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observed. The presence of degradation processes in these areas was also confirmed
by metallographic studies.
A method for optimizing the technology of the metal abrasive blasting by the
frequency dependence of the surface acoustic Rayleigh wave velocity is developed.
Based on the research, it is shown that the main changes in the metal occurred in the
near-surface layer with a thickness of not more than 0,2 mm in the next treatment
modes: compressed air pressure 0,6 MPa, abrasive flow diameter 2 mm, distance
from the nozzle to the treatment surface 10 cm .
Developed technologies for assessing the metal condition were used in a small
state enterprise "Gazothermik" (Lviv) in the form of a method for evaluating the
results of abrasive blasting on the magnitude of the Rayleigh waves.
The proposed technologies, which are based on determining the speed of
Rayleigh waves of different frequencies, were implemented at the enterprise
"Techmal" (Lviv). They were used to determine the changes in the state of the metal
surface layers under the action of shot blasting in order to improve its strength
characteristics, as well as to optimize the technological regime.
Key words: diagnosing materials and structures, non-destructive testing, surface
acoustic Rayleigh waves, the Rayleigh waves propagation velocity, inhomogeneous
distribution of material properties by thickness, Rayleigh wave dispersion.
