Optical method of on-line temperature monitoring on the melt surface in laser metal deposition technology

Y. N. Zavalov; A. V. Dubrov; V. D. Dubrov

doi:10.1117/12.2527636

21 June 2019 Optical method of on-line temperature monitoring on the melt surface in laser metal deposition technology

Y. N. Zavalov, A. V. Dubrov, V. D. Dubrov

Proceedings Volume 11056, Optical Measurement Systems for Industrial Inspection XI; 1105633 (2019) https://doi.org/10.1117/12.2527636
Event: SPIE Optical Metrology, 2019, Munich, Germany

Abstract

Experimental results of on-line monitoring of temperature on the surface of a melt of stainless steel 304 in laser metal deposition technology with an inclined position of the sensor relative to the laser beam are presented. The additive synthesis setup uses the heating of a coaxial flow of a gas-powder mixture in the field of focused laser radiation from a fiber-optic ytterbium laser with a continuous power up to 400 W. To control the temperature on the surface of the melt, a multichannel pyrometer in the SWIR brightness pyrometer mode was used. The spatial resolution of the optical system was approximately 100 μm, and the speed of the sensors was at least 5 kHz. A multi-wave optical diagnostics method is proposed, including monitoring of laser radiation reflected from the melt surface. The features of optical diagnostics of the surface of the melt in the technology of laser metal deposition are given. The results of measuring the temporal temperature behavior as a function of the scanning speed and the distance from the substrate to the laser focus are presented. The spectrum of temperature pulsations T* during the formation of the track is calculated. It is shown that as the scanning speed increases, the pulsation spectrum of T* shifts toward higher frequencies in proportion to the speed. It is also shown that the temperature T* and the mass productivity of track formation increase with a change in the distance from the substrate to the laser focus from 10 to 11 mm, and also with an increase in the powder mass flow rate from 8.4 g/min to 15.6 g/min

Citation Download Citation

Y. N. Zavalov, A. V. Dubrov, and V. D. Dubrov "Optical method of on-line temperature monitoring on the melt surface in laser metal deposition technology", Proc. SPIE 11056, Optical Measurement Systems for Industrial Inspection XI, 1105633 (21 June 2019); https://doi.org/10.1117/12.2527636

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