Measuring and testing – Instrument proving or calibrating – Apparatus for measuring by use of vibration or apparatus for...
Reexamination Certificate
2007-05-01
2007-05-01
Noland, Thomas P. (Department: 2856)
Measuring and testing
Instrument proving or calibrating
Apparatus for measuring by use of vibration or apparatus for...
C073S597000, C073S602000, C073S609000, C702S103000, C702S116000
Reexamination Certificate
active
10512806
ABSTRACT:
The invention relates to a method for determining the threshold value of screens which enable an evaluation of a sound coupling during the ultrasound testing of a series of spot welding joints of a selected type. Initially, a geometrical minimal thickness dMin is established for the spot welding joints. At least one echo of the front surface (entrance echo) is received in addition to one echo of the first reflection on a rear wall of the spot welding joint (first rear wall echo) and at least one further (n-th) rear wall echo. The propagation time tMin of the ultra sound pulse is defined for the path to the front surface to the rear wall and back to the front surface at a minimal thickness dMin and a propagation time tT for the total thickness. A first screen (B1) is set for the signal of the rear wall echo, starting at a moment in time t1S=tE+tMin−tSA and ending at a moment in time t1T=tE+tT+tSE, whereby tSA and tSE are additional small security measures. An n-th screen is correspondingly determined for the n-th rear wall echo. The testing head is oriented differently.
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International Search Report; PCT/DE03/01545; Sep. 15, 2003 (date mailed).
Krautkraemer J. et al.; “State of the art in ultrasonic testing of sport welds”; XP-002206463; NDTnet Apr. 1998; vol. 3 No. 4 2 pages.
Buschke Paul
Kirchner Bernd
Agfa NDT GmbH
Cantor & Colburn LLP
Noland Thomas P.
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