High-Speed vs. Conventional Laser Cladding: A Comparative Analysis
Over the past two years, high-speed laser cladding technology has received significant attention in China's laser industry and metal surface processing sector. The core reason for this focus is that, compared with conventional laser cladding, it boasts numerous advantages in processing efficiency, precision, cost control, heat input, and workpiece deformation, while also having certain limitations. The two share both commonalities and differences, with high-speed laser cladding achieving breakthroughs in the treatment of non-ferrous metals.
Notable Advantages of High-Speed Laser Cladding
High-speed laser cladding has prominent advantages: its linear speed can reach 100m/min, with cladding efficiency 3-4 times that of conventional cladding; the cladding layer is flat and can be directly ground and polished, saving materials and processing costs; it can handle both thin (0.2-0.3mm) and medium-thick (0.3-1.5mm) coatings, as well as multi-layer cladding in special cases; it results in low heat input to the workpiece and minimal deformation, making it suitable for processing thin-walled parts and small components; the dilution rate is controllable; its high power density enables cladding of high-melting-point powder materials; it can realize surface strengthening of non-ferrous metals such as copper, aluminum, and titanium, with a wide application range, and is currently a viable alternative to electroplating.
Existing Shortcomings of High-Speed Laser Cladding
However, high-speed laser cladding also has drawbacks: the current powder utilization rate is approximately 70%, slightly lower than that of conventional laser cladding, requiring further improvement through technical means; to achieve higher surface quality, it generally uses fine spherical powders of 20-53μm (which helps save materials and reduce processing costs), but such fine powders are slightly more expensive than the 50-150μm coarse powders commonly used in conventional laser cladding; as a new technology, its process is somewhat more complex than that of conventional cladding.
Common Features of High-Speed and Conventional Laser Cladding
The two share many commonalities: they are compatible in cladding materials-all materials that can be clad by conventional laser cladding can also be handled by high-speed laser cladding, and high-speed cladding can even clad high-melting-point materials that conventional cladding cannot; both achieve metallurgical bonding, though the coating of high-speed cladding is smoother (similar to thermal spraying) while conventional cladding has greater surface fluctuations; the key focuses of process route adjustment are consistent; in terms of application fields, high-speed laser cladding can be applied in all areas where conventional laser cladding is used, and can also expand into fields beyond the reach of conventional cladding.
Breakthrough of High-Speed Laser Cladding in Non-Ferrous Metal Processing
Surface strengthening of non-ferrous metals like copper and aluminum has long been an urgent industry need, but it is technically challenging. For non-metallurgical bonding, spraying and electroplating processes can be used; for metallurgical bonding, conventional laser cladding currently uses YAG lasers, but the YAG process is inefficient. Some universities and enterprises have conducted extensive research on other conventional laser cladding routes (such as CO₂, semiconductor, and semiconductor fiber-coupled lasers), but the results are unsatisfactory. The main reason is that copper and aluminum have high thermal conductivity, making it difficult to form a molten pool on the substrate, thus hindering cladding.
Guosheng Laser has applied high-speed laser cladding technology to the surface treatment of non-ferrous metals. Preliminary test results show that high-speed laser cladding can completely address this industry challenge. Its power density is 5-10 times that of conventional laser cladding, with part of the light acting directly on the substrate, enabling the formation of a molten pool on copper and aluminum substrates-which is the main reason high-speed laser cladding can achieve cladding on these metals.
Comprehensive Summary of High-Speed Laser Cladding
In summary, high-speed laser cladding has significant advantages in efficiency, precision, and material applicability. While it has shortcomings such as lower powder utilization, higher powder costs, and greater process complexity, its commonalities with conventional cladding provide a foundation for its application. In particular, its breakthrough in non-ferrous metal processing makes it a highly promising metal surface processing technology.