Design and experimental study of multi-hole coaxial powder feeding system for laser cladding
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School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou 510640, China
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Corresponding author:
YANG Yong-qiang, meyqyang@scut.edu.cn
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Received Date:
2010-03-09
Accepted Date:
2010-04-01
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Abstract
To solve the problems of unsatisfied water-cooling and deposit deviation induced by gravity during laser cladding, a series of feeding nozzles distributed radially and symmetrically was designed to obtain satisfied powder stream and improve cladding quality (the main structure including laser beam routeway, shielding gas routeway, water-cooling routeway and gas feeding routeway). It was found that the powder pooling was satisfied during experiments conducted under conditions that the angles between the nozzle and horizontal plane were 90, 60, 30 and 0 respectively. Some experiments were also conducted adopting powders of Ti, Ni and tool steel respectively. Powders were fed stably and uniformly during experiments. The cladding samples with smooth surface and homogeneous microstructure were metallurgically bonded with the substrate. Experimental results show that the nozzles are satisfactory for powder feeding in laser cladding and can be used for material synthesis of powders. The system is suit for surface modification and 3-D solid fabrication.
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