A portable lamination detector for steel sheet
B O Smith; A P H Jennings; A G Grimshaw; B O Smith; Physics Department, The British Iron and Steel Research Association, Battersea Park Road, London; A P H Jennings; Physics Department, The British Iron and Steel Research Association, Battersea Park Road, London; A G Grimshaw; Physics Department, The British Iron and Steel Research Association, Battersea Park Road, London
Журнал:
British Journal of Applied Physics
Дата:
1958-05-01
Аннотация:
This paper describes a method of detecting laminations in steel sheet based on the distortion they cause in the flow pattern of an electric current through the sheet. Direct current is passed through the sheet between two contacts on opposing faces while the potential difference between two adjacent contacts is measured. This potential difference is very small in sound material but rises sharply if a lamination is present.Not every lamination can be detected by this method because, for this to happen, it is essential that it should form an electrical discontinuity. For example, experience has shown that in hot-rolled strip most of the laminations are not detected, but in cold-rolled strip the great majority above 0.25 in. wide do form a discontinuity and can be detected with certainty by the instrument described.
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