At present, the corrosion-resistant and wear-resistant coatings of industrial parts are mainly repaired by hard chromium electroplating technology, thermal spraying, or other surfacing technology, but these technologies have their own limitations, so that the repaired parts have different defects. However, as a new surface modification technology, Laser cladding equipment uses a high-energy laser beam as a heat source to cladding powder materials on the surface of parts to prepare high-performance protective coatings, thereby improving the surface hardness, wear resistance, corrosion resistance, oxidation resistance, high temperature resistance and other properties of the material. Compared with other metal repair processes, the metal additive manufacturing processes has significant advantages.
Laser Cladding System VS Hard Chromium Plating
Hard chromium electroplating is currently one of the most commonly used techniques for the preparation of corrosion-resistant and wear-resistant coatings, but it consumes a lot of energy. In addition, chromium pollutes the environment, so it can only be used under special approval. However, the ultra-high-speed laser cladding equipment now provides us with a more economical method. The metal additive manufacturing processes does not require the application of chemical raw materials and is very environmentally friendly. Different from the electroplated chromium layer, the coating prepared by the ultra-high-speed laser cladding technology is metallurgically bonded with the substrate, and the coating is not easy to peel off. In addition, the surface coating prepared by the ultra-high-speed laser cladding technology does not have the common pores and cracks in the hard chromium layer, and its protective effect is more durable and effective.
Laser Cladding Equipment VS Thermal Spray
Thermal spraying technology also has shortcomings. The powder material and gas consumption during the processing process is relatively large, and the maximum material utilization rate is only about 50%. And binding of the coating and the substrate is weak. On the other hand, due to the large number of pores in the coating prepared by thermal spraying, multilayer deposition must be used during processing (each layer is about 25-50 μm thick). Compared with the thermal spraying method, the material utilization rate of the newly developed ultra-high-speed laser cladding equipment is as high as 90%, which significantly improves the utilization rate and economy of metal powder. The single-layer coating repaired by ultra-high-speed laser cladding not only has no pores, but is also firmly bonded to the substrate.
The Metal Additive Manufacturing Processes VS Surfacing Technology
Surfacing is often used to produce high-quality, strong coatings. Traditional surfacing processes such as tungsten inert gas shielded welding or plasma arc powder deposition technology generally have thicker coatings (approximately 2-3mm) and consume a lot of materials. The ultra-high-speed laser cladding technology can melt the powder particles by the laser above the molten pool, which means that the powder material enters the molten pool in liquid form, not in the state of solid particles, so the cladding layer will be more homogeneous; Moreover, the amount of melting of the base material by the laser is very limited, only a few microns deep on the surface, not the millimeter scale.
Ultra-High-Speed Laser Cladding Equipment VS Traditional Laser Cladding Machine
The processing efficiency of traditional laser cladding technology is generally low. For example, in the traditional cladding process, the cladding line speed is generally 600-1000mm/min, and the cladding efficiency is generally 0.15㎡/h. Moreover, traditional laser cladding is mainly based on individualized single-piece processing, which is difficult to mass produce. However, the ultra-high-speed laser cladding speed is 100-250 times faster than the traditional laser cladding, and the rapid preparation of large-area coatings can be completed in a short time. At the same time, the ultra-high-speed laser cladding can minimize the thermal impact of the laser on the substrate, so that the coating preparation of heat-sensitive material parts can be realized, and there is basically no damage to the surface of the workpiece.
Shandong LEIYAN Laser Technology Co., Ltd. is a high-tech company jointly established by Jinan SENFENG Technology Co., Ltd. and the Laser Research Institute of Shandong Academy of Sciences, dedicated to the industrial application and promotion of laser cladding technology. The company has established a laser cladding technology research and development center, production and processing center. Based on the application requirements of a large number of domestic and foreign customers, customized development process and core equipment, with the ability to provide customers with industrial application technical services, including powder material selection, equipment configuration, process control, technical support and upgrade services. If you want to know more about laser cladding machine, please contact SENFENG LEIMING.
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