Formation of welded solid-state wire bonds in the manufacture of 12Kh18N10T steel porous mesh materials

Abstract

The experience of using turbine blade shells based on porous mesh materials in aerospace products and high-temperature gas turbines has shown that they are subject to destruction when under the influence of pressure fluctuations. So, first of all, fatigue failure occurs, in those permeable shells where there are no high-quality connections of structure-forming elements. It has been established that in diffusion welding and rolling welding, the strength of welded bonds increases with an increase in the process temperature, as well as in the vacuum depth and deformation time in diffusion welding. Research findings show that at strain rates of 10–2…1.0 s–1, the low quality of welded joints is explained by the high deformation resistance of microroughnesses on the contact surfaces of the wires and the low rate of diffusion mass transfer in the connection zone. The study establishes that under the conditions of diffusion and impact welding in vacuum, the formation of a solid-phase joint is possible on the entire surface of the macrocontact. At the same time, in percussion welding, the influence of the temperature value in the investigated interval on the quality of welded bonds is much lower than that for processes with lower loading rates. Practical recommendations are given for determining the optimal modes of wire mesh welding in the manufacture of porous mesh materials made of 12Kh18N10T steel.