Abstract: In this paper we describe a novel spectroscopic closed loop control system capable of stabilizing the penetration depth during laser welding processes by controlling the laser power. Our novel approach is to analyze the optical emission from the laser generated plasma plume above the keyhole, to calculate its electron temperature as a process-monitoring signal. Laser power has been controlled by using a quantitative relationship between the penetration depth and the plasma electron temperature. The sensor is able to correlate in real time the difference between the measured electron temperature and its reference value for the requested penetration depth. Accordingly the closed loop system adjusts the power, thus maintaining the penetration depth.
Keywords: laser welding; plasma spectroscopy; closed loop control
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Sibillano, T.; Rizzi, D.; Mezzapesa, F.P.; Lugarà, P.M.; Konuk, A.R.; Aarts, R.; Veld, B.H.; Ancona, A. Closed Loop Control of Penetration Depth during CO2 Laser Lap Welding Processes. Sensors 2012, 12, 11077-11090.
Sibillano T, Rizzi D, Mezzapesa FP, Lugarà PM, Konuk AR, Aarts R, Veld BH, Ancona A. Closed Loop Control of Penetration Depth during CO2 Laser Lap Welding Processes. Sensors. 2012; 12(8):11077-11090.
Sibillano, Teresa; Rizzi, Domenico; Mezzapesa, Francesco P.; Lugarà, Pietro Mario; Konuk, Ali Riza; Aarts, Ronald; Veld, Bert Huis in ’t; Ancona, Antonio. 2012. "Closed Loop Control of Penetration Depth during CO2 Laser Lap Welding Processes." Sensors 12, no. 8: 11077-11090.