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Proceedings Paper

Infrared Sensors For Seam Tracking And Penetration Depth Control
Author(s): S. Nagarajan; W. H . Chen; K. N. Groom; B. A . Chin
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Paper Abstract

Implementation of robotics into welding is an important step towards higher productivity and better quality control of the fabrication process. However most robots currently perform welding in a "blind" fashion. In order to enhance the intelligence of the robots, several sensing techniques such as laser stripping, through-the-arc sensing and infrared thermography have been investigated. Most of these sensing techniques are capable of monitoring only a single welding parameter. However infrared thermography has shown promise t9 detect several types of impending weld defects. 1,4 The results presented in this paper identify approaches to obtain quantitative relationships to monitor the two major weld parameters, torch position and penetration depth. The asymmetry of the thermal profiles caused by an arc misalignment has been quantified into a torch seam error relationship by comparison of the features of thermal profiles on either sides of the calibrated torch position. To monitor the weld penetration depth the thermal distribution of the plates being welded were fitted to an ellipse using a least squares method. The principle features of the ellipse were found to be sensitive to the penetration depth of the plate being welded.

Paper Details

Date Published: 16 January 1989
PDF: 6 pages
Proc. SPIE 0954, Optical Testing and Metrology II, (16 January 1989); doi: 10.1117/12.947635
Show Author Affiliations
S. Nagarajan, Auburn University (United States)
W. H . Chen, Auburn University (United States)
K. N. Groom, Auburn University (United States)
B. A . Chin, Auburn University (United States)

Published in SPIE Proceedings Vol. 0954:
Optical Testing and Metrology II
Chander Prakash Grover, Editor(s)

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