Laser cladding generally has a higher hardness than conventional quenching hardness. Laser heating has a very high power density, that is, the laser irradiation area has extremely high power per unit area. Due to the extremely high power density, the conductive heat dissipation of the workpiece cannot transfer heat immediately. As a result, the area of the workpiece irradiated by the laser quickly heats up to the austenitizing temperature. Does the new ultra-high-speed laser cladding technology achieve rapid heating? If the laser heating is completed, the large capacity of the workpiece matrix will still maintain a low temperature during rapid heating. Therefore, the heated area will be quickly cooled due to the heat conduction of the workpiece itself, which can achieve heat treatment effects such as quenching. Laser heat treatment has a high degree of automation, and the depth of the solidified layer and the solidified area are controllable. This invention mainly enhances the surface of automobile parts or molds to improve their surface hardness, wear resistance, corrosion resistance, strength, and high-temperature performance, etc., for example, automobile engines The laser additive manufacturing technology of cylinder bores, crankshafts, ultra-high-speed laser cladding powder stamping molds and casting templates can complete the forming and production of complex parts without molds, and can also deposit parts with special properties in selected areas of the parts. Strengthen the coating, thereby growing parts of specific shapes, and laser-reproduce defective parts. In addition to resizing, you can also improve the performance of your components. New. In addition, the development of high-energy beam heat treatment technology has provided technical support for the completion of surface heat treatment of partial areas of our important parts and has become an important heat treatment.

Laser cladding is used in machinery and equipment industries such as stone mining, chemical industry, metallurgy, electric power, cement, etc. With the long-term use and aging of equipment, such as gas turbine rotor journals and blades, roll journals, steel mill archways, etc., laser cladding has emerged Partially damaged and in need of repair. In laser cladding technology, the failure modes of these large components mainly include fragmentation and cracking of internal metal parts, severe wear or corrosion to local spalling, etc. These parts have withstood the test of high temperature and high pressure of gas to varying degrees, and have withstood the effects of corrosive media for a long time, as well as the mechanical stress caused by volume loads. It can be found that most of the damage occurs on the surface or starts from the surface, so it is necessary to improve the parts Surface properties play an important role in extending the service life of parts. At the same time, surface-damaged areas discovered in time through periodic maintenance can also be remedied through surface remanufacturing technology. For gas turbines and steam turbines, failure often occurs in hot-end components such as rotors, blades, and nozzles. The breakage that occurs at the root of the blade is irreparable, while the damage that occurs at the top surface or root of the blade can be repaired and reused. Furthermore, the blades used in generator sets are often very expensive. Reinstalling and reusing the repaired blades will greatly reduce the power generation cost of the power plant. Whether laser cladding is used to strengthen the surface of parts before service or to repair failures after service, its traditional processing methods mainly include surface quenching, surface carburizing or nitriding, thermal spraying, surfacing, etc. With the continuous upgrading and improvement of processing technology, laser mobile remanufacturing technology (laser cladding) has gradually become widely used. This laser remanufacturing technology can not only be used to repair damaged parts but also can be used for laser surface quenching. Compared with traditional heat treatment methods, laser quenching is a fast heating and cooling processing technology that can obtain crystals on the surface. Finely grained hardened layer. Moreover, combined with high-end multi-axis machine tools or 6+2 manipulators, lasers can also be used to repair damaged three-dimensional complex parts, which fully reflects the flexibility and advancement of laser remanufacturing technology.

What are the advantages of laser cladding?

I don’t know if we know it. In most cases, many things have some commonalities. For this reason, the advantages of laser cladding can be cleverly and flexibly used. I think many people should be aware of such matters. So about laser cladding, The advantages can be briefly discussed for us. The concentrated power density of the laser beam can reach 1010~12W/cm2, and it can achieve a cooling rate of up to 1012K/s when acting on materials. This comprehensive characteristic not only provides a strong foundation for the development of new disciplines in material science but also provides a basis for new types of materials. The realization of materials or new functional surfaces provides an unprecedented tool. The melt created by laser cladding is far away from the equilibrium state of rapid cooling conditions under high-temperature gradients, causing the formation of a large number of supersaturated solid solutions, metastable phases, and even new phases in the solidification structure. This has been confirmed by a large number of studies. It provides new thermodynamic and kinetic conditions for the production of functionally graded in-situ autogenous particle-reinforced composite layers. At the same time, the preparation of new materials by laser cladding technology is an important basis for the repair and remanufacturing of failed parts under extreme conditions and the direct manufacturing of metal parts. It has received great attention and multi-faceted research from the scientific community and enterprises around the world. At present, laser cladding technology can be used to prepare iron-based, nickel-based, cobalt-based, aluminum-based, titanium-based, magnesium-based, and other metal-based composite materials. Classified by function: coatings with multiple functions can be prepared singly or simultaneously, such as: wear resistance, corrosion resistance, high temperature resistance, etc., as well as special functional coatings. From the perspective of the data system that constitutes the coating, it has developed from a binary alloy system to a multi-element system. The alloy composition design and versatility of multi-element systems are important development directions for the preparation of new materials by laser cladding in the future. The above are the advantages of laser cladding. New research shows that steel-based metal materials dominate my country’s engineering applications. At the same time, the failure of metal materials (such as corrosion, wear, fatigue, etc.) mostly occurs on the working surface of parts, and the surface needs to be strengthened.