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JWJ > Volume 37(4); 2019 > Article
Journal of Welding and Joining 2019 August;37(4) :299-305.
Published online August 23, 2019.
doi:https://doi.org/10.5781/JWJ.2019.37.4.2
FEM Analysis of the High Pressure Applied to an Impeller Blade During Laser Welding
Chang Min Han1  , Hae-Woon Choi2 
1Graduate School of Mechanical Engineering, Keimyung Univ., Daegu, 42601, Korea
2Dept of Mechanical and Automotive Engineering, Keimyung Univ., Daegu, 42601, Korea
Correspondence: Hae-Woon Choi  Email: hwchoi@kmu.ac.kr
Received July 1, 2019  Revised July 25, 2019  Accepted August 6, 2019  Published online August 23, 2019
ABSTRACT
Finite element analysis was used to predict the distribution of stress and deformation during laser welding of high speed impellers. FEM was used to analyze three cases, a lower tap fixed (Case I), a lower boundary fixed (Case II) and a lower boundary and upper tap fixed (Case III). As the applied pressure increased, the stress and deformation increased gradually for all cases. In Case III, where the restrained portion was large, the stress was much higher than Case I or II, however the maximum deformation in Case III was smaller than the other cases. The analysis determined that stress was reduced by deformation of a blade tab region that was unrestrained when pressure was applied to the blade. In addition, maximum stress was generated around the tabs, and it was found that the stress was concentrated on the shape of the corner portion. Analysis determined that stress and deformation are inversely proportional. Weld design can be optimized by considering these results. Stress and deformation can be minimized by optimizing the shape of the stressed part using the finite element method, and performing blade design and laser welding design accordingly.
Keywords: Laser welding | Blade analysis | FEM
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