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Interface Behavior and Impact Properties of Dissimilar Al/Steel Keyhole-Free FSSW Joints

School of Materials Science and Engineering, Lanzhou University of Technology, Lanzhou 730050, China
School of Materials Science and Engineering, Tongji University, Shanghai 201804, China
Aeronautical Key Laboratory for Welding and Joining Technologies, AVIC Manufacturing Technology Institute AECC, Beijing 100024, China
Author to whom correspondence should be addressed.
Metals 2019, 9(6), 691;
Received: 28 April 2019 / Revised: 11 June 2019 / Accepted: 13 June 2019 / Published: 18 June 2019
(This article belongs to the Special Issue Characterization of Welded Joints)
PDF [8687 KB, uploaded 18 June 2019]


This work systematically investigates the interface behavior and impact properties of the keyhole-free friction stir spot welding (FSSW) of a dissimilar metal AA6082-T4 Al alloy and DP600 galvanized steel. The keyhole is eliminated by pin retraction technology. The welding process is in accordance with the welding temperature curve and the maximum temperature of the periphery of the shoulder, measured at about 500 °C. The transition layers were formed at the interface, in which the Al, Fe, and Zn elements form an inhomogeneous diffusion. A cloud cluster-like mechanical mixing of the Al and steel components is formed in the stirring zone. The impact toughness of the specimen with a welding parameter of 1000 rpm is the best. To a certain extent, the factors affecting the impact energy are not the maximum impact load but the maximum impact deformation. The maximum impact deformation directly reflects the post-crack propagation energy, which significantly affects its impact toughness. In addition, the impact fracture showed a mixed ductile and brittle fracture mode with a brittle–ductile transition zone. Most of the impact energy was absorbed by the ductile fracture. View Full-Text
Keywords: FSSW; dissimilar metals; interface behavior; impact properties FSSW; dissimilar metals; interface behavior; impact properties

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Zhang, Z.; Yu, Y.; Zhao, H.; Wang, X. Interface Behavior and Impact Properties of Dissimilar Al/Steel Keyhole-Free FSSW Joints. Metals 2019, 9, 691.

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