In-Situ Monitoring of Laser Additive Manufacturing for Al7075 Alloy Using Emission Spectroscopy and Plume Imaging

Most aluminum alloys, especially the 7xxx series, are incompatible with laser additive manufacturing due to many factors. In-situ process monitoring technology offers an excellent opportunity for understanding and control, which improves component quality repeatability of AM. In this study, emission spectroscopy plume imaging were utilized monitor understand laser-directed energy deposition Al7075 alloy. Characteristics plasma analyzed using spectra image signals. Emission lines Al I, Mg Cr I observed in signals demonstrated that primary elements evaporated excited during AM forming a plume. The intensity increased significantly as power increasing. periodic fluctuation was revealed images, indicating powers inputted into target surface unstable interaction. elemental evaporation inconsistent input main challenges potentially monitored by Methods signal feature extraction images developed. Experimental results showed spectral energy, average baseline intensity, area practical rough monitoring. Correlations between features key printing parameters developed, demonstrating response scanning speed. This investigation potentials in-situ AM, making progress towards intelligent manufacturing.