Product Code: ICAL05_1806

Robust Process-Controller for Nd:YAG Laser Welding
Authors:
Jeroen Olde Benneker, Netherlands Institute of Metals Research; Enschede Overijssel The Netherlands
Menno De Graaf, University of Twente; Enschede Netherlands
Ben Jonker, University of Twente; Enschede Overijssel The Netherlands
Johan Meijer, University of Twente; Enschede Overijssel The Netherlands
Ronald Aarts, University of Twente; Enschede Overijssel The Netherlands
Presented at ICALEO 2005

A robust process-controller was developed which maintains a fully penetrated weld. This feedback-controller is robust for various process disturbances that may occur,
like variations in sheet thickness, welding velocity, focal position, shielding gas variations, etc. The signals from an optical sensor are used to design a so-called ?switching? controller, which enables fully penetrated welding at a minimum amount of laser power. It is shown that the working principle of the controller is applicable to different material types, more specific different steels and stainless steels. Experiments have been carried out to show the ability to cope with varying sheet thickness and welding velocity on FeP04 mild steel. Furthermore a method is described which can be used to easily find a good set of control parameters from a single identification experiment.