Plasma Plume Oscillations Monitoring during Laser Welding of Stainless Steel by Discrete Wavelet Transform Application

Sensors

Teresa Sibillano¹  Antonio Ancona¹  Domenico Rizzi¹  Valentina Lupo²  Luigi Tricarico¹ 

[1] CNR-INFM Regional Laboratory “LIT³”, via Amendola 173, I-70126 Bari, Italy; E-Mails:;Dipartimento di Ing. Meccanica e Gestionale, Politecnico di Bari, I-70126 Bari, Italy; E-Mail:

关键词: optical sensor;    laser welding;    plasma spectroscopy;   

DOI  :  10.3390/s100403549

来源: mdpi

【 摘 要 】

The plasma optical radiation emitted during CO₂ laser welding of stainless steel samples has been detected with a Si-PIN photodiode and analyzed under different process conditions. The discrete wavelet transform (DWT) has been used to decompose the optical signal into various discrete series of sequences over different frequency bands. The results show that changes of the process settings may yield different signal features in the range of frequencies between 200 Hz and 30 kHz. Potential applications of this method to monitor in real time the laser welding processes are also discussed.

【 授权许可】

CC BY   
© 2010 by the authors; licensee Molecular Diversity Preservation International, Basel, Switzerland.