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STUDY OF RELATION BETWEEN PIN TOOL GEOMETRY WITH FORMATION OF WORMHOLE IN FSW OF ALUMINUM AA5083

By Amir Hakim Saniman

Abstract

Friction Stir Welding has developed as alternative machinery for joining metallic alloys that can be consider as almost impossible to join with conventional techniques. FSW process is employed for joining low melting point metal in several industries such as aerospace, rail, automotive and marine industries. Presence of cavity defect or wormhole is a common occurrence in Friction Stir Welding that been closely linked to weaken the joint mechanical properties. Formation of cavity at stirred area or nugget is a result of poor flow control of plasticize welding material, hence understanding movement of plasticize material is crucial to dictate the problem. Variables such as pin tool geometry, tilting angle and also direction of pin tool rotation are believed to impact the flow of melted workpiece. Nevertheless, frictional contact conditions at the tool–workpiece interface, the resulting microstructure, and the genesis of the cyclic variation in process responses are among the issues that need elucidation from critical experimentations. This project proposes pin tool design to reduce size of wormhole spawn from FSW process. Manipulative variables that were tested were pin tool geometry, and pin tool material. The experiment was conducted at room temperature on controlled test-piece dimension of Aluminum 5083. Parts of mechanical properties of the welded samples and also microstructure formation will be presented to conclude the study. Keywords: Friction Stir Welding, wormhole size, pin tool geometry, pin tool material, aluminium 508

Topics: TJ Mechanical engineering and machinery
Publisher: 'Whiting & Birch, Ltd.'
Year: 2015
OAI identifier: oai:generic.eprints.org:16215/core10784
Provided by: UTPedia

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