Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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Effect of Process Parameters on Friction Stir Welds on AA2219-AA2195 Dissimilar Aluminum Alloys

마찰교반접합의 공정변수가 AA2219-AA2195 이종 알루미늄 접합에 미치는 영향

  • No, Kookil (Department of Aerospace System Engineering, University of Science & Technology) ;
  • Yoo, Joon-Tae (Launcher Structure & Materials Team, Korea Aerospace Research Institute) ;
  • Yoon, Jong-Hoon (Launcher Structure & Materials Team, Korea Aerospace Research Institute) ;
  • Lee, Ho-Sung (Department of Aerospace System Engineering, University of Science & Technology)
  • 노국일 (과학기술연합대학원대학교 항공우주시스템공학전공) ;
  • 유준태 (한국항공우주연구원 발사체구조팀) ;
  • 윤종훈 (한국항공우주연구원 발사체구조팀) ;
  • 이호성 (과학기술연합대학원대학교 항공우주시스템공학전공)
  • Received : 2017.01.06
  • Accepted : 2017.03.30
  • Published : 2017.06.27
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Abstract

This study was carried out to investigate the optimum condition of a friction stir welding process for a joint of AA2219-T87 and AA2195-T8 dissimilar aluminum alloys. These alloys are known to have good cryogenic properties, and as such to be suitable for use in fuel tanks of space vehicles. The welding parameters include the travelling speed, rotation speed and rotation direction of the tool. The experiment was conducted under conditions in which the travelling speed of the tool was 120-300 mm/min and the rotation speed of the tool was 400-800 rpm. To investigate the effect of the rotation direction of the tool, the joining was performed by switching the positions of the two dissimilar alloys. After welding, the microstructure was observed and the micro-hardness were measured; non-destructive evaluation was carried out to perform tensile tests on defect-free specimens. The result was that the microstructure of the weld joint underwent dynamic recrystallization due to sufficient deformation and frictional heat. The travelling speed of the tool had little effect on the properties of the joint, but the properties of the joint varied with the rotation speed of the tool. The conditions for the best joining properties were 600 rpm and 180-240 mm/min when the AA2219-T8 alloy was on the retreating side(RS).

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  1. Friction Stir Welding of Dissimilar Aluminum Alloy Combinations: State-of-the-Art vol.9, pp.3, 2019, https://doi.org/10.3390/met9030270