Mechanism of spot welding between automotive aluminium alloy and Zn coated steel by multi-step friction spot joining
- Yasui T. ,
- Matsumura H. ,
- Tsubaki M. ,
- et al
- Yasui T. ,
- Matsumura H. ,
- Tsubaki M. ,
- Fukumoto M. ,
- Matsumura Y. ,
- Fujii K. ,
- Kon T. and
- Kondo Y.
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Description
The friction stir spot welding of automotive aluminium alloy and Zn-coated steel was investigated. Welds were made in 6000 series AlMgSi alloys (1.2 mm thickness) and galvanised steel (1.1 mm thickness) using a multi-step friction stir spot process. The multi step process used different pressure at different times. Various process parameters (rotation speed, welding time and joining pressure) were investigated. The temperature, material flow and microstructure of the weld were examined during each stage of welding using scanning electron microscopy and energy-dispersive x-ray spectrometry. Tensile shear and cross tensile strength were also determined. The feasibility of three-step friction stir welding for removing aluminium from the tool surface and zinc from the weld interface is discussed.
8th International Symposium, 18-20 May 2010, Session 10B: Automotive Spot 2, Paper 04
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