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Microstructure evaluation of dissimilar AA2024 and AA7050 aluminum joints made by corner stationary-shoulder friction stir welding
University of Miskolc, Miskolc (HUN).
Budapest University of Technology and Economics, Budapest (HUN).
University West, Department of Engineering Science, Division of Welding Technology. (PTW)
TWI Ltd., Cambridge (GBR).
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2022 (English)In: Welding in the World, ISSN 0043-2288, E-ISSN 1878-6669Article in journal (Refereed) Published
Abstract [en]

Fillet welds made by the corner stationary-shoulder friction stir welding process between AA7050-T7451 and AA2024-T4 sheets were characterized using different metallographic techniques and mechanical testing. Robotic welds of an aircraft’s skin-to-internal stiffeners were examined using Barker’s electrolytic and Keller’s etching techniques and correlated with electron backscattered diffraction results and energy-dispersive microprobe analysis. The composition and grain orientation maps and material flow lines demonstrated excellent weld quality in spite of the apparent inhomogeneities in the stir zone where mechanical mixing was complete. Welded joint efficiencies were in the 85-92% of the base metals and were acceptable in terms of resistance to crack initiation and propagation and corrosion resistance, even with softening of the heat-affected zones. It was concluded that several optical and electron microscopy techniques are needed to characterize these dissimilar aluminum welds fully and that post-weld mechanical and thermal treatments could even further improve their quality.

Place, publisher, year, edition, pages
SPRINGER HEIDELBERG , 2022.
Keywords [en]
Friction stir welding (FSW); Dissimilar aluminum joints; Stationary shoulder friction stir welding (SS-FSW); Corner stationary shoulder friction stir welding (CSS-FSW)
National Category
Production Engineering, Human Work Science and Ergonomics Computational Mathematics Applied Mechanics
Research subject
Production Technology
Identifiers
URN: urn:nbn:se:hv:diva-18676DOI: 10.1007/s40194-022-01321-5ISI: 000803853800001OAI: oai:DiVA.org:hv-18676DiVA, id: diva2:1678621
Available from: 2022-06-29 Created: 2022-06-29 Last updated: 2022-06-29

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Adonyi, Yoni

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