Investigations of the Absorption Front in High-Speed Laser Processing Up to 600 m/min
Abstract
:1. Introduction
2. Materials and Methods
3. Results
3.1. Reference Process
3.2. Characterization by Means of the Half-Section Setup
3.3. Further Process Observations
4. Process Models and Discussion
5. Conclusions
- The resultant loss of mass clarified the different process regimes that dominated in the range of processing speeds from 1 to 10 m/s. There was an increase by a factor of more than 10 for the resultant loss of mass at 10 m/s compared to that found at 1 m/s. It could be observed that the loss of mass started to increase significantly at processing speeds of 7 m/s. Examinations on metallographic cross-sections showed differences in the amount of remaining melt at the walls and bottom of the resulting kerfs for high processing speeds.
- The resulting inclination angle increased nearly linear with the increased processing speed. Under the applied process parameters, an angle of about 14° was produced at 1 m/s, while the absorption front was inclined at about 70° for processing speeds of 10 m/s. The correlation with the resulting loss of mass showed significant increases at inclination angles of about 60°.
- At processing speeds between 4 and 6 m/s, the preferred orientation of single spatter detachments was observed to be lateral and frontward relative to the scanning direction, with velocities comparable to the processing speed. The orientation of the spatter detachment occurring at processing speeds beyond 7 m/s was characterized as being primarily against the scanning direction. At the same time, a much higher amount of finer spatter was observed to occur at a processing speed of 7 m/s, when the absorption front was inclined at about 60°. As such, the formation of long trajectories for a single spatter demonstrated its immense acceleration out of the processing zone.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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Cr | Ni | C | Si | Mn | Fe |
---|---|---|---|---|---|
17.00–19.00 | 8.00–10.00 | ≤0.07 | ≤1.00 | ≤2.00 | Bal. |
Wavelength (nm) | Focal Diameter 1 (µm) | BPP (mm·mrad) | M2 | Rayleigh Length (mm) | Focal Length (mm) | Max. Scan Speed (m/s) |
---|---|---|---|---|---|---|
1070 | 16.5 | 0.38 | 1.12 | 0.18 | 135 | 10 |
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Hellwig, P.; Schricker, K.; Bergmann, J.P. Investigations of the Absorption Front in High-Speed Laser Processing Up to 600 m/min. Appl. Sci. 2021, 11, 4015. https://doi.org/10.3390/app11094015
Hellwig P, Schricker K, Bergmann JP. Investigations of the Absorption Front in High-Speed Laser Processing Up to 600 m/min. Applied Sciences. 2021; 11(9):4015. https://doi.org/10.3390/app11094015
Chicago/Turabian StyleHellwig, Peter, Klaus Schricker, and Jean Pierre Bergmann. 2021. "Investigations of the Absorption Front in High-Speed Laser Processing Up to 600 m/min" Applied Sciences 11, no. 9: 4015. https://doi.org/10.3390/app11094015
APA StyleHellwig, P., Schricker, K., & Bergmann, J. P. (2021). Investigations of the Absorption Front in High-Speed Laser Processing Up to 600 m/min. Applied Sciences, 11(9), 4015. https://doi.org/10.3390/app11094015