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Main Title: High Power Laser Beam Welding of Thick-walled Ferromagnetic Steels with Electromagnetic Weld Pool Support
Author(s): Fritzsche, André
Avilov, Vjaceslav
Gumenyuk, Andrey
Hilgenberg, Kai
Rethmeier, Michael
Type: Article
Language Code: en
Abstract: The development of modern high power laser systems allows single pass welding of thick-walled components with minimal distortion. Besides the high demands on the joint preparation, the hydrostatic pressure in the melt pool increases with higher plate thicknesses. Reaching or exceeding the Laplace pressure, drop-out or melt sagging are caused. A contactless electromagnetic weld support system was used for laser beam welding of thick ferromagnetic steel plates compensating these effects. An oscillating magnetic field induces eddy currents in the weld pool which generate Lorentz forces counteracting the gravity forces. Hysteresis effects of ferromagnetic steels are considered as well as the loss of magnetization in zones exceeding the Curie temperature. These phenomena reduce the effective Lorentz forces within the weld pool. The successful compensation of the hydrostatic pressure was demonstrated on up to 20 mm thick plates of duplex and mild steel by a variation of the electromagnetic power level and the oscillation frequency.
Issue Date: 2016
Date Available: 19-Apr-2018
DDC Class: 530 Physik
Subject(s): laser beam welding
thick-walled steel
ferromagnetic steel
weld pool support
Journal Title: Physics Procedia
Publisher: Elsevier BV
Publisher Place: Amsterdam [u.a.]
Volume: 83
Publisher DOI: 10.1016/j.phpro.2016.08.038
Page Start: 362
Page End: 372
ISSN: 1875-3892
Appears in Collections:FG Verfahren und Technologien für hochbeanspruchte Schweißverbindungen » Publications

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