Large load friction stir spot welding of steels
- Sato Y. ,
- Ueji R. ,
- Morisada Y. ,
- et al
- Sato Y. ,
- Ueji R. ,
- Morisada Y. and
- Fujii H.
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The large load friction stir spot welding (LL-FSSW) technique was applied to a low carbon steel sheet in order to achieve lap joints at a low temperature, and the microstructure and hardness of the joints were investigated. The composition of the grade studied was 0.04%C, 0.01%Si, 0.16%Mn. A cylindrical WC-based tool (diameter 12 mm) was used. LL-FSSW and conventional FSSW experiments were conducted under loads of 8000 or 2500 kg, rotational speeds of 20 or 1200 rpm and dwell times of 30 or 8 s, respectively. Cross-sectional microstructures were observed by optical microscopy and SEM with electron back scattering diffraction. Hardness was determined using the micro Vickers hardness test. Issues discussed include thermal profiles for different welding conditions and the relationship between grain size and hardness.
10th International Symposium, 20-22 May 2014, Session 3B: FSSW I, Paper 02
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