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- W2895888968 abstract "Sound is produced during laser spot welding. In the present experiments, the sound is detected by a microphone for monitoring YAG laser spot welding of stainless steel sheets of 0.3 and 1.0mm in thickness. Laser beam conditions are the energy of 2J and pulse duration of 5ms; the welding is done by a single pulse. To analyze the time dependence of the sound variation, the short-time fast Fourier transform analysis method (SFFTA) is adopted. The difference between the sounds in full penetration welding for thin sheet and in partial penetration welding for thick sheet is studied. Though great difference cannot be observed in the sounds detected by the microphone, the clear difference can be observed in SFFTA. The lap spot welding is successfully carried out for the gap less than 0.05mm; the results obtained by SFFTA are similar to the result for the bead on plate welding of a thick plate. On the other hand, the welding cannot be made in the gap greater than 0.1mm; the result obtained by SFFTA is similar to the result for the bead on plate welding of a thin sheet. The results show the possibility of monitoring the quality of the lap welding by sound analysis for production systems.Sound is produced during laser spot welding. In the present experiments, the sound is detected by a microphone for monitoring YAG laser spot welding of stainless steel sheets of 0.3 and 1.0mm in thickness. Laser beam conditions are the energy of 2J and pulse duration of 5ms; the welding is done by a single pulse. To analyze the time dependence of the sound variation, the short-time fast Fourier transform analysis method (SFFTA) is adopted. The difference between the sounds in full penetration welding for thin sheet and in partial penetration welding for thick sheet is studied. Though great difference cannot be observed in the sounds detected by the microphone, the clear difference can be observed in SFFTA. The lap spot welding is successfully carried out for the gap less than 0.05mm; the results obtained by SFFTA are similar to the result for the bead on plate welding of a thick plate. On the other hand, the welding cannot be made in the gap greater than 0.1mm; the result obtained by SFFTA is similar to t..." @default.
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- W2895888968 date "2000-01-01" @default.
- W2895888968 modified "2023-09-26" @default.
- W2895888968 title "Monitoring of YAG laser spot welding" @default.
- W2895888968 doi "https://doi.org/10.2351/1.5059505" @default.
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