Numerical simulation of powder transport behavior in laser cladding with coaxial powder feeding

• Published in: Science China. Physics, mechanics & astronomy mechanics & astronomy, 2015-10, Vol.58 (10), p.28-37, Article 104701
• Main Authors: Liu, Hao, He, XiuLi, Yu, Gang, Wang, ZhongBin, Li, ShaoXia, Zheng, CaiYun, Ning, WeiJian
• Format: Article
• Language: English
• Subjects: Astronomy; Classical and Continuum Physics; Coaxial nozzles; Laser beam cladding; Lasers; Mathematical models; Numerical models; Observations and Techniques; Particle size; Physics; Physics and Astronomy; Three dimensional models; 三维数值模型; 传输特性; 同轴送粉; 数值模拟; 碰撞行为; 粉末流动; 表面性能; 送粉激光熔覆
• ISSN: 1674-7348; 1869-1927
• DOI: 10.1007/s11433-015-5705-4

Laser cladding with coaxial powder feeding is one of the new ponent to improve performance of its surface. In the process, processes applied to produce well bonding coating on the com- the clad material is transported by the carrying gas through the coaxial nozzle, generating gas-powder flow. The powder feeding process in the coaxial laser cladding has important influence on the clad qualities. A 3D numerical model was developed to study the powder stream structure of a coaxial feeding nozzle. The predicted powder stream structure was well agreed with the experimental one. The validated model was used to explore the collision behavior of particles in the coaxial nozzle, as well as powder concentration distribution. It was found that the par- ticle diameter and restitution coefficient greatly affect the velocity vector at outlet of nozzle due to the collisions, as well as the powder stream convergence characteristics below the nozzle. The results indicated a practical approach to optimize the powder stream for the coaxial laser cladding.