Details
| Original language | English |
|---|---|
| Article number | 022402 |
| Number of pages | 7 |
| Journal | Journal of laser applications |
| Volume | 31 |
| Issue number | 2 |
| Publication status | Published - 9 Apr 2019 |
Abstract
ASJC Scopus subject areas
- Materials Science(all)
- Electronic, Optical and Magnetic Materials
- Physics and Astronomy(all)
- Atomic and Molecular Physics, and Optics
- Engineering(all)
- Biomedical Engineering
- Physics and Astronomy(all)
- Instrumentation
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In: Journal of laser applications, Vol. 31, No. 2, 022402, 09.04.2019.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Influence of ultrasonic amplitude and position in the vibration distribution on the microstructure of a laser beam welded aluminum alloy
AU - Nothdurft, Sarah
AU - Ohrdes, Hendrik
AU - Twiefel, Jens
AU - Wallaschek, Jörg
AU - Mildebrath, Maximilian
AU - Maier, Hans Jürgen
AU - Hassel, Thomas
AU - Overmeyer, Ludger
AU - Kaierle, Stefan
N1 - Funding information: The results presented in this paper were obtained from the Collaborative Research Centre 1153 “Process chain to produce hybrid high performance components with Tailored Forming” in subproject A3. The authors would like to thank the German Research Foundation (DFG) for the financial and organizational support of this project.
PY - 2019/4/9
Y1 - 2019/4/9
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=85064216385&partnerID=8YFLogxK
U2 - 10.2351/1.5096100
DO - 10.2351/1.5096100
M3 - Article
AN - SCOPUS:85064216385
VL - 31
JO - Journal of laser applications
JF - Journal of laser applications
SN - 1042-346X
IS - 2
M1 - 022402
ER -