Application Of Laser Cladding Technology In Chemical Industry

Laser cladding uses a high-energy laser as a heat source and alloy powder as a cladding material. The alloy powder is irradiated by laser and acts on the surface of the workpiece to rapidly melt to form a molten pool, and then rapidly solidifies 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.

Using laser cladding technology to clad a layer of coating with special properties on the surface of the designated area of the workpiece, it can improve the surface properties of the workpiece, make the important parts have the characteristics of super wear resistance and anti-corrosion, and greatly improve the service life of the parts .

After the chemical industry ball valve is produced, the cladding surface should be modified. The cladding thickness is required to be 1.2mm, and there are no defects such as porosity and cracks. It has high corrosion resistance requirements, and the hardness of the cladding layer is above 55HRC.

In the petrochemical industry, the equipment has been in a harsh working environment for a long time, which is easy to cause serious corrosion and wear of components, and even lead to the complete scrapping of large and expensive components. The laser cladding technology is possible to repair some expensive parts and inconvenient replacement parts. The strength of the repaired parts will be twice that of the original parts, and the cost of new parts will be saved for enterprises.

Components that often cause problems in chemical equipment include valves, pumps, impellers, large rotor journals, discs, bushings, and more. The cladding repair of chemical industry ball valves and shaft parts after failure, the cladding thickness is 1 mm, there are no defects such as pores and cracks, and it has certain corrosion resistance, and the hardness of the cladding layer is above 50HRC.

Advantages of laser cladding:

1. During laser cladding, the heat-affected zone on the substrate is small, and the deformation of the workpiece is small.

2. Metallurgical bonding can be achieved between the cladding layer and the base material, and the dilution rate of the cladding material is low.

3. The cladding layer has fine grains and dense structure, and can obtain higher hardness, wear resistance and corrosion resistance.

4. Selective local minor repairs can be achieved, effectively reducing maintenance costs.

5. The adaptability of the powder material system is relatively high, and most conventional and special metal powder materials can be clad on the surface of metal parts.



Laser cladding can also be used in other industries such as iron and steel metallurgy, automobiles, construction machinery, mold manufacturing and ships, and has very broad application prospects. With the continuous advancement of the “Made in China 2025” development plan, laser cladding technology will surely be accepted by the majority of industrial users, bringing more benefits and value to industrial production.

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