Analysis of Photodiode Monitoring in Laser Cutting
Abstract
:Featured Application
Abstract
1. Introduction
2. Experimental Section
2.1. Laser Cutting System
2.2. Design of Experiments
3. Results and Discussion
4. Conclusions and Future Work
- The measured intensity of the VIS signal was associated with the vapor plume formation during the cutting process, whereas the IR signal was related to the temperatures reached.
- For the VIS and the IR monitoring signals, it was found that they were independent of the process parameters as long as the cutting quality was good. In contrast, the mean level increased as the cutting quality became worse. Therefore, their values can be useful for monitoring defective cuts online.
- This investigation revealed failures in defect detection for the thinner aluminum plate in the VIS spectrum, attributed to the low signal value generated by the characteristics of the case. In contrast, stainless steel displayed signal saturation with good cut quality, usually typical of cut losses.
- Gain system adjustment was revealed as the key factor for success in the detection of cutting defects. Too low a gain prevent detection of defects, whereas gains that were too high saturated the monitoring signal, generating false results.
Author Contributions
Funding
Conflicts of Interest
References
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Cutting Parameters | Al | SS | ||
---|---|---|---|---|
Thickness [mm] | 5 | 10 | 10 | 10 |
Gas type | N2 | N2 | O2 | N2 |
Power [kW] | 5 | 5 | 5 | 5 |
Velocity [mm/min] | 7000 | 2400 | 680 | 1200 |
Gas pressure [bar] | 15 | 15 | 10.5 | 12 |
Focal [mm] | −1.1 | −2.4 | −3 | −7.2 |
Standoff [mm] | 0.6 | 0.6 | 0.6₋ | 0.6 |
Frequency [Hz] | 5000 | 5000 | 5000 | 5000 |
Duty minimum [%] | 100 | 100 | 100 | 100 |
Duty maximum [%] | 100 | 100 | 100 | 100 |
Nozzle diameter [mm] | 2.5 | 3 | 2.5 | 3 |
Cutting parameters | Al | SS | ||
---|---|---|---|---|
Thickness [mm] | 5 | 10 | 10 | 10 |
Gas type | N2 | N2 | O2 | N2 |
Power [kW] | 4–5 | 4.3–5 | 4.2–5 | 4–5 |
Velocity [mm/min] | 4500–7500 | 2000–2600 | 500–900 | 600–1400 |
Gas pressure [bar] | 9–17 | 13–19 | 6–12 | 8–16 |
Focal [mm] | −0.6–−1.6 | −2–−3.2 | −2–−4 | −0.6–−7.8 |
Monitoring Signal Mean Levels (V) | |||||
---|---|---|---|---|---|
Case | VIS Gain | IR Gain | |||
1 | 2 | 3 | 1 | 2 | |
Al, N2, 5 mm, 5 kW | 0.1 | 0.1 | 0.15 | 0.1 | 0.7 |
Al, N2, 10 mm, 5 kW | 0.1 | 0.1 | 0.6 | 0.1 | 0.4 |
Al, O2, 10 mm, 5 kW | 0.1 | 0.1 | 0.4 | 0.25 | 1.3 |
SS, N2, 10 mm, 5 kW | 0.1 | 0.25 | 1.5 | 3 | 10 |
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Garcia, S.M.; Ramos, J.; Arrizubieta, J.I.; Figueras, J. Analysis of Photodiode Monitoring in Laser Cutting. Appl. Sci. 2020, 10, 6556. https://doi.org/10.3390/app10186556
Garcia SM, Ramos J, Arrizubieta JI, Figueras J. Analysis of Photodiode Monitoring in Laser Cutting. Applied Sciences. 2020; 10(18):6556. https://doi.org/10.3390/app10186556
Chicago/Turabian StyleGarcia, Sonia M., Joana Ramos, Jon Iñaki Arrizubieta, and Jordi Figueras. 2020. "Analysis of Photodiode Monitoring in Laser Cutting" Applied Sciences 10, no. 18: 6556. https://doi.org/10.3390/app10186556
APA StyleGarcia, S. M., Ramos, J., Arrizubieta, J. I., & Figueras, J. (2020). Analysis of Photodiode Monitoring in Laser Cutting. Applied Sciences, 10(18), 6556. https://doi.org/10.3390/app10186556