Journal
MATERIALS & DESIGN
Volume 47, Issue -, Pages 350-357Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.matdes.2012.12.007
Keywords
Spot friction stir welding; Aluminium; Steel; Interfacial microstructure
Categories
Funding
- Collaborative Research Based on Industrial Demand Heterogeneous Structure Control: Towards Innovative Development of Metallic Structural Materials
- Japan Science and Technology Agency (JST)
- Global COE Programs from the Ministry of Education, Sports, Culture, Science
- Japan Society for Promotion of Science
- Technology of Japan, ISIJ Research Promotion Grant
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The 6061-T6 Al alloy and mild steel plate with a thickness of 1 mm were successfully welded by the flat spot friction stir welding technique, which contains two steps during the entire welding process. The rotating tools with different probe lengths of 1.0, 1.3 and 1.5 mm were used in the first step, during which a conventional spot FSW was conducted above a round dent previously made on the back plate. However, sound Al/Fe welds with similar microstructure and mechanical properties can still be obtained after the second step, during which a probe-less rotating tool was used to flatten the weld surface. The sound welds have smooth surface without keyholes and other internal welding defects. No intermetallic compound layer but some areas with amorphous atomic configuration was formed along the Al/Fe joint interface due to the lower heat input. The shear tensile failure load can reach a maximum value of 3607 N and fracture through plug mode. The probe length has little effect on the weld properties, which indicates that the tool life can be significantly extended by this new spot welding technique. (C) 2012 Elsevier Ltd. All rights reserved.
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