In the past ten years, laser cladding technology has continuously taken the pace of application testing, from the repair of gears, molds, rotors, rolls and other parts in the general industrial manufacturing field to high-performance special parts in the aerospace and military fields with gradient functions Materials, super hard materials.
Now, laser cladding technology has taken a new step-promotion and application. According to relevant media reports, ultra-high-speed laser cladding technology has an annual market capacity of nearly 2 billion euros.
Ultra-high-speed laser cladding
The increasingly mature laser cladding has good controllability, which greatly reduces the probability of the occurrence of previously existing "local processing area defects" and other undesirable phenomena, laying a solid technical foundation for large-scale application in manufacturing. The new ultra-high-speed laser cladding technology introduced now can meet the requirements of multi-material processing in multiple industries.
Ultra-high-speed laser cladding does not require a mold. It only needs to use CAD software to draw a graphical model, which can be processed after programming. Because the entire molding process is precisely controlled by an intelligent system, it can be used directly after being processed with almost no subsequent processing. For some parts that are urgently repaired but difficult to produce, the most appropriate solution for ultra-high-speed laser cladding technology.
Laser cladding industry, worth looking forward to
Of course, in addition to turning decay into magic, ultra-high-speed laser cladding technology has another far-reaching positive meaning-saving social resources.
The production of many parts requires molds, and manufacturing molds takes a lot of time. For some companies that often need to develop new products, this is a very large cost investment. The use of ultra-high-speed laser cladding technology can shorten this production cycle and directly enter the product manufacturing process. For society, ultra-high-speed laser cladding technology saves a lot of resources, especially some precious and rare metal resources. Global Strategy for Sustainable Development. Therefore, the future of ultra-high-speed laser cladding technology is very worth looking forward to.
Also worth looking forward to is the development of supporting industries. The mature application of a set of laser processing technology is the result of the collaboration of multiple technologies and equipment. In the field of laser cladding cooling, the industry has mature solutions.
At present, the construction and development of various industries in the global energy sector are increasingly diversified, and the downstream industries that are changing in parallel with it are constantly adjusting the pattern to meet this demand. For example, in recent years, the development trend of the rapid shift of the petroleum industry to inland oilfields and offshore oilfields, the development trend of the power industry from thermal power below 300,000 kilowatts to thermal power above 300,000 kilowatts, and hydropower and nuclear power ...
In addition, the energy-saving and environmental protection concept is firmly put on the manufacturer's head like a "cuff spell", which promotes breathing valves, steam traps, high-pressure valves, pressure reducing valves, quick opening and closing valves, flame arrestors, filters, pipes Products such as sight glasses have to be changed in processing or manufacturing technology to meet the requirements of use. Valve applications are much more than that, such as a large number of low-pressure pump valves widely used in urban construction systems, flat gate valves and ball valves used in oil and gas pipeline construction, and so on. Therefore, the demand for valves will be very large.
The operating conditions of the valve are mostly abrasion, concentrated corrosion sources, high pressure and temperature. Therefore, how to improve the abrasion resistance, corrosion resistance, and high temperature strength of valves under high temperature and high pressure conditions has become a technical problem that many companies are eager to solve. Among them, the laser cladding technology has attracted the most attention. Now we will introduce the application of laser rapid cladding.
The application of laser rapid cladding repair, laser rapid cladding technology can significantly improve the wear resistance, corrosion resistance, heat resistance and oxidation resistance of metal surfaces. Compared with traditional surface treatment technologies such as surfacing, thermal spraying and electroplating, it has many advantages, such as a wide range of applicable material systems, controllable cladding layer dilution rate, metallurgical combination of the cladding layer and the substrate, small thermal deformation of the substrate, The process is easy to automate.
According to the characteristics of the rapid laser cladding process and the preparation of special materials for laser cladding, the following factors should be considered:
1. Absorption coefficient: Different materials have different reflection coefficients for different wavelength lasers under different conditions. According to the specific process of laser cladding, materials with lower laser reflection should be selected to increase the laser absorption coefficient during laser cladding.
2. Crack control: The laser cladding process is quenched and heated rapidly, and the temperature gradient of the laser molten pool is large. When choosing an alloy system, consideration should be given to avoid the formation of cracks in the alloy during rapid solidification.
3, performance meets: According to the performance requirements of the cladding layer, adjust the alloy composition of the cladding material. The wear-resistant cladding layer should be added to form a high wear-resistant phase element, the corrosion-resistant cladding layer should be added to form a stable passivation film element, and the high-temperature-resistant oxidation cladding layer should be added to form a dense oxide film element
The powder feeder required for laser rapid cladding has several effects on the quality of laser cladding molding, the powder feeding rate per unit time and the powder feeding speed. The powder feeding rate per unit time refers to the mass of powder that the laser rapid cladding powder feeder can transport in a unit time. The powder conveying speed refers to the speed of the laser rapid cladding powder feeder to convey the powder to the molten pool. The two characteristics of the powder feeder directly determine the sturdiness, uniformity and dilution rate of the cladding layer.