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Alexander Bollig, Stefan Mann, Ralf Beck, Stefan Kaierle

Application of Optical Technologies for Closed Loop Control of Laser Beam Welding

Welding with laser beams is an innovative optical technique, which leads to higher penetration depth and a narrower seam compared to conventional welding techniques. Significant criteria of the quality of a junction besides detected faults are the penetration depth and the seam width. Within this article optical sensors for process monitoring as well as a predictive control scheme based on these are presented. In the closed loop control the process´ inputs laser power and focal position are optimised by taking the future welding speed into account. For modelling the physical demanding, non-linear process an Artificial Neural Network with external dynamics is applied. First results of the application on a real laser welding system are described.

at – Automatisierungstechnik, Oldenbourg Wissenschaftsverlag

Print ISSN: 0178-2312
Volume: 53, 10/2005
Pages: 513 - 521

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