| 2001 №07 (02) | 2001 №07 (04) |
The Paton Welding Journal, 2001, #7, 11-15 pages
Influence of welding process on fracture resistance of joints in aluminium-lithium alloys 1420 and 1460
T.M. Labur, Andr.A. Bondarev, A.V. Lozovskaya, V.S. Mashin, A.G. Poklyatsky
E.O. Paton Electric Welding Institute of the NASU 11 Kazymyr Malevych Str., 03150, Kyiv, Ukraine.Abstract
A dependence is established of fracture resistance of welded joints in Al--Li alloys 1420 and 1460 on the welding process (consumable or non-consumable electrode, electron beam). It is shown that different thermal conditions of welding lead to different degrees of HAZ metal softening. Application of a highly-concentrated heat source in electron beam welding, ensures a higher resistance to crack initiation and propagation. The metal of the fusion boundary of the weld with the base metal has the lowest fracture resistance of all the studied zones of welded joints, irrespective of the joining process.
Keywords: fusion welding, Al-Li alloys, heat input, weld metal, fusion zone, HAZ, nominal breaking stress, specific work of crack propagation, critical stress intensity factor, J-integral, comparative analysis
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