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Laser beam welding of steel-aluminum joints - influence of weld metal elastic-plastic properties on the distortions

  • Great attention is focused nowadays on laser welding of dissimilar steel-aluminum joints in overlap configuration in key-hole mode. It was found that elastic-plastic properties of the weld metal exhibit strong difference to those of the base alloys and can be defined as a function of aluminum content in the weld metal. A developed Finite-Element simulation model allows prediction of the aluminum content as a function of welding parameters and subsequently the elastic-plastic properties of the weld metal as a function of the determined content. The main goal of the present study is to show the impact of the weld metal properties on welding distortions and residual stresses. For that purpose, a sensitivity analysis of the thermomechanical model was performed, where the distortions and residual stresses were computed as a function of welding parameters and therefore as a function of corresponding weld metal properties. The analysis showed that the influence of the weld metal is essential, and its properties should be taken intoGreat attention is focused nowadays on laser welding of dissimilar steel-aluminum joints in overlap configuration in key-hole mode. It was found that elastic-plastic properties of the weld metal exhibit strong difference to those of the base alloys and can be defined as a function of aluminum content in the weld metal. A developed Finite-Element simulation model allows prediction of the aluminum content as a function of welding parameters and subsequently the elastic-plastic properties of the weld metal as a function of the determined content. The main goal of the present study is to show the impact of the weld metal properties on welding distortions and residual stresses. For that purpose, a sensitivity analysis of the thermomechanical model was performed, where the distortions and residual stresses were computed as a function of welding parameters and therefore as a function of corresponding weld metal properties. The analysis showed that the influence of the weld metal is essential, and its properties should be taken into consideration in the models for better prediction accuracy.show moreshow less

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Metadaten
Author: Anton Evdokimov, Ralf OssenbrinkORCiD, Nikolay DoynovORCiD, Vesselin MichailovORCiDGND
DOI:https://doi.org/10.3217/978-3-85125-615-4
ISBN:978-3-85125-615-4
Title of the source (English):Mathematical Modelling of Weld Phenomena 12 : selected peer reviewed papers from the 12th International Seminar Numerical Analysis of Weldability : September 23-26, 2018, Graz, Schloss Seggau - Austria
Publisher:Verlag der Technischen Universität Graz
Place of publication:Graz
Editor: Christof Sommitsch, Norbert Enzinger, Peter Mayr
Document Type:Conference publication peer-reviewed
Language:English
Year of publication:2019
First Page:431
Last Page:440
Faculty/Chair:Fakultät 3 Maschinenbau, Elektro- und Energiesysteme / FG Füge- und Schweißtechnik
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