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Proceedings Paper

Sensing and control system of process quality in CO2 laser deep-penetration welding
Author(s): Wuzhu Chen; Xudong Zhang; Jiangcheng Bao; Yong Wang; Tianya Li; Ping Jiang; Hongjun Zhang
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Paper Abstract

A sensing and control system of process quality in CO2 laser deep penetration welding has been developed, including plasma photo sensor (PS) and plasma charge sensor (PCS), signal processing circuit, personal computer, and optimization and control software. By using the information of plasma radiation and plasma charge, the focusing lens is adjusted to the optimum focal point position (at which the maximum penetration can be achieved) and closed-loop control is realized to assure the focal point position and penetration depth constant. In laser welding of the workpiece aslant placed with larger angle, the variation of focal point position is less than 0.2 mm and the fluctuation of penetration depth is less than 0.05 mm. The control system has been preliminarily applied in laser precision welding of 2.5 m long zircaloy fuel channel used in nuclear heat-supply reactor.

Paper Details

Date Published: 15 August 1998
PDF: 11 pages
Proc. SPIE 3550, Laser Processing of Materials and Industrial Applications II, (15 August 1998); doi: 10.1117/12.317899
Show Author Affiliations
Wuzhu Chen, Tsinghua Univ. (China)
Xudong Zhang, Tsinghua Univ. (China)
Jiangcheng Bao, Tsinghua Univ. (China)
Yong Wang, Tsinghua Univ. (China)
Tianya Li, Tsinghua Univ. (China)
Ping Jiang, Tsinghua Univ. (China)
Hongjun Zhang, Tsinghua Univ. (China)

Published in SPIE Proceedings Vol. 3550:
Laser Processing of Materials and Industrial Applications II
ShuShen Deng; S. C. Wang, Editor(s)

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