Avtomaticheskaya Svarka (Automatic Welding), # 7, 2018, pp. 31-36
Possibilities of manufacturing three-layer welded honeycomb
panels from aluminium alloys
L.V. Petrushynets, Yu.V. Falchenko, V.E. Fedorchuk, V.S. Shynkarenko
E.O.Paton Electric Welding Institute of the NAS of Ukraine, 11 Kazimir Malevich Str., 03150, Kyiv, Ukraine.
Three-layer honeycomb panels are widely applied in aircraft construction, ship-building, construction and others industries. In terms of design they consist of honeycomb core and two skins. At relatively small weight, these structures are characterized by high strength values, sound- and heat-insulating properties. The main problem in manufacturing a three-layer structure is welding the upper and lower skins to end faces of the honeycomb core. The work presents the results of development of the technology of manufacturing three-layer honeycomb panels of 150×150 mm size from aluminium alloys. The honeycomb core from AD1 aluminium alloy 0.150 mm thick was produced by joining the corrugated strips into blocks by spot welding. Flatness of end faces of the honeycomb core was achieved by grinding. The structure rigidity was ensured by filling the cells with colophony. Joining of the core to the skins from AMg2 alloy 1.0 mm thick was performed by diffusion welding in vacuum. The process was conducted in a fixture consisting of the lower and upper flanges and bushing. The flanges provided skin pressing to the honeycomb core end faces over the entire contact area, and the bushing allowed homogenizing the temperature in the item and controlling the extent of its deformation during welding. 8 Ref., 1 Tabl., 6 Fig.
three-layer honeycomb panel, sheet aluminium alloys, spot welding, diffusion welding in vacuum
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