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2017 year, number 5

Effect of Mg and Cu on Mechanical Properties of High-Strength Welded Joints of Aluminum Alloys Obtained by Laser Welding

B. D. Annin1, V. M. Fomin2, E. V. Karpov1, A. G. Malikov2, A. M. Orishich2
1Lavrent'ev Institute of Hydrodynamics, Siberian Branch, Russian Academy of Sciences, Novosibirsk, 630090 Russia
2Khristianovich Institute of Theoretical and Applied Mechanics, Siberian Branch, Russian Academy of Sciences, Novosibirsk, 630090 Russia
Keywords: лазерная сварка, алюминиевые сплавы, термообработка, пластическая деформация, прочность, микроструктура, фазовый состав, laser welding, aluminum alloys, thermal treatment, plastic strain, strength, microstructure, phase composition


Results of experimental investigations of welded joints of high-strength aluminum-lithium alloys of the Al-Cu-Li and Al-Mg-Li systems are reported. The welded joints are obtained by means of laser welding and are subjected to various types of processing for obtaining high-strength welded joints. A microstructural analysis is performed. The phase composition and mechanical properties of the welded joints before and after thermal treatment are studied. It is found that combined thermal treatment of the welded joint (annealing, quenching, and artificial aging) increases the joint strength, but appreciably decreases the alloy strength outside the region thermally affected by the welding process.