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.
temperature
power diode-laser
Metal wire
welding equipment
Laser deposition
Machine vision
Process control
powder deposition
fabrication
qualification
part
Robotic
Author
A. Heralic
Hogskolan Vast
A. K. Christiansson
Hogskolan Vast
M. Ottosson
Hogskolan Vast
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 (SSIF 2011)
Atom and Molecular Physics and Optics
DOI
10.1016/j.optlaseng.2009.08.012