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.
Highlights
Traditional off-line inspection of welded joints is expensive and reduces productivity, and the lack of effective on-line controls in laser machining is one of the main obstacles for the full implementation of laser welding technologies in industrial applications.Several solutions have been proposed in recent years for the development of automated on-line laser welding monitoring sensors
We will focus on our last experimental results on the development of an optical sensor, based on plasma spectroscopy, especially conceived for real-time control and optimization of the welding processes using a CO2 laser source
Several welding trials have been carried out in recent years to check whether the electron temperature and the correlation coefficient signals can be a valuable source of information for the development of a real-time monitoring sensor
Summary
Teresa Sibillano 1,*, Antonio Ancona 1 , Vincenzo Berardi 2 and Pietro Mario Lugarà 1,2. Dipartimento Interateneo di Fisica, Università e Politecnico di Bari, Via E. Received: 4 March 2009; in revised form: April 2009 / Accepted: April 2009 /
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