A comparative research on bobbin tool and conventional friction stir welding of Al-Mg-Si alloy plates

Journal Article · Thu Nov 15 00:00:00 EST 2018 · Materials Characterization

DOI:https://doi.org/10.1016/J.MATCHAR.2018.08.027· OSTI ID:22805836

Yang, C. ^[1]; Xue, P.; Xiao, B. L. ^[1]; Wang, W.; Wang, K. S. ^[2]

---

1. Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang 110016 (China)
2. School of Metallurgical Engineering, Xi'an University of Architecture and Technology, Xi'an 710055 (China)

Highlights: • 6061-T4 Al plates were successfully welded by both BT-FSW and C-FSW processes. • A wide welding parameter window was achieved with bobbin tool. • BT-FSW joints showed good strength similar to that of C-FSW joints. • Proving that an Isothermal Dissolution Layer Theory also apply to BT-FSW - Abstract: In our work, Al-Mg-Si (6061Al -T4) plates of 6 mm thickness were subjected to bobbin tool friction stir welding (BT-FSW) and conventional friction stir welding (C-FSW) for comparison. How the welding process affects the microstructure and mechanical properties was investigated at various rotation rates and welding speeds. The results showed that butt FSW joints with high quality could be produced at the selected parameters. The joint strength rose with enhanced welding speed and was nearly independent of the rotation rate in both the welding processes. The strength of the joints produced with BT-FSW reached the same level as that of the C-FSW. The maximum joint strength of 229 MPa was 93% of the base material (BM), which is superior to the reported results of 60–80% for the T4 condition. The fracture position of most of the joints was in the heat-affected zone (HAZ), which is the lowest hardness zone.

• OSTI ID: 22805836
• Journal Information: Materials Characterization, Vol. 145; Other Information: Copyright (c) 2017 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); ISSN 1044-5803
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM COMPOUNDS
BACKSCATTERING
ELECTRON DIFFRACTION
FRICTION
HARDNESS
HEAT AFFECTED ZONE
LAYERS
MAGNESIUM COMPOUNDS
MICROSTRUCTURE
PRESSURE RANGE MEGA PA 100-1000
SCANNING ELECTRON MICROSCOPY
SILICON COMPOUNDS
TERNARY ALLOY SYSTEMS
THICKNESS
TRANSMISSION ELECTRON MICROSCOPY
WELDED JOINTS