Journal of Welding and Joining

The Korean Welding and Joining Society (대한용접접합학회)
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The effects of Welding Conditions on Tensile Properties of Friction Stir Lap Welded of Dissimilar Al Alloy, A6K31/A5J32

이종 알루미늄 합금 A6K31/A5J32 겹치기 마찰교반 접합부의 인장성질에 미치는 접합조건의 영향

  • 윤태진 (부산대학교 하이브리드소재솔루션 국가핵심센터(NCRC)) ;
  • 김상주 (부산대학교 하이브리드소재솔루션 국가핵심센터(NCRC)) ;
  • 송상우 (한국기계연구원 부설 재료연구소) ;
  • 홍재근 (한국기계연구원 부설 재료연구소) ;
  • 강정윤 (부산대학교 하이브리드소재솔루션 국가핵심센터(NCRC))
  • Received : 2010.10.28
  • Accepted : 2011.04.14
  • Published : 2011.04.30
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Abstract

The scope of this investigation is to evaluate the effect of joining parameters on the microstructural features and mechanical properties of dissimilar aluminum alloys, 1mm-thickness fixing AA6K31 at the top position and fixing AA5J32 at the bottom position. The friction stir lap welds were studied under various welding conditions, rotation speed of 1000, 1250, 1500rpm and welding speed of 100, 300, 500, 700mm/min, respectively. Mechanical test has been investigated in terms of tensile shear test and hardness test. The results showed that three type nugget shapes such as onion ring, zigzag type, hooking with the void, have been observed with revolutionary pitch. All welding conditions fractured at the HAZ of top plate, A6K31 and also the strength compare with base metal of lap joints were low efficiency, 52~63%. The thickness of fractured position was decreased with the lower heat input conditions. The relationships were excellent due to linear between the effective thickness of fractured position and peak load. The fractured position was the interface between joint area and not joint area. Also the strength efficiency compared with base metal was lower than decreasing rate of thickness because the hardness was decreased at fractured position due to softened material.

Keywords

References

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