AA7075 bit for repairing AA2219 keyhole by filling friction stir welding |
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| Affiliation: | 1. State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001, People’s Republic of China;2. Csr Zhuzhou Electric Locomotive Co., Ltd., Zhuzhou 412001, People’s Republic of China;1. Department of Mechanical Engineering, Indian Institute of Science, Bangalore 560012, India;2. Department of Mechanical Engineering, National Institute of Technology Karnataka, Surathkal, Mangalore 575025, India;1. Univ. Lyon, ENISE, LTDS, UMR 5513 CNRS, 58 rue Jean Parot, F-42023 Saint-Etienne cedex 2, France;2. Ecole des Mines de Saint-Etienne, LGF UMR 5307 CNRS, 158 Cours Fauriel, F-42023 Saint-Etienne, France;3. Ecole de Technologie Superieure, 1100 Rue Notre-Dame Ouest, Montreal, QC H3C 1K3, Canada;1. Department of Mechanical Engineering, Nelson Mandela Metropolitan University, Port Elizabeth, South Africa;2. Department of Civil & Structural Engineering, University of Sheffield, Sheffield, UK;3. Department of Engineering, University of Ferrara, Ferrara, Italy;4. School of Marine Science & Engineering, University of Plymouth, Plymouth, UK;1. University of Texas of the Permian Basin, Mechanical Engineering, 4901 East University, Odessa, TX 79762, USA;2. The University of Texas at El Paso, Department of Metallurgical and Materials Engineering, 500 West University Avenue, El Paso, TX 79968, USA;3. NASA Johnson Space Center, Materials and Processes Branch, Houston, TX 77058, USA |
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| Abstract: | In the present study, 7.8 mm thick AA2219 rolled plates were successfully filling friction stir welded (FFSW) without keyhole using a semi-consumable tool. The influences of the bit’s geometric parameters and the plunge speed on the joint’s mechanical properties were investigated. Microstructure of the joint, especially at the interface, was observed. The results revealed that the AA7075 bit’s employment was able to decrease the shedding bit material effectively. During tensile tests, the maximum ultimate tensile strength (UTS) and elongation of the joint were 179.6 MPa and 13.7%, equivalent to 96.6% and 99% of the original defect-free friction stir welding (FSW) joint, respectively. The defect-free FFSW joints were produced at lower plunge speeds, and the fracture locations were at the softened region within the heat affected zone (HAZ) adjacent to the thermo-mechanically affected zone (TMAZ) on the retreating side. With increasing the plunge speed, the fracture location was more mainly dependent on the interface strength instead of the hardness distribution. |
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| Keywords: | Filling friction stir welding Aluminum bit Keyhole Interface Mechanical property |
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