The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 13, 2018
Filed:
May. 12, 2010
Helmut Ennsbrunner, Leonding, AT;
Thomas Gschmeidler, Scharnstein, AT;
Helmut Ennsbrunner, Leonding, AT;
Thomas Gschmeidler, Scharnstein, AT;
Fronius International GmbH, Pettenbach, AT;
Abstract
A method and an apparatus for determining the temporal curve of the voltage (u(t)) at the electrodes () of a spot welding gun () during a spot welding process as an indicator of the welding quality, wherein the electrodes () are fastened to gun arms () that can be moved relative to each other are provided. The apparatus includes a device () for measuring a measuring voltage (u(t)) between the electrodes (), that measuring device () being connected to measuring leads () extending along the gun arms (), and further includes a compensating coil () for measuring a compensating voltage (u(t)) for compensating measuring errors within measuring leads. In order to determine the temporal curve of the voltage (u(t)) at the electrodes () of the spot welding gun () during a spot welding process as precisely as possible, the device () for measuring the measuring voltage (u(t)) and the device () for measuring the compensating voltage (u(t)) are designed as separate units for separate detection and are connected to a device () for processing the detected values.