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Main Title: Investigation of the gap bridgeability at high-power laser hybrid welding of plasma-cut thick mild steels with AC magnetic support
Author(s): Üstündag, Ömer
Bakir, Nasim
Gumenyuk, Andrey
Rethmeier, Michael
Type: Article
Abstract: One of the challenges of the high-power hybrid laser welding of thick steels is the sensitivity of the process of the process to manufacturing tolerances. This usually leads to a time-consuming preparation of the welding edges, such as milling. The study deals with the influence of the edge quality of milled and plasma-cut steel made of S355J2 with a wall thickness of 20 mm on the laser hybrid welded seam quality. Furthermore, the gap bridgeability and the tolerances towards edge misalignment was investigated. An AC magnet was used as backing support to prevent sagging and positioned under the workpiece, to generate an upwards directed electromagnetic pressure. The profiles of the edges and the gap on the top and root side were measured using a digital camera. Single-pass laser hybrid welds of plasma-cut edges could be welded using a laser beam power of just 13.7 kW. A gap bridgeability up to 2 mm and misalignment of edges up to 2 mm could be achieved successful. Additionally, the independence of the cutting side and the welding side was shown, so that samples were welded to the opposite side to their cutting. For evaluation of internal defects or irregularities, X-ray images were carried out. Charpy impact strength tests were performed to determine the toughness of the welds.
Subject(s): gap bridgeability
high-power laser
mild steels
AC magnetic support
Issue Date: 2021
Date Available: 17-May-2022
Language Code: en
DDC Class: 530 Physik
Journal Title: Journal of Physics: Conference Series
Publisher: IOP
Volume: 2077
Issue: 1
Article Number: 012007
Publisher DOI: 10.1088/1742-6596/2077/1/012007
EISSN: 1742-6596
ISSN: 1742-6588
TU Affiliation(s): Fak. 5 Verkehrs- und Maschinensysteme » Inst. Werkzeugmaschinen und Fabrikbetrieb » FG Fügetechnik
Appears in Collections:Technische Universität Berlin » Publications

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