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Experimental and numerical investigation on under-water friction stir welding of armour grade AA2519-T87 aluminium alloy

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Defence Technology（防务技术） 2016年第4期12卷 324-333页

作者： S.SREE SABARI S.MALARVIZHI V.BALASUBRAMANIAN G.MADUSUDHAN REDDY Centre for Materials Joining and Research (CEMAJOR) Department of Manufacturing Engineering Annamalai University Metal Joining Section Defense Metallurgical Research Laboratory (DMRL)

friction stir welding(FSW) is a promising welding process that can join age hardenable aluminium alloys with high joint efficiency. However,the thermal cycles experienced by the material to be joined during FSW resulted in the deterioration of mechanical properties due to the coarsening and dissolution of strengthening precipitates in the thermo-mechanical affected zone(TMAZ) and heat affected zone(HAZ). Under water friction stir welding(UWFSW) is a variant of FSW process which can maintain low heat input as well as constant heat input along the weld line. The heat conduction and dissipation during UWFSW controls the width of TMAZ and HAZ and also improves the joint properties. In this investigation, an attempt has been made to evaluate the mechanical properties and microstructural characteristics of AA2519-T87 aluminium alloy joints made by FSW and UWFSW processes. Finite element analysis has been used to estimate the temperature distribution and width of TMAZ region in both the joints and the results have been compared with experimental results and subsequently correlated with mechanical properties.? 2016 China Ordnance Society. Production and hosting by Elsevier B.V. All rights reserved.

关键词： Aluminium alloy friction stir welding underwater friction stir welding Mechanical properties Microstructural characteristics Finite element analysis

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