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Influence of mill scale on oxygen laser cutting processes
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Product and Production Development.ORCID iD: 0000-0002-3060-5831
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Product and Production Development.ORCID iD: 0000-0003-0194-9018
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Product and Production Development.ORCID iD: 0000-0003-4265-1541
SSAB Europe Oy, Finland.
2021 (English)In: IOP Conference Series: Materials Science and Engineering, Institute of Physics (IOP), 2021, Vol. 1135, article id 012008Conference paper, Published paper (Refereed)
Abstract [en]

Mill scale formed on the surface of hot rolled steels consists of magnetite (Fe3O4), hematite (Fe2O3) and wustite (FeO) layers, which can protect the steels from corrosion and other atmospheric effects. Existence of mill scale on the specimens' surface has shown to be able to decrease the cut edge quality. Since the mechanism behind influence of mill scale on the laser cutting process is unknown, this work performs direct observation of oxygen laser cutting processes on specimens with and without removed mill scale layers. Oxygen laser cutting processes were carried out using Ytterbium fibre laser 1070 nm along the edge of 20-mm-thick-steel specimens which were attached to a borosilicate glass. Focal point of the laser beam was positioned to be 0.7 mm below the specimens' surface. A high speed imaging system was arranged to face the glass, recording the cut front and kerf dynamics during cutting processes. It was found that cut front inclination angle increase when the mill scale was removed from the specimens' surface. This implies that mill scale on the specimens' surface seem to contribute in increasing the exothermal energy during laser cutting processes.

Place, publisher, year, edition, pages
Institute of Physics (IOP), 2021. Vol. 1135, article id 012008
Series
IOP Conference Series: Materials Science and Engineering, ISSN 1757-8981, E-ISSN 1757-899X
National Category
Manufacturing, Surface and Joining Technology
Research subject
Manufacturing Systems Engineering
Identifiers
URN: urn:nbn:se:ltu:diva-90022DOI: 10.1088/1757-899X/1135/1/012008ISI: 000766307500008OAI: oai:DiVA.org:ltu-90022DiVA, id: diva2:1648675
Conference
18th Nordic Laser Materials Processing Conference (18th NOLAMP), Luleå, Sweden, January 18-20, 2022
Funder
Vinnova, 2019-00781_VINNOVAAvailable from: 2022-03-31 Created: 2022-03-31 Last updated: 2022-04-11Bibliographically approved

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Dewi, Handika SandraVolpp, JoergFrostevarg, Jan

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