Investigation of the Process of Laser Descaling of Mill Metal

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Abstract

The article investigates the process of laser cleaning of mill metal in exposure modes that do not lead to heating of the scale above its melting point. The possibility of destruction of mill scale due to thermochemical reactions in the scale and subsequent thermomechanical destruction has been identified and substantiated. The search and optimization of laser exposure modes has been carried out to increase the cleaning efficiency. For a more complete description of the laser cleaning process, attention is paid to the structure of mill scale; the features of its formation and probable phase transformations under the action of laser heating are described. An area of laser treatment modes in the range of exposure durations from 30 to 400 µs and power densities of from 50 to 750 kW/cm2 leading to thermomechanical scale destruction has been experimentally discovered. The process of laser descaling due to thermomechanical destruction is implemented using a continuous-wave fiber ytterbium laser with a maximum power of 2 kW.

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About the authors

Danila V. Zhurba

ITMO University; NPP VOLO LLC

Author for correspondence.
Email: photonics@technosphera.ru
ORCID iD: 0009-0001-6814-1737

postgraduate student, Junior Researcher

Russian Federation, St. Petersburg; St. Petersburg

Vladimir M. Zhurba

NPP VOLO LLC

Email: photonics@technosphera.ru

General Director

Russian Federation, St. Petersburg

Vadim P. Veiko

ITMO University

Email: photonics@technosphera.ru

Doctor of Technical Sciences, Professor, Chief Researcher

Russian Federation, St. Petersburg

Alexander E. Puisha

NPP VOLO LLC

Email: photonics@technosphera.ru

Candidate of Technical Sciences, Head of the Scientific and Technical Department

Russian Federation, St. Petersburg

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Supplementary files

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2. Fig. 1. Formation of the mill scale structure [27]

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3. Fig. 2. Transverse section of a mill sheet with a thickness of 5 mm, resin on top, below a dark layer of scale on the steel surface

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4. Fig.3. Schemes of a laser installation with a circular scanning system (left) and with a linear scanning system (right)

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5. Fig. 4.The result of laser exposure to mill scale: a) is the appearance of the scale surface; b) is the profile of the scale surface; c) removed scale particles

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6. Fig.5. Dependence of the threshold dose of scale removal on the dose of a single exposure with a duration of exposure of 150 microseconds

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7. Fig.6. Dependence of the threshold dose of scale destruction on the duration of exposure at a given power density, circular scanning system

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8. Fig.7. Dependence of the threshold dose of scale destruction on the duration of exposure at a given power density, linear scanning system

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Copyright (c) 2024 Zhurba D.V., Zhurba V.M., Veiko V.P., Puisha A.E.