Friction Stir Welding Tools and Techniques for Welding Aluminum Extrusions
W. M. Thomas, I. M. Norris, E. D. Nicholas and D. G. Staines, TWI
Track: VALUE-ADDED PROCESSES - Welding
ABSTRACT --- Invented at TWI in 1991, the friction stir welding (FSW) joining and material
processing method has made notable technical and commercial progress. Its impact
commercially is undisputed. The design of the tool and the motion used is the key to
the successful application of the FSW process. The welds are made below the melting
point in the solid-phase. The excellent mechanical properties and low distortion usually
achieved by FSW are attributed to the comparatively low heat input, the lack of melting
and the hot worked fine microstructure within the weld region. Friction stir welding is
providing significant advantage to the aluminum extrusion industry. Many international
extruder companies routinely use friction stir welding as an integral part of their
manufacturing process to add value to their products. This paper describes some
further developments of the technique for the aluminum extrusion industry.
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