Influence of the welding temperature and the welding speed on the mechanical properties of friction stir welds in EN AW-2219-T87

20th Chemnitz Seminar on Materials Engineering - 20. Werkstofftechnisches Kolloquium

Bachmann, A.^1 ; Krutzlinger, M.^1 ; Zaeh, M.F.^1

Institute for Machine Tools and Industrial Management, Technical University of Munich, Boltzmannstrasse 15, Garching

85748, Germany^1

关键词: Aerospace structure;    Friction stir welding(FSW);    High strength aluminum alloys;    Lack of penetration;    Stringent requirement;    Ultimate tensile strength;    Uniaxial tensile test;    Welding temperatures;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/373/1/012016/pdf
DOI  :  10.1088/1757-899X/373/1/012016

来源: IOP

【 摘 要 】

Friction Stir Welding (FSW) is an innovative joining technique, which has proven to produce high quality joints in high strength aluminum alloys. Consequently, it is commonly used to manufacture lightweight aerospace structures with stringent requirements. For these structures, it is necessary to ensure a high ultimate tensile strength (UTS). Various studies have reported that the UTS is significantly influenced by the welding parameters. Samples welded with different parameter sets showed a considerably different UTS, despite being free from detectable welding defects (e.g. tunnel defect, voids, or lack of penetration). Based on the observations in the literature, a hypothesis was posed. The welding temperature along with the welding speed determine the UTS of the weld. This study aims to prove this hypothesis experimentally by using temperature-controlled FSW to join plates of EN AW-2219-T87 in butt joint configuration. The welded samples were examined using visual inspection, metallography, X-ray imaging, and uniaxial tensile tests. Finally, a statistical analysis was conducted. Hereby, the hypothesis was confirmed.