Author(s)

P.J. Haagensen, O.T. Midling & M. Ranes

Abstract

Fatigue performance of friction stir butt welds in a 6000 series aluminum alloy PJ. Haagensen*, O.T. Midling^, M Ranes' "Faculty of Civil Engineering, The Norwegian Institute of Technology, University ofTrondheim, Rich. Birkelandsvei Ic, N-7034 Trondheim, Norway ^Norsk Hydro Aluminum, R&D Centre, Karm0y, Norway ^SINTEF Production Engineering, Trondheim, Norway ABSTRACT Friction stir welding is a novel solid state joining process for making low cost, energy efficient butt welds in aluminum alloy extrusions. The plate edges are clamped against a backing plate and the material is plastically deformed and stirred by a rotating tool moving along the joint line. The resulting weld bead is flush with the surface and exhibits little distortion. The material in the weld and heat affected zone (HAZ) has a fine-grained microstructure and a high tensile strength compared with welds produced by conventional arc welding methods. The present investigation was undertaken to determine the fatigue

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