Contributo in atti di convegno, 2011, ENG, 10.1016/j.phpro.2011.03.093

Process control of stainless steel laser welding using an optical spectroscopic sensor

Konuk A.R., Aarts R.G.K.M., Veld A.J.H., Sibillano T., Rizzi D., Ancona A.

Laboratory of Mechanical Automation, University of Twente, P.O. Box 217, Enschede, 7500 AE, Netherlands CNR-IFN UOS Bari, Physics Department, Via Amendola 173, I-70126 Bari, Italy

The in-process monitoring and real-time control of the penetration depth during laser welding is evaluated. An optical collimator collects the optical emission for measurement with a fast spectrometer. The sensor data are used to calculate the electron temperature and subsequently to determine the weld quality of overlap welds in AISI 304 stainless steel sheets performed both with CW Nd:YAG and CO2 lasers. A PI-controller adjusts the laser power aiming at a constant penetration depth and has been tested for Nd:YAG laser welding. Optical inspection of the weld verifies the results obtained with the proposed closed-loop system of spectroscopic sensor and controller.

6th International WLT Conference on Lasers in Manufacturing, LiM, pp. 744–751, Munich; Germany, 23-26 May 2011

Keywords

AISI-304 stainless steel, Constant penetration, In-process monitoring, Laser power, Laser welding process control, Nd:YAG laser welding, Optical emissions, Optical inspection, Optical spectroscopic, PI controller, Plasma emission spectroscopy, Sensor data, Weld quality, Carbon dioxide, Controllers, Emission spectroscopy, Laser beam welding, Manufacture, Neodymium, Optical collimators, Optical testing, Process control, Process monitoring, Real time control, Sensors, Spectrometers, Stainless steel, Steel sheet, Welds, Neodymium lasers

CNR authors

Rizzi Domenico, Sibillano Teresa, Ancona Antonio

CNR institutes

IFN – Istituto di fotonica e nanotecnologie