Closed loop control of penetration depth during CO2 laser lap welding processes

T. Sibillano, D. Rizzi, F.P. Mezzapesa, P.M. Lugara, A.R. Konuk, Ronald G.K.M. Aarts, Bert Huis in 't Veld, A. Ancona

Research output: Contribution to journalArticleAcademicpeer-review

21 Citations (Scopus)
70 Downloads (Pure)


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.
Original languageEnglish
Article numberID: sensors-18601
Pages (from-to)11077-11090
JournalSensors (Switzerland)
Issue number8
Publication statusPublished - 2012


  • METIS-288460
  • IR-81839


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