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JWJ > Volume 37(5); 2019 > Article
Journal of Welding and Joining 2019 October;37(5) :508-513.
Published online October 25, 2019.
doi:https://doi.org/10.5781/JWJ.2019.37.5.11
Effect of the Laser Beam Spot Size and Process Parameters on the Cross Section of SUS316L Parts using DED(Directed Energy Deposition)
SeongSeon Shin1  , JongHoon Lee1  , SungWook Kim2  , JunHo Hwang1  , HyunDeok Kim1,3 
1Institute of Advanced Convergence Technology, Kyungpook Nat. Univ., Daegu 41566, Korea
1,3School of Electronics Engineering, Kyungpook Nat. Univ., Daegu 41566, Korea
2Materials Solution Research Group, Research Institute of Industrial & Technology, Pohang 37673, Korea
Correspondence: JunHo Hwang  Email: hdkim@knu.ac.kr, hjh@iact.or.kr
HyunDeok Kim  Email: hdkim@knu.ac.kr, hjh@iact.or.kr
Received September 30, 2019  Revised October 11, 2019  Accepted October 21, 2019  Published online October 25, 2019
ABSTRACT
This study looks into the significant effects of laser beam spot size in the directed energy deposition of SUS316L stainless steel, to determine optimal conditions. In the paper, the beam spot size was varied and measured by adjusting the vertical displacement of the focal point. The experimental test results, specifically optical microscope images, showed that the cross-sectional view of the deposited layer was clearly different when the focal length was changed. Also, the paper investigates the effect of other process parameters such as laser power output, powder feeding rate and gas feeding rate on the directed energy deposition process. An experimental test showed that feeding powder loss was increased when the gas feeding rate and powder feeding rate were increased. This paper also includes experimental test results showing that the dilution ratio and heat-affected zone rely on the laser power outputs.
Keywords: Metal powder(SUS316L) | Laser deposition | Laser spot size | Deposition cross-section | Dilution | DED(Direct Energy Deposition)
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