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The traditional method of inspecting the surface of hot steel bars has been to use surrounding coil eddy-current techniques which have inherent deficiencies. These systems of inspection are insensitive to long seam defects and also transverse defects and are generally limited to bars which are less than 75 mm in diameter. The objects of this project is to develop an alternative method that can overcome these deficiencies and extend the range of bar sizes that can be tested. The development of water cooled inspection probe assemblies which are capable of being grouped around the bar circumference and the development of very stable electronics for signal processing have been the key features associated with the success of this project. Plant trails with a five channel inspection head confirmed the defect detection capability and the excellent signal to noise ratios suggest that defect detection limits may well be improved down to the 0.5 mm level.

Additional information

Authors: SAVIDGE D, British Steel, Swinden Technology Centre, Rotherham (GB)
Bibliographic Reference: EUR 15814 EN (1996) 41pp., FS, ECU 7
Availability: Available from the (2)
ISBN: ISBN 92-827-7122-9
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