Laser Cladding Repair Process and Application Examples for the Inner Wall of Casting Pump Cavity

Laser cladding technology is a new surface treatment technology with advantages such as speed, efficiency, energy savings, and environmental friendliness. It is widely used for surface repair and reinforcement of various materials. Laser cladding technology is also extensively applied in the repair of casting pump chamber inner walls.

I. Process Flow of Laser Cladding Repair for Casting Pump Chamber Inner Walls

The laser cladding repair of casting pump chamber inner walls mainly includes the following steps:

1. Cleaning of the Casting Pump Chamber Inner Wall: Before laser cladding, the inner wall of the casting pump chamber must be cleaned to remove surface contaminants, oil stains, rust, and other impurities to ensure repair quality.

2. Preheating: To reduce the heat-affected zone during laser cladding and improve the bonding strength of the cladding layer, preheating is necessary. The preheating temperature is generally controlled at around 200°C.

3. Laser Cladding Repair of the Casting Pump Chamber Inner Wall: The selected laser cladding material is uniformly applied to the inner wall of the pump chamber using a powder feeder or sol-gel method. The coating is then melted and rapidly solidified by laser beam irradiation, forming a cladding layer that tightly bonds with the base material.

4. Post-Treatment of Laser Cladding on the Casting Pump Chamber Inner Wall: After laser cladding is completed, post-treatment is required, including grinding, polishing, and heat treatment, to improve the surface quality and performance of the cladding layer.

II. Material Selection for Laser Cladding Repair of Casting Pump Chamber Inner Walls

Material selection is critical in the laser cladding repair of casting pump chamber inner walls. Based on the usage requirements and working conditions of the casting, high-performance cladding materials are chosen. Commonly used cladding materials include nickel-based alloys, cobalt-based alloys, and iron-based alloys. These materials offer excellent wear resistance, corrosion resistance, and high-temperature resistance, significantly extending the service life of the casting pump chamber.

III. Performance of Laser Cladding Layers on Casting Pump Chamber Inner Walls

The cladding layers prepared using laser cladding technology exhibit excellent mechanical and physical properties, meeting the requirements of casting pump chambers. Firstly, the cladding layer has high hardness, good wear resistance, and corrosion resistance, effectively resisting the impact of various media and friction. Secondly, the bonding strength between the cladding layer and the base material is strong, making it less prone to peeling or cracking. Additionally, laser cladding technology enables rapid solidification and grain refinement of the cladding layer, further enhancing the material's mechanical properties and high-temperature resistance.

IV. Application Examples of Laser Cladding Repair for Casting Pump Chamber Inner Walls

Laser cladding repair technology for casting pump chamber inner walls has been widely adopted in various fields. For example, in the petrochemical industry, laser cladding repair of oil pump plunger chamber inner walls can effectively enhance the pump's wear and corrosion resistance, extending its service life. In the shipbuilding sector, laser cladding repair of ship propeller pump chamber inner walls can improve the propeller's wear resistance and impact resistance, enhancing the vessel's operational efficiency and safety. Additionally, this technology is widely used in industries such as power generation, metallurgy, and mining.

V. Conclusion

Laser cladding repair technology for casting pump chamber inner walls is an efficient, energy-saving, and environmentally friendly new surface treatment technology. Through reasonable process flows and material selection, it can significantly improve the service life and performance of casting pump chambers. As laser cladding technology continues to develop, its application scope will become increasingly broad. Furthermore, further research into the mechanisms and influencing factors of laser cladding processes, along with optimization of process parameters and technical details, will help enhance repair quality, reduce production costs, and provide strong support for the sustainable development of industrial production.