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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 19    Special 1    September 2009

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Optimum condition by mechanical characteristic evaluation infriction stir welding for 5083-O Al alloy
Min-Su HAN1, Seung-Jun LEE1, Jae-Cheul PARK1, Seok-Cheol KO2, Yong-Bin WOO1, Seong-Jong KIM1

1. Division of Marine Engineering, Mokpo Maritime University, Mokpo City, Jeonnam 530-729, Korea;
2. Chungnam Regional Innovation Agency, Cheonan-si, Chungnam 330-816, Korea

Abstract:The mechanical characteristies for friction stir welding (FSW) of 5083-O Al alloy were evaluated. The results show that in FSW at 800 r/min and 124 mm/min, a weld defect is observed at the start point. However, the button shape at the end point is good and the stir zone has a soft appearance. At 267 mm/min, a void occurs at the button. A slight weld defect and rough stir zone are seen both at the start and end points at 342 mm/min. Moreover, at the bottom, a tunnel-type void is observed from an early stage to the end point, and at 1 800 r/min, a weld defect can be found from an early stage to the end point. These defects are rough with imperfect joining due to excessive rotation speed and high physical force. Weld fractures relative to rotational and travel speeds are observed at the stir zone. The optimum FSW conditions are a welding speed of 124 mm/min and a rotational speed of 800 r/min.

 

Key words: Al alloy; optimum condition; FSW; defect; stir zone

ISSN 1672-7029
CN 43-1423/U

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