Closed Loop Control of Penetration Depth during CO2 Laser Lap Welding Processes

Sensors

Teresa Sibillano¹  Domenico Rizzi¹  Francesco P. Mezzapesa¹  Pietro Mario Lugar๠ Ali Riza Konuk²  Ronald Aarts²  Bert Huis in 't Veld² 

[1] CNR-IFN Institute for Photonics and Nanotechnologies, UOS Bari, 70126 Bari, Italy; E-Mails:;Laboratory of Mechanical Automation, University of Twente, 7500 AE Enschede, The Netherlands; E-Mails:

关键词: laser welding;    plasma spectroscopy;    closed loop control;   

DOI  :  10.3390/s120811077

来源: mdpi

【 摘 要 】

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.

【 授权许可】

CC BY   
© 2012 by the authors; licensee MDPI, Basel, Switzerland.