A Numerical Study on Metallic Powder Flow in Coaxial Laser Cladding

Authors

1 School of Mechanical and Electrical Engineering, China University of Mining and Technology, Xuzhou, Jiangsu, 221116, China

2 Key Laboratory of Mechanics in Advanced Manufacturing, Institute of Mechanics, Chinese Academy of Science, Beijing, 100044, China

3 School of Civil Engineering, Beijing Jiaotong University, Beijing, 100044, China

Abstract

In coaxial laser cladding, the quality and property of deposition products are greatly influenced by the powder flow, which is responsible to transport additive materials to the deposition point on a substrate precisely. The metallic powder flow in coaxial laser cladding is simulated by a numerical model based on the gas-solid flow theory. The characteristics of powder concentration distribution between coaxial nozzle and deposition point for a kind of nickel based alloy powder are studied by the proposed model. The relationship between the process parameters and powder flow characteristics, such as focus distance from the nozzle exit and maximum powder concentration, is analyzed to optimize the powder feeding process. In addition, the influence of substrate with different surface shapes on the powder flow is investigated. The results can be used as a guideline for the location of the substrate and the selection of proper processing parameters for coaxial laser cladding.

Keywords

Journal of Applied Fluid Mechanics
Volume 9, Issue 5
August 2016
Pages 2247-2256

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