Laser Welding of Dissimilar Materials Based on the BT20 Titanium Alloy and B-1461 Aluminum Alloy
A. G. Malikov1, A. M. Orishich1, I. E. Vitoshkin1, E. V. Karpov2, A. I. Ancharov3,4
1Khristianovich Institute of Theoretical and Applied Mechanics, Siberian Branch, Russian Academy of Sciences, Novosibirsk, 630090, Russia
2Lavrent'yev Institute of Hydrodynamics, Russian Academy of Sciences, Novosibirsk, 630090, Russia
3Institute of Solid State Chemistry and Mechanochemistry, Siberian Branch, Russian Academy of Sciences, Novosibirsk, 630128, Russia
4Budker Institute of Nuclear Physics, Siberian Branch, Russian Academy of Sciences, Novosibirsk, 630090, Russia
Keywords: лазерная сварка, разнородные материалы, титановый сплав, алюминиево-литиевый сплав, прочность, структурно-фазовый состав, laser welding, dissimilar materials, titanium alloy, aluminum-lithium alloy, strength, structural-phase composition
Abstract
This paper describes results of an experimental study of strength characteristics and a microstructure of a permanent joint of dissimilar materials (VT20 titanium alloy and B-1461 aluminum alloy), obtained by laser butt welding. Optical and electron microscopy, the results of X-ray spectral and phase analysis, and the transmission diffraction method with the help of synchrotron radiation are all used to investigate the properties of a welded joint. It is shown that the displacement of laser radiation relative to the contact surface of dissimilar materials significantly changes the microstructure and phase composition of the intermetallic interlayer formed between the materials welded, thereby affecting the strength of dissimilar welded joints.
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