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Proceedings Paper

Method for controlling a laser additive process using intrinsic illumination
Author(s): Robert Tait; Guoshuang Cai; Magdi Azer; Xiaobin Chen; Yong Liu; Kevin Harding
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Paper Abstract

One form of additive manufacturing is to use a laser to generate a melt pool from powdered metal that is sprayed from a nozzle. The laser net-shape machining system builds the part a layer at a time by following a predetermined path. However, because the path may need to take many turns, maintaining a constant melt pool may not be easy. A straight section may require one speed and power while a sharp bend would over melt the metal at the same settings. This paper describes a process monitoring method that uses the intrinsic IR radiation from the melt pool along with a process model configured to establish target values for the parameters associated with the manufacture or repair. This model is based upon known properties of the metal being used as well as the properties of the laser beam. An adaptive control technique is then employed to control process parameters of the machining system based upon the real-time weld pool measurement. Since the system uses the heat radiant from the melt pool, other previously deposited metal does not confuse the system as only the melted material is seen by the camera.

Paper Details

Date Published: 14 May 2015
PDF: 7 pages
Proc. SPIE 9489, Dimensional Optical Metrology and Inspection for Practical Applications IV, 948909 (14 May 2015); doi: 10.1117/12.2182511
Show Author Affiliations
Robert Tait, GE Global Research (United States)
Guoshuang Cai, GE Global Research (United States)
Magdi Azer, GE Global Research (United States)
Xiaobin Chen, GE Global Research (United States)
Yong Liu, GE Global Research (United States)
Kevin Harding, GE Global Research (United States)

Published in SPIE Proceedings Vol. 9489:
Dimensional Optical Metrology and Inspection for Practical Applications IV
Kevin G. Harding; Toru Yoshizawa, Editor(s)

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