Laser welding is one of the most promising methods in comparison with other methods of welding dissimilar materials. This method does not require the use of additional materials, special edge processing, and also has a high welding speed. The aim of the work was to study the phase composition and morphology of various zones of the welded joint between alloys based on aluminum and titanium. . The phase composition and morphology of the welds were studied at the experimental station of the 4th SI channel from the VEPP-3 storage ring. We used the technique of shooting in the light. A thin beam (0.1 mm across the width of the seam and 0.4 mm along the length of the seam) of monochromatic synchrotron radiation passes through the welded joint and gives a two-dimensional diffraction pattern recorded by a two-coordinate flat detector. The use of synchrotron radiation made it possible to identify the fundamental laws of the formation of the micro and nano structure of the weld, to determine the main phase composition. Scanning with a thin SR beam for the first time investigated the structural-phase composition of laser welded joints of dissimilar materials in different zones of the weld from titanium to aluminum at different displacements of the laser beam. This allowed us to choose a welding mode in which the strength of a heterogeneous weld increased by 2.5 times.
This method, due to the small diameter of the focused radiation, makes it possible to obtain a thin diffusion zone in which intermetallic compounds are formed, vary the width of this zone due to the movement of laser radiation, and thereby change the mechanical characteristics of the resulting dissimilar welded joints.
The work on optimizing welding conditions and studying the microstructure was carried out in the framework of the Program of Fundamental Scientific Research of the State Academies of Sciences for 2013-2020 (project AAAA-A17-117030610122-6). The work was carried out using the equipment of the Mechanics and Processing Center (ITAM SB RAS). Diffraction studies were carried out using the infrastructure of the Siberian Center for Synchrotron and Terahertz Radiation as part of the state task of the Institute of Chemical Technology and Technology of the SB RAS (project No. AAAA-A17-117030310280-6).