Application of laser cladding in Chemical Industry
Views: 13 Author: Rebecca Publish Time: 2021-10-15 Origin: Site
Laser cladding uses a high-energy laser as the heat source and alloy powder as the cladding material. The alloy powder is simultaneously irradiated by the laser to quickly melt on the surface of the workpiece to form a molten pool, and then rapidly solidify to form a dense, uniform and thickness-controllable metallurgical bonding layer. Improving the wear resistance, corrosion resistance, high temperature resistance, oxidation resistance and other properties of metal parts can not only restore the use of failed parts, but also significantly extend the service life of new parts.
Modification of new parts
The laser cladding technology is used to deposit a layer of special performance coating on the specified area of the workpiece surface, which can improve the surface performance and make the important parts possess the characteristics of super wear resistance and corrosion resistance, and greatly improve the service life of the parts.
After the ball valve in the chemical industry is produced, the cladding surface modification is required: a cladding thickness of 1.2mm, no defects such as pores and cracks, with high corrosion resistance requirements and a cladding layer hardness of 55HRC or more.
Old parts repair
In the petrochemical industry, the equipment is exposed to the harsh working environment for a long time. It is easy to cause severe corrosion and wear of parts, and even lead to the complete scrapping of large and expensive parts. Laser cladding technology provides the possibility to make some expensive parts repaired which are inconvenient to dismantle. Moreover, the strength of the repaired component will be twice that of the original component, and it will save the company the cost of purchasing new components.
The parts that often cause problems in chemical equipment include valves, pumps, impellers, large rotor journals, roulettes, bushings, bearing bushes, etc., and cladding repairs after failure of ball valves and shaft parts is widely used in the chemical industry. It requires cladding thickness of 1.2mm, no defects such as pores and cracks, with high corrosion resistance requirements and a cladding layer hardness of 55HRC or more.
①The heat-affected zone generated on the substrate during laser cladding is small, so is the deformation of the workpiece.
②Metallurgical bonding can be achieved between the cladding layer and the base material, and the dilution rate of the cladding material is low.
③The cladding layer has fine grains and compact structure, which can obtain higher hardness, wear resistance and corrosion resistance.
④ Selective partial repair can be achieved, effectively reducing repair costs.
⑤The powder material system has relatively high adaptability, and most conventional and special metal powder materials can be deposited on the surface of metal parts.
Advantage:
1. You can choose different shape of laser spot, according to the requirements of different cladding applications;
2. The beam quality is stable, and the cladding effect is consistent;
3. Stable power and excellent cladding speed;
4. The laser energy is evenly distributed, making it easier to control the cladding dilution rate, and the high-speed cladding dilution rate is less than 3%;
5. The output light spot is distributed in a circular flat top, and there is no anisotropy, which is suitable for laser cladding three-dimensional molding.
In addition, laser cladding can also be applied to other industries such as iron and steel metallurgy, automobiles, engineering machinery, mold manufacturing and ship building, and has a very wide range of application prospects. Laser cladding technology will surely be accepted by the majority of industrial users and bring more benefits and value to industrial production. Contact us for more information!
