Sponsor
We acknowledge financial and technical support provided by the Korea Institute of Industrial Technology (No. EH-22-060). Also, we are pleased to acknowledge support from the National Research Foundation of Korea (NRF) funded by the Korea government (MSIP) (Grant No. 2021R1A2C3010731).
Published In
Journal of Laser Applications
Document Type
Post-Print
Publication Date
9-2021
Subjects
Tomography, Nanostructured materials, Nanotechnology
Abstract
In the laser welding of thin Al/Cu sheets, proper penetration depth and wide interface bead width ensure stable joint strength and low electrical conductance. In this study, we proposed deep learning models to predict the penetration depth. The inputs for the prediction models were 500 Hz-sampled low-cost charge-coupled device (CCD) camera images and 100 Hz-sampled spectral signals. The output was the penetration depth estimated from the keyhole depth measured coaxially using optical coherence tomography. A unisensor model using a CCD image and a multisensor model using a CCD image and the spectrometer signal were proposed in this study. The input and output of the data points were resampled at 100 and 500 Hz, respectively. The 500 Hz models showed better performance than the 100 Hz models, and the multisensor models more accurately predicted the penetration depth than the unisensor models. The most accurate model had a coefficient of determination (R2) of 0.999985 and mean absolute error of 0.02035 mm in the model test. It was demonstrated that low-cost sensors can successfully predict the penetration depth during Al/Cu laser welding.
Rights
© 2023 AIP Publishing LLC. Article copyright remains as specified within the article.
Locate the Document
DOI
10.2351/7.0000767
Persistent Identifier
https://archives.pdx.edu/ds/psu/39063
Citation Details
Published as: Kang, S., Kang, M., Jang, Y. H., & Kim, C. (2022). Deep learning-based penetration depth prediction in Al/Cu laser welding using spectrometer signal and CCD image. Journal of Laser Applications, 34(4), 042035.
Description
This is the author’s version of a work that was accepted for publication in the Journal of Laser Applications. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Journal of Laser Applications.