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
Robotic
fabrication
Machine vision
part
Laser deposition
qualification
powder deposition
welding equipment
temperature
Author
A. Heralic
University West
A. K. Christiansson
University West
M. Ottosson
University West
Bengt Lennartson
Chalmers, Signals and Systems, Systems and control
Optics and Lasers in Engineering
0143-8166 (ISSN)
Vol. 48 4 478-485Areas of Advance
Production
Subject Categories
Atom and Molecular Physics and Optics
DOI
10.1016/j.optlaseng.2009.08.012