Michale's personal diary

High Speed Laser Cladding Technology
As a surface modification technology of metal materials, laser cladding can effectively change the hardness, wear resistance, corrosion resistance and high temperature resistance of metal surfaces. For more than half a century, the technology has been continuously improved and developed in practical applications. In addition to materials and processes, high power laser pointer and powder feeding technologies have been continuously upgraded. In the 1980s and 1990s, cladding lasers were mainly CO2 lasers and YAG lasers. After 2010, semiconductor lasers (both direct output and fiber coupled output) appeared. In recent years, fiber lasers have begun to compete for the cladding market of semiconductor lasers.

https://www.htpow.com/high-powered-30000mw-blue-laserpointer-445nm-worlds-brightest-p-1027.html

At the same time, people are constantly exploring ways to improve the function of powder and laser, and invented a variety of powder feeding techniques, including preset powder feeding, side-by-side feeding and center feeding. The preset powder feeding adopts the powder laying or gravity powder feeder to preset the powder on the path through which the spot passes. The preset powder feeding technology is simple, the powder feeding process has no powder splash, the powder utilization rate is high, but the versatility is not strong. The side-by-side powder feeding adopts pneumatic method to send the powder into the spot, the side-by-side powder is divided into asymmetric side feeding powder and symmetric coaxial feeding powder, and the side feeding powder is easily affected by the moving direction, and the cladding quality is relatively high. difference. Coaxial powder feeding has good quality and versatility. Coaxial pneumatic powder feeding is a “powder-packing” technique that uses a multi-beam converging powder stream or a ring-shaped converging powder stream to surround the central military laser pointer beam. The center powder feeding is also a pneumatic powder feeding method. It is a kind of "optical powder coating" technology, which is designed to surround the center powder flow by designing a hollow beam.

https://www.htpow.com/htpow-blue-ultra-power-laser-pointer-30w-class-iv-laser-p-1106.html

Compared with the coaxial pneumatic powder feeding, the central powder feeding is characterized in that the powder is a single powder flow, and there is no mutual impact scattering of the powder flow in different directions. In addition, in the vertical down-cladding process, a lower powder feed pressure can be used, so that on the one hand, the powder flow rate is relatively slow, the powder and the laser act for a long time, and the powder is more easily melted over the molten pool. On the other hand, the lower powder flow rate also reduces the ejection between the powder flow and the substrate. The practical application shows that the splash of the high-speed cladding cladding process in the center powder feeding is obviously reduced, the spark is quite gentle, and the powder utilization rate is greatly improved.

https://www.htpow.com/industrial-laser-c-38_48.html