TWI

Various dissimilar butt joints were fabricated between 2017A-T451 (Al, 4.14%Cu, 0.72%Mg), 6082-T6 (Al, 1.03%Mg, 0.92%Si) and AlSi9Mg (Al, 8.6%Si, 0.31%Mg) aluminium alloys by friction stir welding using a high pin tool rotational speed (1400 or 1800 rpm), a low shoulder rotational speed (350 rpm) and a travel speed of 900 or 1120 mm/min, and the microstructure and mechanical properties of the weldments were investigated. Welding was carried out parallel to the rolling direction of 2017A and 6082 alloys. Macrostructures, microstructures and fracture surfaces were observed by optical microscopy, SEM, TEM and electron backscattering diffraction. Mechanical properties were characterised by tensile tests.

11th International Symposium, 17-19 May 2016, Session 9A: Techniques III, Paper 02