A computer-aided inspection system for automatic detection and classification of internal and surface defects in metal strips (ferritic and austenitic steels, and also NF metals) has been developed for use in rolling lines.
Lamb waves are used for the inspection, since they have a high defect detection sensitivity, and their low attenuation makes it possible to inspect large strip widths.

Technical data

Strip parameters

Strip speed	v < 20,0 m/s
Strip width	50 mm < b < 1650 mm
Strip thickness	0,1 mm < d < 6,3 mm

Defect parameters  

Smallest detectable defect area
AF = 0.11 mm • d (for elongated defects)
The inspection system uses two electromagnetic ultrasonic angle-beam probes, which are guided contactlessly over the strip. The electronic components are divided into individual units and operate fully automatically in online mode, inspecting 100% of the volume and strip surface.