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Produce the purifying effect of the reasons: hazardous substances in the steel can exist in two forms - the inclusion or direct solution in the matrix. When these elements to non-metallic inclusions exist in the laser welding will produce the following effects: For a wavelength of 10.6 μm CO2 laser, non-metallic absorption rates far greater than the metal, nonmetal and metal at the same time by the laser irradiation, The non-metal will absorb more laser to rapid temperature rise in gasification. When these elements in solid solution in the metal matrix, due to the low boiling point of these non-metallic elements, high vapor pressure, they will be evaporated from the bath out. The total effect of these two effects is to reduce the harmful elements in the weld. There are some specific and professional requirements towards 5mw blue laser .
The performance of this metal, in particular, the plasticity and toughness, has important benefits. Of course, laser welding purification effect in the premise must be effective to protect the welding area from air pollution. Fourth, the laser welding process parameters (1) power density. The power density is one of the most critical parameters in the laser processing. Higher power density, in the microsecond time range, the surface can be heated to boiling point, resulting in a large number of vaporization. Therefore, high power density for the material removal of machining such as drilling, cutting, carving favorable. Lower power density, the surface temperature reaches the boiling point to go through a few milliseconds, in front of the surface vaporization, the bottom of the melting point, easy to form the molten weld. It means that this kind of 5mw blue laser should be visible in the laser beam.
Defocus amount of welding quality. Laser welding is usually away from the fuss about because of the high power density of the laser focus at the spot center, easily evaporate into the hole. Leaving the laser focus plane, the power density distribution is relatively uniform. Defocused mode in two ways: positive and negative defocus defocus. Focal plane at the top of the of the workpiece being away from the focus, and vice versa for negative defocus. According to the theory of geometrical optics, when positive and negative away from the focal plane with the welding plane equidistant, corresponding to approximately the same power density on the plane, but the weld pool shape actually. Negative defocus, the availability of greater penetration, which is related with the formation of the molten pool. The power of blue laser pointer 5mw is no less than 30mW.
In such steel carbon content below 0.03% Ti, Ni, can significantly improve its resistance to intergranular corrosion. Concentrated nitric acid of high silicon austenitic stainless steel with good corrosion resistance. Austenitic stainless steel with a comprehensive and good overall performance, a wide range of applications in all walks of life. For welding of stainless steel laser welding performance. The thermal conductivity of austenitic stainless steel is only carbon steel 1/3, the absorption rate is slightly higher than carbon steel. Therefore, the melting of austenitic stainless steel deep deep than ordinary carbon steel 5% to 10% of Cr-Ni system, stainless steel, laser welding, the material has a high absorption rate. CO2 laser welding of austenitic stainless steel. The test of 5mw blue laser is with the specific procedure being complied.
The experiments show that the laser heating 50 to 200us material begins to melt, the formation of liquid metal and asked the sub-vaporization, the formation of city-pressure steam, and at very high speed jet, and a dazzling white. At the same time, high concentrations of vapor liquid metal movement to the weld pool edge, the formation of depression in the weld pool center. When negative defocus, the power density of material internal surface area is also high, easy to form a stronger melting, vaporization, so that the light pass deeper into the material. Therefore, in practical applications, when the requirements of the penetration depth larger, the use of negative defocus; when welding thin materials, Harbin Institute of Technology is preferable to being 12 defocus. Austenitic stainless steels, austenitic stainless steel at room temperature. The specific and detailed requirements of 5mw blue laser are as follows.