Reference for citation: Altay Ye., Kuzivanov D. О., Rozhdestvensky D. А., Sannikov М. I., Stepanova К. А. Methods for filtering acoustic emission signals when monitoring defect formation in the process of direct laser growth of products. Journal of Instrument Engineering. 2023. Vol. 66, N 10. P. 852—868 (in Russian). DOI: 10.17586/0021-3454-2023-66-10-852-868.

Abstract. Results of acoustic emission monitoring of defect formation in products during direct laser growth are presented. The features of applying the acoustic emission method and results of processing recorded acoustic emission signals with the use of cascade polynomial digital filtering are considered. Results of experimental testing of the cascade filtration method for detecting internal structure defects such as cracks and pores are presented. Fragments of amplitude-time and frequency-time diagrams of acoustic emission signals recorded during the development of defects in the process of growing products are isolated. An assessment is made of the dependence of acoustic emission signals on defect formation parameters. A relationship between the acoustic emission signals parameters and applied laser radiation power is established, which characterizes the process of defect formation, as well as the nitrogen content in the heat-resistant alloy powder.

Keywords: acoustic emission, defect formation testing, additive manufacturing, direct laser growth, filtering, laser power, metallography, chromium-nickel alloy, signal

Acknowledgement: The research was carried out with the financial support of the Russian Ministry of Education and Science as part of the implementation of the program of the world-class Scientific Center in the direction of “Advanced Digital Technologies” of St. Petersburg State Marine Technical University (agreement dated April 20, 2022, No. 075-15-2022-312).

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