Increased stability in laser metal wire deposition through feedback from optical measurements
Journal article, 2010

Robotized laser metal-wire deposition is a fairly new technique being developed at University West in cooperation with Swedish industry for solid freeform fabrication of fully densed metal structures. It is developed around a standard welding cell and uses robotized fiber laser welding and wire filler material together with a layered manufacturing method to create metal structures. In this work a monitoring system, comprising two cameras and a projected laser line, is developed for on-line control of the deposition process. The controller is a combination of a PI-controller for the bead width and a feed-forward compensator for the bead height. It is evaluated through deposition of single-bead walls, and the results show that the process stability is improved when the proposed controller is used. (C) 2009 Elsevier Ltd. All rights reserved.

power diode-laser

Process control

Metal wire



Machine vision


Laser deposition


powder deposition

welding equipment



A. Heralic

University West

A. K. Christiansson

University West

M. Ottosson

University West

Bengt Lennartson

Chalmers, Signals and Systems, Systems and control, Automation

Optics and Lasers in Engineering

0143-8166 (ISSN)

Vol. 48 4 478-485

Areas of Advance


Subject Categories

Atom and Molecular Physics and Optics



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