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 ㎜ under various travel and rotation speed conditions, the best performance was achieved with a travel speed of 61 ㎜/min. Using a probe diameter of 6 ㎜, rotation speeds of 170-210 rpm, and a travel speed of 15 ㎜/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 1100-2500rpm, many chips were produced due to excessive heat input. Heat effects were very evident on the bottom. For a travel speed of 15 ㎜/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.
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