1.1 What is the application of laser cladding technology in the aerospace industry?

Laser cladding technology is not only used to manufacture components required by the aerospace industry but also plays a significant role in the repair and maintenance of these components. In the 1980s, Rolls Royce applied laser cladding to the joint parts and turbine blades of the RB211 turbojet engine. Later, AeroMet, a U.S. company, produced two full-size joint parts for the F-22 fighter aircraft, which doubled their service life. Components made using laser cladding technology, particularly titanium alloys, have significantly better performance compared to those made by conventional machining methods. This not only saves 20% to 40% of costs but also shortens production cycles significantly.

1.2 How does laser cladding technology perform in the automotive industry?

In the automotive industry, components such as engine pistons, valves, and cylinder grooves have high requirements for wear resistance, oxidation resistance, and high-temperature resistance. After undergoing laser cladding, the service life of these parts can be effectively extended, reducing economic costs. Russia has extensive experience in using laser cladding technology for automotive component repairs, including crankshafts, drive shafts, and camshafts. After cladding, the hardness and wear resistance of these components have significantly improved, extending their service life by 2 to 4 times and greatly enhancing their performance.

1.3 How is laser cladding technology applied in the petroleum industry?

The working environment in the petroleum industry is typically harsh, with many components subjected to high pressure and corrosive conditions, leading to premature failure. Stopping for repairs and replacing components increases material costs and affects normal oil field production. Traditional surface treatment technologies are often ineffective for such vulnerable components, limiting their applicability. However, laser cladding technology, which involves coating the substrate with a layer of material, enhances the wear resistance, high-temperature oxidation resistance, and other properties of these components, while also reducing production costs. Jianghan Drill Bit Factory, in cooperation with Huazhong University of Science and Technology, used laser cladding to coat WC on steel tooth drill bits, significantly improving their wear resistance compared to hydrogen atom welding techniques.

1.4 What other industrial fields benefit from laser cladding technology?

Laser cladding technology has wide applications across various industries, including coal, iron ore, and the railway sector. It is applied to components like hydraulic equipment, generators, ball mills, gears, washing equipment, and train bogie brake pads. In the cement and construction industries, laser cladding is used for crusher spindles, motor shafts, mixer spindles, and gear shafts. In the construction machinery industry, it is applied to gear shafts, brake discs, engine cylinders, and crankshafts. Laser cladding technology is also utilized in water conservancy, printing, papermaking, and food industries. Any machinery with components prone to wear, damage, or corrosion can benefit from laser cladding technology for repair or improvement, thereby reducing equipment costs, extending service life, and promoting the development of laser cladding technology.

What are the development defects in laser cladding technology?

Although laser cladding technology holds vast potential for application, there are still some issues in practice, mainly in the inconsistent quality of the cladding layers and difficulty in controlling the process.

2.1 Why do cracks occur in the laser cladding layer?

In laser cladding, materials are rapidly melted and solidified. The substantial differences in the physical properties between the substrate and the cladding material can result in significant tensile stresses on the cladding layer. If these tensile stresses are too high, the cladding material may crack, which negatively affects the application of laser cladding.

2.2 Why does porosity occur in the laser cladding layer?

Porosity is another significant defect that affects the quality of the cladding layer. The presence of pores not only lowers the quality of the cladding but also increases the likelihood of cracks, further reducing the performance of the cladding layer.

What is the future development direction of laser cladding technology?

With the advancement of technology, laser cladding technology will face new opportunities for industrial development. The primary research directions for the future include: (1) adopting scientific methods to fundamentally address the issues of cracks and porosity; (2) establishing process parameters and outcome databases; (3) developing and promoting a theoretical framework for cladding technology; and (4) combining experimental theory with practical applications.