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JWJ > Volume 30(6); 2012 > Article
Journal of KWJS 2012 December;30(6) :98-105.
Published online December 23, 2012.
doi:https://doi.org/10.5781/KWJS.2012.30.6.98
Effect of Welding Condition on Tensile Properties of Friction Stir Lap Joint of Dissimilar Al Alloy, KS5J32/AA6K31
Sang-Ju Kim*, Tae-Jin Yoon*, Sang-Woo Song**, Chung-Yun Kang*
*National Core Research Center, Pusan National University, Busan 609-735, Korea
**Korea Institute of Materials Science, Changwon 642-831, Korea
Correspondence: Chung-Yun Kang  Email: kangcy@pusan.ac.kr
  Published online December 23, 2012
ABSTRACT
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.
Keywords: Friction stir welding | Lap Joint | Dissimilar aluminum alloy | KS5J32 | AA6K31 | Tensile shear test
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