Abstract
Defects detection of ferromagnetic steel thin sheet is very important in metallurgical industry. In this article, a new magnetic flux leakage (MFL) technology is used to complete this task. In our work, a tiny permanent magnet is used to replace the conventional coils to magnetize testing specimen and precise Tunnel Magneto-resistive (TMR) sensor is employed because of its superior sensitivity and linear operation range over traditional magneto-resistive sensors. Two kinds of thin sheets were selected: galvanized sheet and cold-rolled sheet. The experimental results indicate that the present method is reliable for detecting defects of steel thin sheet, and defects with diameter of 400 and 20 μm can be detected clearly for galvanized sheet and cold-rolled sheet, respectively. This accuracy fully satisfies the metallurgical production requirement. This method exhibits its potential to realize in-situ, online inspection process of thin sheet production.
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