The process of femtosecond laser welding of lithium aluminosilicate glass ceramics was studied. The influence of laser pulse energy (1…10 µJ), scanning speed, and focusing depth on the geometrical characteristics and structural changes in the material was investigated. Using optical and scanning electron microscopy as well as Raman spectroscopy, it was shown that exposure to pulses with an energy of 2 µJ and above induces local amorphization of the glass ceramic structure. It was found that an increase in energy leads to an increase in the weld height from 130 to 240 µm, while variations in scanning speed within the studied range do not have a significant effect. Shear strength tests were carried out on welded joints made with circular and spiral trajectories. It was demonstrated that the use of a spiral trajectory allows the average joint strength to be increased almost threefold (up to 19.5 MPa) compared to the circular trajectory (7 MPa). The obtained results show the promise of using a spiral trajectory for creating reliable welded joints of glass ceramics.
Sergey S. Fedotov – PhD in Chemistry, Associate Professor, Department of Chemical Technology of Glass and Glass-Ceramics, Mendeleev University of Chemical Technology of Russia (MUCTR), Moscow, Russia
Alexey S. Lipatiev – PhD in Chemistry, Associate Professor, Department of Chemical Technology of Glass and Glass-Ceramics, Mendeleev University of Chemical Technology of Russia (MUCTR), Moscow, Russia
Tatiana O. Lipateva – PhD in chemistry, Associate Professor, Department of Chemical Technology of Glass and Glass-Ceramics, Mendeleev University of Chemical Technology of Russia (MUCTR), Moscow, Russia
Rasim R. Saifutyarov – PhD in Chemistry, head of the Shared Research Facility (IHATS), deputy head of the Analytical Testing Laboratory, Kurchatov Complex of Physicochemical Technologies, National Research Centre “Kurchatov Institute”, Moscow, Russia
Vitaliy I. Savinkov – Ph.D. in Technology, assistant, Department of Chemical Technology of Glass and Glass-Ceramics, Mendeleev University of Chemical Technology of Russia (MUCTR), Moscow, Russia
Kirill E. Tregubov – postgraduate student, Department of Chemical Technology of Glass and Glass-Ceramics, Mendeleev University of Chemical Technology of Russia (MUCTR), Moscow, Russia
Kristina V. Shirshova – student, Department of Chemical Technology of Glass and Glass-Ceramics, Mendeleev University of Chemical Technology of Russia (MUCTR), Moscow, Russia
Nina R. Zapotylko – Candidate of Technical Sciences, head of the Site, Scientific and Production Complex for Laser Gyroscopy, Polyus Research Institute of M. F. Stelmakh JSC, Moscow, Russia
Vladimir N. Sigaev – DSc. in Chemistry, Professor, head of the International Center of Laser Technologies, head of the P. D. Sarkisov International Laboratory of Functional Glass-based Materials, Head of the Department of Chemical Technology of Glass and Glass-Ceramics, Mendeleev University of Chemical Technology of Russia (MUCTR), Moscow, Russia
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DOI: 10.14489/glc.2026.11.pp.003-008
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