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This research consists of the development of a fast and nondestructive reliable system for the online control of the weld between steel strips. A thermographic method was selected which is based on analysis of the infrared map of the weld. A transverse field of 20 mm located 50 mm away from the melting area is scanned by a linescan camera at a rate of 100 Hz with a definition amounting to 0.5 mm. A software was developed for detecting and memorizing the highest level of the temperature over each transverse scan. More than 150 welds, carried out under decreasing intensities of the electrical current and controlled by Erichsen tests, validated this thermographic method. A weld can be validated when the above mentioned temperature evolution over its length displays a mean level greater than a threshold and, moreover, a restricted standard deviation. A second software handles the data from the last 2000 welds and determines a mean temperature which reflects the time evolution of the status of the welder, points out the drifts in running and avoids breakdowns when a predictive maintenance has been scheduled.

Additional information

Authors: SCHYNS M, Centre de Recherches Métallurgiques, Liège (BE);PIRLET R, Centre de Recherches Métallurgiques, Liège (BE)
Bibliographic Reference: EUR 15478 FR (1996) 46pp., FS, ECU 7.00
Availability: Available from the (2)
ISBN: ISBN 92-827-6121-C
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