Development of ultrasound assisted friction stir welding for Al/Mg-hybrid-joints: process analysis, comparison of microstructural, mechanical and corrosive characteristics
- Thoma M. ,
- Wagner G. ,
- Wolter B. ,
- et al
- Thoma M. ,
- Wagner G. ,
- Wolter B. ,
- Conrad C. ,
- Strass B. ,
- Furbeth W. and
- Benfer S.
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Description
An ultrasound assisted friction stir welding (UA-FSW) technique was employed to fabricate butt joints in similar Al/Al and dissimilar Al/Mg sheets, and the influence of ultrasonic oscillations on weld zone microstructure and mechanical properties was investigated. The material systems comprised wrought alloys such as AW 5454 or AZ80 and cast alloys such as AC-48000 or AZ91. Nugget microstructures in conventional FSW and UA-FSW joints were compared and nondestructive tests were carried out to detect welding defects. Strain controlled tensile tests were undertaken to determine quasi static behaviour. Stepwise load increase tests and constant amplitude tests were performed to predict fatigue lifetimes. Spatially resolved and integral studies were conducted to assess the effect of ultrasound on corrosion behaviour. Issues discussed include optimisation of process parameters and the influence of ultrasound on the nugget onion structure and intermetallic layer formation.
11th International Symposium, 17-19 May 2016, Session 6B: Techniques II, Paper 03
Subjects
- Aluminium and Al alloys
- Nonferrous
- Material
- 5xxx Al series
- Magnesium and Mg alloys
- Dissimilar materials
- Friction welding
- Welding
- Process
- Friction stir welding
- Process conditions
- Microstructure
- Properties
- Corrosion
- Strength
- Mechanical properties
- Ultimate tensile strength
- Fatigue
- Fatigue life
- Defects
- Weld zone
- Weld
- Dynamically recrystallised zone
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