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http://dx.doi.org/10.7837/kosomes.2012.18.3.273

The Welding Surface and Mechanical Characteristics in Friction Stir Welding for 5456-H116 Alloy  

Kim, Seong-Jong (Faculty of Marine Engineering, Mokpo Maritime University)
Han, Min-Su (Faculty of Marine Engineering, Mokpo Maritime University)
Jang, Seok-Ki (Faculty of Marine Engineering, Mokpo Maritime University)
Publication Information
Journal of the Korean Society of Marine Environment & Safety / v.18, no.3, 2012 , pp. 273-278 More about this Journal
Abstract
The use of Al alloys instead of fiber-reinforced plastic(FRP) in ship construction has increased because of the advantages of Al-alloy ships, including high speed, increased load capacity, and ease of recycling. This paper describes the effects of probe diameter on the optimum friction stir welding conditions of 5456-H116 alloy for leisure ship, measured by a tensile test. In friction stir welding using a probe diameter of 5 mm under various travel and rotation speed conditions, the best performance was achieved with a travel speed of 61 mm/min. Using a probe diameter of 6 mm, rotation speeds of 170-210 rpm, and a travel speed of 15 mm/min produced a rough surface and voids because of insufficient heat input produced by the low rotation speed. At 500-800 rpm, chips were observed, although there were no voids, and the weld surface was excellent. However, at 1100-2500 rpm, many chips were produced due to excessive heat input. Heat effects were very evident on the bottom. For a travel speed of 15 mm/min, heat input caused by friction increased as the rotation speed increased. The mechanical characteristics were degraded by accelerated softening due to increasing heat input.
Keywords
Al alloy ships; Friction stir welding; Tensile test; Rotation speed; Mechanical characteristics;
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Times Cited By KSCI : 2  (Citation Analysis)
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