Journal of Welding and Joining

The Korean Welding and Joining Society (대한용접접합학회)
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Optimum Design of the Friction Stir Welding Process on A6005 Extruded Alloy for Railway Vehicles to Improve Mechanical Properties

마찰 교반 용접된 철도 차량용 A6005 압출재의 기계적 성능 향상을 위한 최적 공법 설계

  • Won, Si-Tea (Dept. of Die & Mould Engineering, Seoul National University of Technology) ;
  • Kim, Weon-Kyong (Korea Railroad Research Institute)
  • 원시태 (서울산업대학교 금형설계학과) ;
  • 김원경 (한국철도기술연구원 시험인증센터)
  • Published : 2009.10.31
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Abstract

Recently, extruded aluminium-alloy panels have been used in the car bodies for the purpose of the light-weight of railway vehicles and FSW(Friction Stir Welding), which is superior to the arc weldings, has been applied in the railway vehicles. This paper presents the optimum design of the FSW process on A6005 extruded alloy for railway vehicles to improve its mechanical properties. Rotational speed, welding speed and tilting angle of the tool tip were chosen as design parameters. Three objective functions were determined; maximizing the tensile strength, minimizing the hardness and maximizing the difference between the normalized tensile strength and hardness. The tensile tests and the hardness tests for fifteen FSW experiments were carried out according to the central composite design table. Recursive model functions on three characteristic values, such as the tensile strength, the hardness difference(${\Delta}Hv$) and the difference of normalized tensile strength and ${\Delta}Hv$, were estimated according to the classical response surface analysis methodology. The reliability of each recursive function was verified by F-test using the analysis of variance table. Sensitivity analysis on each characteristic value was done. Finally, the optimum values of three design parameters were found using Sequential Quadratic Programming algorithm.

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References

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