Comparison of the mechanical and corrosion behaviour between friction stir welded joints and MIG welded joints in 7020 aluminium alloy
- Perinet R. ,
- Goussain J.C. and
- Da Costa B.
- Perinet R. ,
- Goussain J.C. and
- Da Costa B.
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Description
The feasibility of friction stir welding (FSW) for welding aluminium alloy 7020, used for the construction of light armoured fighting vehicles, was investigated and compared with MIG welding. Two joint configurations were tested: butt welding in 100 and 30 mm thicknesses and butt lap welding in 14 and 20 mm penetration depth. A conventional tool and a self-retracting tool were used in FSW. The microstructure of the welds was examined. Tensile strength, hardness, bend performance and fatigue strength were determined. Exfoliation corrosion tests were carried out on MIG welds and FSW welds. Distortion was measured on butt joint test pieces and on beams welded by FSW. Residual stress was determined for both FSW and MIG welds. The mechanical properties of friction stir welds were higher than those of MIG welds and distortion was less.
5th International Symposium, 14-16 Sep 2004, Session 11B: Process Developments, Paper 02
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