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Main Title: Assessment of thermal cycles by combining thermo-fluid dynamics and heat conduction in keyhole mode welding processes
Author(s): Artinov, Antoni
Karkhin, Victor
Khomich, Pavel
Bachmann, Marcel
Rethmeier, Michael
Type: Article
Language Code: en
Abstract: A numerical framework for simulation of the steady-state thermal behaviour in keyhole mode welding has been developed. It is based on the equivalent heat source concept and consists of two parts: computational thermo-fluid dynamics and heat conduction. The solution of the thermo-fluid dynamics problem by the finite element method for a bounded domain results in a weld pool interface geometry being the input data for a subsequent heat conduction problem solved for a workpiece by a proposed boundary element method. The main physical phenomena, such as keyhole shape, thermo-capillary and natural convection and temperature-dependent material properties are taken into consideration. The developed technique is applied to complete-penetration keyhole laser beam welding of a 15 mm thick low-alloyed steel plate at a welding speed of 33 mm s-1 and a laser power of 18 kW. The fluid flow of the molten metal has a strong influence on the weld pool geometry. The thermo-capillary convection is responsible for an increase of the weld pool size near the plate surfaces and a bulge formation near the plate middle plane. The numerical and experimental molten pools, cross-sectional weld dimensions and thermal cycles of the heat affected zone are in close agreement.
Issue Date: 7-Jul-2019
Date Available: 10-Sep-2020
DDC Class: 621 Angewandte Physik
Subject(s): welding process simulation
thermo-fluid dynamics
heat conduction
laser beam welding
finite element method
boundary element method
Sponsor/Funder: DFG, 411393804, Experimentelle und numerische Untersuchung der Entstehungsmechanismen des Bulgings und dessen Einfluss auf die Bildung von Mittelrippendefekten beim Hochleistungslaserstrahlschweißen niedriglegierter Stähle hoher Blechdicke
Journal Title: International Journal of Thermal Sciences
Publisher: Elsevier
Publisher Place: Amsterdam [u.a.]
Volume: 145
Article Number: 105981
Publisher DOI: 10.1016/j.ijthermalsci.2019.105981
EISSN: 1778-4166
ISSN: 1290-0729
Appears in Collections:FG Fügetechnik » Publications

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