Effects of Process Parameters on Temperature Field of Laser Cladding Ni-Base Alloy on Aluminum Bronze

Using aluminum bronze as the base material, copper-nickel alloy powders as the coating material, the distribution of temperature field was simulated in the process of laser cladding by numerical simulation technology. The effects of process parameters on the temperature field were investigated. The process parameters were optimized and then validated. The results show that the peak temperature of the cladding layer was in proportion to the elevation of laser power when the scanning speed was constant. When the laser power was the same, the peak temperature was in proportion the preheating temperature and the spot diameter, while in inverse proportion to the scanning speed. A good laser cladding could be obtained when the preheating temperature was 200 ℃, the laser power was gradually decreased from 3 800 W to 2 000 W in the laser cladding process, the diameter of laser spot was 4 mm and laser scanning speed was 6-8 mm·s-1.