Fatigue and corrosion properties of friction stir welded dissimilar aluminium alloys
- Mercado U.A. ,
- Ghidini T. ,
- Dalle Donne C. ,
- et al
- Mercado U.A. ,
- Ghidini T. ,
- Dalle Donne C. and
- Braun R.
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Description
The effects of post weld heat treatments on the mechanical properties and corrosion resistance of friction stir welded dissimilar aluminium alloy joints (2024/6056) were studied. Sheets of 4 mm thickness were first joined in heat treatments T3 for 2024A and T6 for 6056 with no post welding heat treatment (PWHT). Some joints were produced with 6056 in the T4 condition. After welding, the sheets were aged at 190 deg.C for 10 hours. Vickers hardness was determined. Tensile strength was assessed using a laser extensometer. Fatigue properties were assessed by S-N fatigue testing. Exfoliation corrosion tests, intergranular corrosion tests and stress corrosion cracking tests were conducted. The degree of corrosion was evaluated by visual inspection, optical microscopy and SEM. Post weld heat treatment increased hardness and static strength, but had no effect on fatigue strength.
5th International Symposium, 14-16 Sep 2004, Session 9A: Dissimilar Materials, Paper 02
Subjects
- Friction welding
- Welding
- Process
- Friction stir welding
- Microstructure
- Aluminium and Al alloys
- Nonferrous
- Material
- 2xxx Al series
- 6xxx Al series
- Dissimilar materials
- Properties
- Corrosion
- Strength
- Mechanical properties
- Fatigue strength
- Hardness
- Stress corrosion
- Heat treatment
- Ultimate tensile strength
- Defects
- Cracking
- PWHT
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