Because the laser cladding process is a complex physical, chemical and metallurgical processes, but also a particularly sensitive to the crack process, the crack phenomenon and the behavior involved in laser cladding of each of these factors, including substrate, alloy powder, the former set methods, pre-coated thickness, powder feeding rate, laser power, scan rate, spot size and other factors and their mutual influence, proved: rational selection and the best process parameters with the cladding layer is to ensure that an important factor in the quality of . There in the laser cladding single-channel, multi-channel, single, multi and other forms. Thegreen laser pointerhas several optional functions for the customer.
Single-channel single-layer technology is the most basic technology, multi-channel and multi-layer cladding process occurs before a process of tempering and cracks and other problems; take the world through multi-channel and multi-layer stack, width and thickness can be achieved the increase. The microstructure of laser cladding layer characteristics of process parameters on cladding size and organizational impact. In conventional power density (103-l06W/cm2) when the laser cladding, the 0.1-1s can be completed within the time course of the cladding, such a high rate of heating and cooling of the organization making the cladding layer has many features. In general, the laser cladding layer structure is divided into three zones: melting zone, transition zone and heat affected zone, in a different alloy composition and process conditions, there are some differences between the actual shape. Thegreen laser pointerwith memory function will have some new functions.
Energy distribution of laser processing equipment as well as supporting uniformity and stability of the device has not yet reached the level of industrial production applications. Laser cladding process requires high-power laser beam stability, uniform distribution of the energy spot higher. The current management of laser melting of the main problems is the surface of the cladding layer is not flat, large amount of subsequent machining, and the alloy layer and the substrate at the junction prone to cracks and holes and other defects, to the great practical difficulties. At present, the laser processing system of fixed assets and maintenance costs relative to conventional welding and spray coating is more expensive, which makes laser-treated higher product cost, which is not laser cladding process on a large scale in the field one of the main practical application. The price of green laser pointer will change as the market.
In summary, the laser cladding process is a rapid solidification technique, it can produce a state of equilibrium can not be obtained under the excellent organization and performance. Restrictions on the substrate can be used according to design performance coating composition, can be prepared in a low-cost steel high-performance alloy and the substrate surface and the combination of high strength, is the other surface treatment processes can not match, is particularly suitable for oilfield corrosion, friction and wear of working conditions common surface of wearing parts and repair. Although there are still some problems on the application, but with the people of their study of theory and technology tend to improve gradually in-depth and I believe that in the near future will be excavated in the industry and its potential far-reaching impact. This kind of green laser pointer is specifically made for the lecturing.
Laser alloying (Laser Surface Alloying, LSA) is a partial modification of metal surface, a new method, laser surface alloying process is a material modification of the scope. It refers to the high-energy laser beam irradiation, the substrate surface with a thin layer of alloy elements added as needed while rapid melting, mixing, forming a thickness of 10 ~ l000 um layer of surface melting, solidification of molten layer to obtain the cooling rate of up to l05-108 ℃ / s, equivalent to quench hardening technology can achieve the cooling rate, and because the memory in a liquid melt layer diffusion and surface tension effects and other physical phenomena. The student thinksgreen laser pointeris a kind of good gift.
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