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2021 №05 (06) DOI of Article
2021 №05 (08)

Automatic Welding 2021 #05
Avtomaticheskaya Svarka (Automatic Welding), #5, 2021, pp. 46-50

Analysis of the properties of electron beam welded joints of aluminium lithium alloy latest generation

Mir. Sahul1, Mar. Sahul2, Ľ. Čaplovič2, M. Marônek1, I. Klochkov3, S. Motrunich3

1Slovak University of Technology in Bratislava, Faculty of Materials Science and Technology in Trnava, Department of Welding and Joining of Materials, J. Bottu 25, 917 24 Trnava, Slovakia. E-mail: miroslav.sahul@stuba.sk
2Slovak University of Technology in Bratislava, Faculty of Materials Science and Technology in Trnava, Institute of Materials Science, J. Bottu 25, 917 24 Trnava, Slovakia
3E.O. Paton Electric Welding Institute of the NAS of Ukraine, 11 Kazymyr Malevych Str., 03150, Kyiv, Ukraine. E-mail: office@paton.kiev.ua

Electron beam welded joints made on AW2099 aluminium lithium alloy with the thickness of 4 mm were analysed. The third generation of aluminium lithium alloys was developed to improve the drawbacks of the second one. Various electron beam welding parameters (beam current, welding speed) were tested. Accelerating voltage was constant, i.e., 55 kV. Defect free welded joints were produced under optimized welding parameters. Weld metal microstructure and welded joints mechanical properties were investigated. Microstructure of weld metal matrix consists of α-aluminium solid solution. Inter-dendrite areas were enriched in alloying elements due to segregation. Narrow equiaxed zone was observed at the location close to the fusion boundary being characteristic for welded joints made on aluminium lithium alloys. The character of the grains changed in the direction towards weld metal centre to columnar dendritic and equiaxed dendritic. Microhardness values reduction in the weld metal was observed which is associated to the dissolution of strengthening precipitates. 22 Ref., 1 Tabl., 9 Fig.
Keywords: AW2099 aluminium lithium alloy, electron beam welding, equiaxed zone, scanning electron microscopy, drop of microhardness



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