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http://dx.doi.org/10.5781/KWJS.2010.28.1.034

Joining Ability and Mechanical Properties of Friction Stir Lap Welded A5052-H112 Alloy  

Ko, Young-Bong (Dept. of Testing and Research Team, Korea Testing & Research Institute)
Choi, Jun-Woong (Dept. of Ship Technology Research Division, Research Institute of Medium & Small Shipbuilding)
Park, Kyeung-Chae (Dept. of Materials Sciences and Metallurgy, Kyungpook National University)
Publication Information
Journal of Welding and Joining / v.28, no.1, 2010 , pp. 34-40 More about this Journal
Abstract
In Friction Stir Lap Welding(FSLW), the movement of material within the weld was more important than the microstructure, due to the interface present between the sheets. Thus, The soundness of free defect, Effective Sheet Thickness(EST) and width of joint were most important factor of mechanical properties. Specimens by lap joint types that were 'A-type' and 'R-type' were made in this study. A-type tensile specimen was loaded at advancing side and R-type tensile specimen was loaded at retreating side. Macro-, micro-structural observation and mechanical properties of FSLW A5052-H112 alloy ware investigated under varying rotating and welding speed. The results were as follows: Material hook formed decreasing after sharply increasing was appeared at the end interface of joint area in advanced side, and material hook formed decreasing after smoothly increasing was observed at that in retreated side. Tensile load had no relation with defects. As rotating speed was higher, tensile strength was increasing and EST was decreasing regardless of joint types. joint efficiency was over 70%. In a result of fractography, fracture in A-type was partially occurred by dimple in SZ, and fracture in R-type was generally occurred by dimple in HAZ.
Keywords
FSLW(Friction Stir Lap Welding); Joint type; Material hook; EST(Effective Sheet Thickness); Soundness;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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