Preliminary laser treatment of materials for diffusion bonding in space and aviation technologies.

The paper investigates the possibility of improving the technology of diffusion welding, which can be used both for joining dissimilar materials for the manufacture of complex devices in the aerospace industry on the ground, and for repair and design in outer space. A laser treatment by nanosecond laser pulses of the ultraviolet range was carried out for surface modification of industry alloys (CrNi55CuВZn, steel AISI 316, Cu–Cr bronze) used in space technology due to high values of thermal and electrical conductivity. It was shown that the preliminary laser treatment leads to an improvement in the properties of the weld: an increase in tensile strength by more than 10%, and tensile strain by more than 20% for certain joints of materials. Also, laser pre-processing can improve the productivity of the welding process, in particular, reduce the temperature and shorten the welding time. • Preliminary laser treatment of alloy samples for diffusion welding was studied. • A method of direct micro- and nanostructuring was used for surface modification. • Laser treatment improves mechanical properties of welded joints used in space and aviation technologies. • Tensile strength increases by more than 10% for joints with treated samples. • Laser pre-processing can reduce the welding temperature and shorten the welding time. [ABSTRACT FROM AUTHOR]