Method and apparatus using magnetic flux scanning to test grain structure of magnetic sheet material
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United States of America Patent
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Jul 5, 1994
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N/A
app pub date -
Mar 19, 1992
filing date -
Mar 19, 1992
priority date (Note) -
Expired
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Abstract
The grain structure of electrical steel strip is tested by inducing a magnetic flux field into the strip by pole pieces at opposite sides of a permanent magnet. A magnetic detector head between the pole pieces responds to the leakage of flux as the steel strip and/or magnetic detection undergoes relative movement. A recorder is used to identify banding and mixed grain structures which cause a smaller flux leakage amplitude than larger desired grains.
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