There are many reasons for influencing the laser beam induced weld pool. The manipulation of the dynamics, the solidification, the resulting grain size, and in the end, as a result of the aforementioned influencing, the mechanical characteristics of the weld is the aim of different attempts to gain an impact on the melt. Aluminum alloys tend to porosity formation because of different solubility of hydrogen in solid and liquid states. For reliable welds, the porosity has to be limited. An ultrasound excitation is one possibility to allow a fast degassing, especially for the considered round bars, for which no welding through is possible for geometric reasons. The presented research shows the influence of the ultrasonic amplitude on the microstructure of laser beam welded round bars of the aluminum alloy AA6082-T6. Furthermore, the position of the weld pool in the vibration distribution is varied and the influence evaluated. Metallographic cross sections show in analyses the resulting weld characteristic and the microstructure of the weld metal. The grain size and the grain orientation are evaluated for the different ultrasound parameters. Additionally, the summed porosity area is compared to acquire knowledge about the correlation between ultrasound excitation (with regard to vibration amplitude and position in the vibration distribution) and pore formation.
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May 2019
Research Article|
April 09 2019
Influence of ultrasonic amplitude and position in the vibration distribution on the microstructure of a laser beam welded aluminum alloy
Sarah Nothdurft;
Sarah Nothdurft
1
Laser Zentrum Hannover e.V.
, Hollerithallee 8, Hannover 30419, Germany
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Hendrik Ohrdes;
Hendrik Ohrdes
2
Institut für Dynamik und Schwingungen
, Appelstraße 11, Hannover 30167, Germany
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Jens Twiefel;
Jens Twiefel
2
Institut für Dynamik und Schwingungen
, Appelstraße 11, Hannover 30167, Germany
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Jörg Wallaschek;
Jörg Wallaschek
2
Institut für Dynamik und Schwingungen
, Appelstraße 11, Hannover 30167, Germany
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Maximilian Mildebrath;
Maximilian Mildebrath
3
Institut für Werkstoffkunde
, An der Universität 2, Garbsen 30823, Germany
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Hans Jürgen Maier;
Hans Jürgen Maier
3
Institut für Werkstoffkunde
, An der Universität 2, Garbsen 30823, Germany
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Thomas Hassel;
Thomas Hassel
3
Institut für Werkstoffkunde
, An der Universität 2, Garbsen 30823, Germany
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Ludger Overmeyer;
Ludger Overmeyer
1
Laser Zentrum Hannover e.V.
, Hollerithallee 8, Hannover 30419, Germany
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Stefan Kaierle
Stefan Kaierle
1
Laser Zentrum Hannover e.V.
, Hollerithallee 8, Hannover 30419, Germany
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®
Note: This paper is part of the Special Collection: Proceedings of the International Congress of Applications of Lasers & Electro-Optics (ICALEO 2018).
J. Laser Appl. 31, 022402 (2019)
Article history
Received:
March 14 2019
Accepted:
March 14 2019
Citation
Sarah Nothdurft, Hendrik Ohrdes, Jens Twiefel, Jörg Wallaschek, Maximilian Mildebrath, Hans Jürgen Maier, Thomas Hassel, Ludger Overmeyer, Stefan Kaierle; Influence of ultrasonic amplitude and position in the vibration distribution on the microstructure of a laser beam welded aluminum alloy. J. Laser Appl. 1 May 2019; 31 (2): 022402. https://doi.org/10.2351/1.5096100
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