Abstract
In microlap welding, a real-time welding quality monitoring system is crucial to the identification of low strength joints caused by the unreliable contact between two layers of stainless metal sheets. In this study, a multispacing configured microphone array filter was designed and applied to a sound-based quality monitoring system for laser microlap welding, and the filter’s performance was evaluated to improve the reliability of the developed monitoring system when collected sound signals are contaminated by the noises generated around a welding site. In the experimental setup, joint strength was modulated by controlling the clam** conditions of the fixture and changing the welding location. The results indicated that noises contaminated the signals obtained from single microphones and reduced classification rates by up to 25% when time domain features were adopted. Through the application of the proposed microphone array in the developed monitoring system, the classification rate of weld quality can be improved to a level resembling that observed when artificial noise is not applied to the system.
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Acknowledgements
This study was supported by the Microware Precision Co. Ltd. for the implementation of experiments in production line.
Funding
This research received partially financial support from the Ministry of Science and Technology, Taiwan. Grant number: MOST 104–2221-E-005–019 and MOST 110–2218-E-002–038.
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Ming-Chyuan Lu contributes to the conceptualization, methodology, signal analysis, and writing. Ming-Jong Chen contributes to the development, the conduction of experiments, and the data process and analysis.
Pei-Ning Wang contributes to the development, the conduction of experiments, and the data process and analysis
Shean-Juinn Chiou contributes to the resources acquisition and writing.
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Chen, MZ., Lu, MC., Wang, PN. et al. Experimental study of quality monitoring system integrated with a microphone array in laser microlap welding. Int J Adv Manuf Technol 121, 2305–2316 (2022). https://doi.org/10.1007/s00170-022-09459-8
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DOI: https://doi.org/10.1007/s00170-022-09459-8