Dependence of the microstructure, residual stresses and texture of AA 6013 friction stir welds on the welding proces

Author:

Lima E. B. F.1,Wegener J.1,Donne C. Dalle2,Goerigk G.3,Wroblewski T.4,Buslaps T.5,Pyzalla A. R.1,Reimers W.1

Affiliation:

1. Institute for Materials Science and Technology, Technical University , Berlin , Germany

2. Deutsches Zentrum für Luft- und Raumfahrt DLR, Institut für Werkstoff-Forschung , Köln , Germany

3. Forschungszentrum Jülich GmbH , Jülich , Germany

4. Hamburg Synchrotron Radiation Laboratory – HASYLAB at the German Electron Synchrotron – DESY , Hamburg , Germany

5. European Synchrotron Radiation Facility ESRF , Grenoble , France

Abstract

Abstract The microstructure, the residual stresses and the texture of friction stir welds of 4 mm thick samples made of a 6013 Al –Mg– Si –Cu alloy in T4 state were investigated in order to study the influence of the friction stir welding process on the material and in order to determine the influence of different welding parameters. The results of the investigations reveal the influence of the process parameters (welding speed, tool diameter and rotational speed) on the weld properties such as the microstructure, the precipitation state, the hardness, the texture and the residual stresses. The formation of the residual stresses and their distribution is explained based on an existing, simple thermal model for the friction stir welding and on a classical model for the formation of the residual stresses in conventional fusion welding.

Publisher

Walter de Gruyter GmbH

Subject

Materials Chemistry,Metals and Alloys,Physical and Theoretical Chemistry,Condensed Matter Physics

Reference16 articles.

1. L. Dorn: Materialwiss. u. Werkstofftechnik. 29 (1998) 412.

2. D. Graham Austral. Welding J. 44 (1999) 28.

3. E. Göran: Schweiss- & Prüftechnik 9 (1999) 135.

4. R. Pedwell et al., in: Proc. 1st Int. Symp. on Friction Stir Welding, June 14 –16, 1999, Thousand Oaks, CA. The Welding Institute, Cambridge, UK (CD-ROM).

5. S. Kalle: Metallurgia 64 (4) (1997) 119.

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