THE PUBLISHING HOUSE PROCEEDINGS OF THE ROMANIAN ACADEMY, Series A, OF THE ROMANIAN ACADEMY Volume 14, Number 1/2013, pp. 64–71 FRICTION STIR WELDING DEVELOPMENT OF ALUMINIUM ALLOYS FOR STRUCTURAL CONNECTIONS Ramona GABOR 1 , Jorge F. dos SANTOS 2 1 “Politehnica” University of Timisoara 2 Helmholtz-Zentrum Geesthacht E-mail: [email protected] Since its development in ’90, Friction Stir Welding (FSW) had known an important growth, especially for the hard to weld aluminium alloys. For these FSW has been shown to produce welds of high quality with no defects, reduced cost and lower environmental impact when compared to traditional fusion welding. The process parameters influence on the connection formation is related. An experimental program realized by HZG of FSW, applied on two aluminium alloys recommended to be used in the field of civil engineering is presented. Detailed characterisations are presented aiming to emphasize the performance of the process for the analysed alloys. Key words: Friction Stir Welding, aluminium alloy, lower environmental impact, connections, residual stress 1. INTRODUCTION Friction Stir Welding (FSW) is a solid-state welding process created and patented by The Welding Institute (TWI) in 1991. It is a relatively novel joining technology, which has caught the interest of many industrial sectors, including automotive, aeronautic and transportation due to its many advantages and clear industrial potential. The process adds new possibilities within component design and allows more economical and environmentally efficient use of materials [1–4]. x y z Welding direction Downward force Tool rotation Tool Advancing side Retracting side Weld region Nugget Fig. 1 – Schematic of the friction stir welding process. In FSW (Fig. 1) a cylindrical, shouldered tool with a profiled probe is rotated and slowly plunged into the joint line between two pieces of sheet or plate material, which are butted together. Frictional heat is generated between the wear resistant welding tool and the material of the work pieces [5]. The heat causes the materials to soften, without reaching melting point (typically in the range of 70–85% of the melting
FRICTION STIR WELDING DEVELOPMENT OF ALUMINIUM ALLOYS FOR STRUCTURAL CONNECTIONS
Jun 17, 2023
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