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The overall aim of the project is to develop and test, in industrial conditions, advanced optical and non-contact ultrasonic techniques able to characterise online the laser weld quality. The techniques were applied in two cases : coil joining at the entry section of a rolling mill in Sidmar works (Arcelor); tailored blanks production. Moreover, criteria allowing to decide whether the weld quality is sufficient or not with regard to the service requirements of a rolling mill were searched. After analysing the results, the detection limits of the ultrasonic and the optical weld inspection system were assessed. Equipment was built during the project that is able to impose tension and compression in a weld in order to simulate the strains during rolling. By means of this equipment, it becomes possible to better assess the ability of the weld to be rolled. Weld heat treatments compatible with the industrial practice of a continuous line were defined in order to improve the ductility of the weld even for high strength steels like TRIP steels.

Additional information

Authors: SCHYNS M, CRM, Angleur (BE);OBERHOFF D, BFI, Düsseldorf (DE);VANDEVELDE F, Sidmar - Groupe Arcelor, Zelzate (BE)
Bibliographic Reference: EUR 22016 EN (2006), 102 pp. Euro: 15
Availability: Katalogue Number: KI-NA-22016-EN-S The paper version can be ordered online and the PDF version downloaded at:
ISBN: ISBN: 92-79-01678-4
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