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Proceedings Paper

Sensor system for quality assurance in laser welding with filler wire
Author(s): Oliver Kropla
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Paper Abstract

This paper describes a system based upon an optical stereo sensor for measurement of the gap position and the joint gap width in laser welding. The measured width is used to control the filler wire speed. By means of sensor controlled filling of the missing material into the joint gap, manufacturing tolerances can be balanced and at an even seam quality, weld defects can be avoided. The sensor system is integrated into the work table control system thus allowing seam tracking based on the measured joint path. The stereo sensor consists of two lenses each featuring a plane deviating mirror by means of which the joining point is imaged upon each half of a CCD-line sensor. The image plane of the CCD-sensor and the principal plane of the lens system are running parallel and are positioned vertically towards the mirror surface thus avoiding distortions. In order to suppress plasma radiation which occurs during laser welding, the optics are shielded in the nearby infrared zone by means of a band-pass filter and the joining point is illuminated with a laser diode featuring a respective wavelength. A transputer net, coupled to the stereo camera and the wire feed system through a high-speed serial interface, serves the purpose of image interpretation and it shares a memory location with the work table control system for data exchange.

Paper Details

Date Published: 4 November 1994
PDF: 10 pages
Proc. SPIE 2246, Laser Materials Processing and Machining, (4 November 1994); doi: 10.1117/12.193118
Show Author Affiliations
Oliver Kropla, Univ. Aachen (Germany)

Published in SPIE Proceedings Vol. 2246:
Laser Materials Processing and Machining
Rolf-Juergen Ahlers; Peter Hoffmann; Hermann Lindl; Ruediger Rothe, Editor(s)

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