Journal of Welding and Joining

  • 제30권6호
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  • Pages.98-105
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  • 2012
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  • 2466-2232(pISSN)
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  • 2466-2100(eISSN)
대한용접접합학회 (The Korean Welding and Joining Society)
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이종 알루미늄 합금 KS5J32/AA6K31 겹치기 마찰교반 접합부의 인장성질에 미치는 접합조건의 영향

Effect of Welding Condition on Tensile Properties of Friction Stir Lap Joint of Dissimilar Al Alloy, KS5J32/AA6K31

  • 김상주 (부산대학교 하이브리드 소재솔루션 국가핵심연구센터) ;
  • 윤태진 (부산대학교 하이브리드 소재솔루션 국가핵심연구센터) ;
  • 송상우 (한국기계연구원 부설 재료연구소) ;
  • 강정윤 (부산대학교 하이브리드 소재솔루션 국가핵심연구센터)
  • Kim, Sang-Ju (National Core Research Center, Pusan National University(NCRC)) ;
  • Yoon, Tae-Jin (National Core Research Center, Pusan National University(NCRC)) ;
  • Song, Sang-Woo (Korea Institute of Materials Science(KIMS)) ;
  • Kang, Chung-Yun (National Core Research Center, Pusan National University(NCRC))
  • 투고 : 2012.11.20
  • 심사 : 2012.12.07
  • 발행 : 2012.12.31
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초록

The focus of this investigation is to evaluate the effect of joining parameter on the microstructure and mechanical properties of welds produced by friction stir lap welding. The dissimilar Al alloys, KS5J32 and AA6K31, were joined by friction stir lap welding technique under several welding conditions, and KS5J32 alloy was placed on the top of AA6K31 alloy. The tool rotation speeds were 1000, 1250, and 1500rpm, and the welding speeds were 100, 300, 500, 700mm/min, respectively. The results showed that two shapes of nugget, such as onion ring and irregular vortex type, were observed with various revolutionary pitch. In all welding conditions, fracture occurred at the soften region of bottom sheet(AA6K31) and the strengths were 64~78% of those of base metal. Fractured positions were classified into three types : HAZ, triple point, void depending on the revolutionary pitch. The actual thickness of specimen at the fractured location was decreased with decreasing heat input. A linear relationship exists between the effective thickness of fractured position and peak load.

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