Research on ultra-high speed laser cladding process of corrosion resistant layer of tungsten rod for molten salt electrolysis

The cathode for molten salt electrolysis is a pure tungsten rod formed by powder sintering, which has a high melting point and poor welding performance. The traditional welding process cannot satisfy the surface cladding of the tungsten cathode. This experiment uses advanced ultra-high-speed laser cladding technology, combined with computer stress and temperature field simulation, using optical microscope (OM) and scanning electron microscope (SEM) for bonding surface observation, using energy spectrum (EDS) for element diffusion analysis, and using display Microhardness tester analyzes the performance analysis of the bonding layer. The results show that the use of ultra-high-speed laser cladding technology can realize the corrosion-resistant layer cladding on the tungsten substrate. The use of powder with a thermal expansion ratio equivalent to the substrate and the preheating process before the tungsten substrate cladding can effectively avoid internal stress. The phenomenon of cracking; through observation of the bonding interface, it can be obtained that the cladding layer is well bonded to the substrate, and the cladding bonding layer formed has no cracks at the interface.