Parameters mensuration of metal powder flow in laser cladding

被引：0
|
作者：
Yang N. [1 ]
Dong H. [2 ]
机构：
[1] Tianjin Key Laboratory for Control Theory and Applications in Complicated Systems, Tianjin University of Technology
[2] School of Mechanical Engineering, Dalian Jiaotong University, Dalian
来源：
Guangxue Xuebao/Acta Optica Sinica | 2011年 / 31卷 / SUPPL.1期
关键词：
Laser cladding; Laser technique; Panticle image velocimetry; Velocity vector field;
D O I：
10.3788/AOS201131.s100108
中图分类号：
学科分类号：
摘要：
In laser cladding, the movement of the metal powder particles influences the cladding results directly. However, the movements of the metal powder particles are too hard to measure because the average diameter of the particles is about 50 μm and the movement behavior is very complex (collision of each other). The image process method based on digital particle image velocimetry (DPIV) technology is used to recognize the most particles. By this means, two images of the particle stream with a time interval are provided to determine the displacements of particles. Therefore, the velocity-vector field of the whole powder stream is obtained. Then, the convergence angle and the divergence angle of the powder flow can be measured by the velocity vectors, and the convergence region can be determined by the region of the maximum intensity of light. Results show that DPIV meets the needs of laser cladding and plays the role of guidance.
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