Browse > Article
http://dx.doi.org/10.5781/KWJS.2009.27.6.017

Microstructures of Friction Stir Lap Weld in A5052-H112 Alloy  

Ko, Young-Bong (Dept. of Testing and Research Team, Korea Testing & Research Institute)
Lee, Joong-Hun (Dept. of technical research center, Hyundai-steel company)
Park, Kyeung-Chae (Dept. of Materials Sciences and Metallurgy, Kyungpook National University)
Publication Information
Journal of Welding and Joining / v.27, no.6, 2009 , pp. 17-24 More about this Journal
Abstract
The Friction Stir Welding(FSW) has mainly been used for making butt joints in Al alloys. Development of Friction Stir Lap Welding(FSLW) would expand the number of applications. Microstructure of FSLW in A5052-H112 alloy was investigated under varying rotation and welding speed. As the rotation speed was increased and the welding speed was decreased, a amount of heat was increased. As a result, bead interval was narrower, bead width are larger, and experimental bead interval was almost similar to theoretical bead interval. Typical microstructures of FSLW A5052-H112 alloy consist of three zones, including Stir Zone(SZ), Thermo-Mechanically Affected Zone(TMAZ) and Heat Affected Zone(HAZ). As a amount of heat was increased, average grain size was larger in three zones. Nevertheless, the aspect ratio was almost fixed for FSLW conditions. The misorientation of SZ, HAZ and TMAZ was examined. A large number of low angle grain boundaries, which were formed by severe plastic deformation, were showed in TMAZ as comparison with SZ and HAZ. Microhardness distribution was high in order of BM, SZ, TMAZ, and HAZ. The Micro-hardness distribution in HAZ, TMAZ of upper plate were lager than lower plate. Relationship between average grain size and microhardness was almost corresponded to Hall-Petch equation.
Keywords
FSLW; A5052-H112; EBSD; Grain size; Aspect ratio; Misorientation; Hall-Petch equation;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
연도 인용수 순위
1 W.M.Thomas et al : International Patent Application PCZT/GB92/02203 and GB Patent Application 9125978.8, UK Patent Office, London, (1991)
2 P.Colegrove et al : 3 Dimensional Flow and Thermal Modelling of the FrictionStir Welding Process, Proceedings of the Second International Symposium FSWGothenburg, 2000
3 $\Phi$.Frigaard et al : Modelling of the thermal and microstructural fields during friction stir welding of aluminum alloys, proceedings of the First International Symposium FSW Thousand Oaks. CA, 1999
4 Fomotake Hirata et al : Influence of friction stir welding parameters on grain size and formability in 5083 aluminum alloy, Material Science & Engineering A 456(2007), 344-349   DOI   ScienceOn
5 D. Fersini, A. Pirondi : Fatigue behaviour of Al2024-T3 friction stir welded lap joint Engineering Fracture Mechanics 74(2007), 468-480   DOI   ScienceOn
6 Rajiv S. Mirhra et al : Friction Stir Welding and Processing(1st edition) ASM International (2007), 42
7 Kuo-Tsung Huang et al : Vibration fracture resistance of 5052H112 aluminum alloy processed by cold rolling and friction stirring, Journal of Alloys and Compounds 470 (2009), 278–284   DOI   ScienceOn
8 N.J.Petch : J Iron and Steel Institute, 174(1953), 25-28
9 Heung-Ju Kim et al : Microstructures and mechanical properties of the friction stir welded dissimilar joint of AZ31B/A6061 Journal of KWS, 24-4 (2006), 290-294 (in Korean)   과학기술학회마을
10 E.O.Hall : Proc.Phys.Soc.B, 64(1951), 747-753   DOI   ScienceOn
11 Won-Bae Lee et al : Effects of welding parameters on friction stir weldability of 5052 Al alloy, Journal of KWS, 19-2 (2004), 265-272 (in Korean)
12 L. Cederqvist et al : Factors Affecting the Properties of Friction Stir Welded Aluminum Lap Joints, The Welding Journal Research Supplement 80 (2001), 281-287
13 O.T.Miding,et al : Industrialisation of the friction stir welding technology in panels production for the maritime sector, First International Symposium on FSW (1999)
14 Suk Hoon Kang et al : Microstructure Analysis for TMAZ of surface Friction Welded Al alloys, J. Kor. Inst. Met. & Master 43-11(2005), 714-717
15 Tomotake Hirata et al : Influence of friction stir welding parameters on grain size and formability in 5083 aluminium alloy, Materials Science and Engineering A 456(2007), 344-349   DOI   ScienceOn
16 Y.C.CHEN et al : Effect of the Surface State of Steel on the Microstructure and Mechanical Properties of Dissimilar Metal Lap Joints of Aluminum and Steel by Friction Stir Welding, Metallugical and Materials Transactions A 39A (2008), 1985-1992   DOI   ScienceOn
17 Jae-Cheul Park, et al: Evaluation of mechanical characteristic and investigation on optimum condition in friction stir processing for 5456-H116 Al alloy, J. Kor. Inst. Surf. Eng, 42-1(2009),13-20   과학기술학회마을   DOI   ScienceOn
18 M. Peel et al : Microstructure, mechanical properties and residual stresses as a function of welding speed in aluminium AA5083 friction stir welds, Acta aterialia 51(2003), 4791–4801   DOI   ScienceOn