green laser pointer can swing up and down or left and right

The relatively large conductivity of metallic materials, light can not penetrate the material, E through = 0; and without any treatment, the reflectivity of the metal surface is close to 1, the absorption rate is almost 0. In order to improve the light absorption rate of the metal surface, laser quenching prior to pretreatment, such as phosphating, and coating absorption layer. Solid metal light absorption wavelength of incident light, material properties, temperature, surface conditions, polarized light and so relevant. The absorption rate of A decreases with the incident wave length increase, the longer the wavelength, the smaller the absorption rate; Similarly, the greater the conductivity of the metal, the lower the absorption rate, other things being equal, the absorption rate of the different metal surfaces. Table 4-1 shows the relationship between absorption rate and the wavelength of incident light part of the metal material with a smooth surface. Then, the bright green laser beam of the laser light of  green laser pointer might appear.
Strengthening mechanism of laser hardening of the material. Previously discussed, researchers generally agree with the laser hardening material strengthening mechanism: (1) grain fine martensite; ⑦ hardened layer of the dislocation density is high; ③ surface to form a compressive stress. The strengthening mechanism is the most essential reason lies in the laser hardening thermal cycling process. The mechanism of the high material properties: the quenching process in acute thermal quenching process, and promote the fine martensite, the high dislocation density, the high lattice defects and surface stress formation, thereby increasing the hardness, wear resistance and anti fatigue performance. Laser hardening process. The pretreatment of the workpiece. The laser hardening is mainly used for processing the workpiece or sample of the iron-based materials, previously described in the metal surface of the laser. The laser beam of  green laser pointer can swing up and down or left and right.
after welding the joints brittle type of silicon steel sheet using 1kW CO2 laser welding welding, the maximum welding speed of up to 10 m / min, and post-weld joint performance has been greatly improved. Pulsed laser welding has been successfully used for welding stainless steel, iron, nickel alloys, platinum, key, platinum, copper and various types of steel alloys and so on. The laser pulse welding practical application of the success stories of the CRT electron gun assembly. The electron gun is composed by dozens of small and thin parts. The electron gun assembly method is used for resistance welding. Resistance welding, the parts under pressure distortion, so the decline in accuracy, and because of the increasing miniaturization of electron gun dimensions, welding equipment, design and manufacture of more and more difficult. The emitter of green laser pointer  has the exclusive address code when it comes out of the factory.