Monitoring of Laser Welding Processes by Optical Emission Spectroscopy

摘要

Technological processes including laser welding that use a laser beam are typically accompanied with the occurrence of laser-induced plasma. This physical phenomenon is investigated by many different monitoring methods and optical emission spectroscopy is the most common. The recent advent of miniature fibre optic spectrometers and relative cheap and powerful computers has provided a very promising tool for on-line spectral analysing of laser-induced plasma. The contribution deals with the on-line monitoring of laser-induced plasma during laser beam welding by optical emission spectroscopy. In this study a continuous-wave CO_2 laser with output power up to 3 kW was used. Circumstances of partial and full penetration of welded specimen material and the relation with spectroscopic parameters of laser-induced plasma were investigated.