Patent · US Active

Method for automated measurement of the residual magnetic field strength of magnetized ferromagnetic workpieces

US8941376B2 · kind B2 · utility

0Cited by

1References

7Claims

0Family size

Assignee

VALLOUREC DEUTSCHLAND GmbH · DE

Inventors

Michael Kaack · Bochum, DE
Stefan Nitsche · Seelow, DE
André Germes · Mülheim an der Ruhr, DE

Key dates

Filing date	Nov 18, 2009
Grant date	Jan 27, 2015
Priority date	—
Expiry date	Feb 11, 2031

Classification

Technology area (CPC G)Physics
CPC primaryG01N27/87
WIPO fieldMeasurement
WIPO sectorInstruments

Abstract

The invention relates to a method for the automated measurement of the residual magnetic field strength of magnetized ferromagnetic workpieces, especially steel tubes, the residual magnetic field exiting the face of the tube end being measured by means of a measuring probe. Instead of directly measuring the residual field strength on the face, the curve of at least one magnetic field component is measured on the outer surface of the tube at least in the region of the tube ends and beyond the tube ends and the residual field strength on the face is inferred on the basis of the previously determined correlations between the residual field strength measured on the face and on the tube surface.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.