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. 2009;9(5):3376-85.
doi: 10.3390/s90503376. Epub 2009 May 7.

A real-time spectroscopic sensor for monitoring laser welding processes

Teresa Sibillano  1 , Antonio Ancona, Vincenzo Berardi, Pietro Mario Lugarà
Affiliations

A real-time spectroscopic sensor for monitoring laser welding processes

Teresa Sibillano et al. Sensors (Basel). 2009.

Abstract

In this paper we report on the development of a sensor for real time monitoring of laser welding processes based on spectroscopic techniques. The system is based on the acquisition of the optical spectra emitted from the laser generated plasma plume and their use to implement an on-line algorithm for both the calculation of the plasma electron temperature and the analysis of the correlations between selected spectral lines. The sensor has been patented and it is currently available on the market.

Keywords: Optical sensor; laser welding; plasma spectroscopy.

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Figures

Figure 1.
Figure 1.
Plasma optical emission in the range 400-530 nm with a resolution of 0.07 nm, obtained during CO2 laser welding of AISI 304 stainless steel.
Figure 2.
Figure 2.
Correlation (top) and anti-correlation (bottom) maps for Al-Mg aluminium alloys.
Figure 3.
Figure 3.
Electron temperature signals along the welded joints in presence of (a) a defect free weld (b) laser power variations and (b) crater formation.
Figure 4.
Figure 4.
Correlation and anti-correlation map for Mg and Al for effective and ineffective shielding gas condition.
Figure 5.
Figure 5.
Cr(I) electron temperature and correlation signals for variable welding speed.
See this image and copyright information in PMC

References

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