Fatigue behaviour of friction stir spot welded joints in Al-Mg-Si alloy
- Uematsu Y. ,
- Tokaji K. and
- Murata S.
- Uematsu Y. ,
- Tokaji K. and
- Murata S.
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Description
Fatigue tests were performed using lap-shear specimens of friction stir spot welded Al, 0.8%Mg, 1%Si alloys. Sheet specimens (thickness 2 mm) were subjected to PWHT of solution treatment and/or ageing. Weld zone microstructure was observed by SEM. Fatigue tests were conducted using an electrohydraulic fatigue testing machine at a frequency of 10 Hz and hardness distribution was measured by means of a micro-Vickers hardness tester. Fatigue strength was evaluated and fracture mechanisms were clarified on the basis of weld zone microstructural observations. Issues discussed include the dependence of fatigue fracture morphology on load level, debonding and opening deformation under high load, and fatigue crack initiation at the nugget edge.
6th International Symposium, 10-13 Oct 2006, Session 3A: Fatigue I, Paper 03
Subjects
- Friction welding
- Welding
- Process
- Aluminium and Al alloys
- Nonferrous
- Material
- 6xxx Al series
- Friction stir spot welding
- Cracking
- Defects
- Fatigue cracks
- Strength
- Mechanical properties
- Properties
- Fatigue strength
- Microstructure
- Weld zone
- Weld
- Dynamically recrystallised zone
- Hardness
- Fracture
- Heat treatment
- PWHT
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