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http://dx.doi.org/10.5781/KWJS.2011.29.2.072

The effects of Welding Conditions on Tensile Properties of Friction Stir Lap Welded of Dissimilar Al Alloy, A6K31/A5J32  

Yoon, Tae-Jin (National Core Research Center, Pusan National University)
Kim, Sang-Ju (National Core Research Center, Pusan National University)
Song, Sang-Woo (Korea Institute of materials Science)
Hong, Jae-Keun (Korea Institute of materials Science)
Kang, Chung-Yun (National Core Research Center, Pusan National University)
Publication Information
Journal of Welding and Joining / v.29, no.2, 2011 , pp. 72-79 More about this Journal
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
Friction stir welding; Lap joint; Dissimilar aluminum alloy; A6K31; A5J32; Tensile shear test;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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