Schwarzkopf K, Rothfelder R, Rasch M, Schmidt M (2023)
Publication Type: Journal article
Publication year: 2023
Original Authors: Karen Schwarzkopf, Richard Rothfelder, Michael Rasch, Michael Schmidt
Book Volume: 23
Pages Range: 4908
Issue: 10
DOI: 10.3390/s23104908
Spatial and temporal knowledge of temperature evolution is crucial in laser beam welding of low-melting materials such as aluminum alloys. Current temperature measurements are restricted to (i) one-dimensional temperature information (e.g., ratio-pyrometers), (ii) a priori knowledge of emissivity (e.g., thermography), and (iii) high-temperature regions (e.g., two-color-thermography). This study presents a ratio-based two-color-thermography system that enables acquiring spatially and temporally resolved temperature information for low-melting temperature ranges (<1200 K). The study demonstrates that temperature can be accurately determined despite variations in signal intensity and emissivity for objects emitting constant thermal radiation. The two-color-thermography system is further transferred into a commercial laser beam welding set-up. Experiments with varying process parameters are conducted, and the ability of the thermal imaging method to measure dynamic temperature behavior is assessed. Image artifacts presumably caused by internal reflections inside the optical beam path limit the direct application of the developed two-color-thermography system during dynamic temperature evolution.
APA:
Schwarzkopf, K., Rothfelder, R., Rasch, M., & Schmidt, M. (2023). Two-Color-Thermography for Temperature Determination in Laser Beam Welding of Low-Melting Materials. Sensors, 23, 4908. https://dx.doi.org/10.3390/s23104908
MLA:
Schwarzkopf, Karen, et al. "Two-Color-Thermography for Temperature Determination in Laser Beam Welding of Low-Melting Materials." Sensors 23 (2023): 4908.
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