Apparatus for non-destructively detecting a nugget for spot welding
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United States of America Patent
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May 5, 1998
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N/A
app pub date -
Nov 7, 1995
filing date -
Nov 11, 1994
priority date (Note) -
Expired
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Abstract
An apparatus for detecting a nugget for spot welding utilizing the magnetic after-effect which is generated when a variation in the magnetic field is applied to a nugget. The apparatus includes a driving coil, which applies a magnetic field variation to a spot-welded nugget, and a magnetism sensing element, which detects variations in magnetic flux density arising in the vicinity of the nugget as a result of the magnetic field variation. The magnetism sensing elements may be installed in an array form so as to face the nugget and the area around the nugget.
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