Introduction：

High-speed laser cladding technology is currently a relatively advanced green metal surface treatment technology, which can be used to replace traditional process technologies such as electroplating, hot coating, plasma cladding, etc. WILA explains the characteristics of each process, focusing on the characteristics of high-speed laser cladding technology.

Electroplating process：

The development of the hard chromium electroplating process is very mature, and it is one of the anti-corrosion and wear-resistant coating technologies widely used in the past. The manufacturing process is to diffuse the workpiece in a chromic acid solution and deposit the coating by electrochemical methods. The prepared hard chromium coating is generally accompanied by micro-cracks, and the bonding force between the coating and the substrate is poor, and cracks often appear during service. And peeling phenomenon. Due to the huge power consumption of electroplating, its profit margin has been repeatedly compressed. In addition, the waste gas and waste liquid produced in the production process also cause pollution to the environment. At present, the electroplating industry has become a sunset industry, subject to strict restrictions by the European Union, the United States, and China. The ultra-high-speed laser cladding process does not involve chemical processes and is environmentally friendly. Many types of hard-surface coatings can be used, including iron-based, nickel-based, and cobalt-based alloy coatings. The coating produced by this method is defect-free, has high bonding strength, and has higher durability than electroplated coatings. At present, ultra-high-speed laser cladding is the preferred technology to replace hard chromium plating.

Thermal spray process：

The spray coating deposition rate is high, but the powder utilization rate is only 50%. The coating has a porosity of 1%~2%, and the corrosive medium can cause pit corrosion to the substrate through these gaps. The bonding strength between the thermal spray coating and the substrate is generally less than 150MPa, and coating peeling (mechanical bonding) may occur under heavy-duty service conditions. In addition, thermal spraying is prone to noise and dust pollution during work, which affects the environment and the health of personnel. The ultra-high-speed laser cladding prepares the coating with dense structure and no porosity, and the coating and the substrate are metallurgically combined with high bonding strength.

Surfacing technology：

The surfacing technology can prepare high-quality defect-free metal coatings, such as argon tungsten arc welding and plasma spray welding. The interface is metallurgical bonding, and the bonding strength is high. The thickness of the single-layer deposition can reach 2mm~3mm, which is compared with thermal spraying. Layer 25-50μm, and traditional laser cladding single layer 0.5mm~1mm deposition thickness, the deposition efficiency of surfacing technology is higher. However, high deposition efficiency is accompanied by high energy input, which induces the transformation of the structure and properties of the matrix material and thermal damage.

Comparison of ultra-high-speed laser cladding technology and traditional laser cladding:

After ultra-high-speed laser cladding, the surface of the workpiece is Ra~5-10um; after cladding, it is directly ground and polished 0.15-0.20mm, and the surface can reach a mirror finish, Ra≤04; high processing efficiency, WILA 6000W high-speed laser cladding equipment processing 0.8mm thickness Coating, processing efficiency 08m2/h，Powder dilution rate ＜3%

Conventional laser cladding: surface undulation is 0.4-0.5mm, follow-up processing: turning + grinding + polishing，Powder dilution rate 5-15%

Conclusion：