the energy gap between the valence band and the conduction band at the recombination point.




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Création : 31 juillet 2017
Mise à jour : 31 juillet 2017
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