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. 02, 1999
Filed:
Sep. 19, 1996
Hiroshi Shimada, Chiba-ken, JP;
Miyachi Technos Corporation, Chiba-ken, JP;
Abstract
In order to improve the quality of seam welding, an inverter seam resistance welding electric power supply apparatus reliably determines local weldability (conforming/defective) of seam welding by simply monitoring welding current. In a seam welding operation, when a current monitor time interval has elapsed, a CPU reads, from storage, measured current values �I.sub.1 !, �I.sub.2 !, etc., of each inverter cycle obtained during the current monitor time interval and computes an average current value �I.sub.M1 ! thereof, according to an averaging method such as an arithmetic mean method. Then the CPU compares the average current value �I.sub.M1 ! with a preselected monitoring value or range. If the average current value �I.sub.M1 ! falls within the monitoring range, the CPU determines the occurrence of a conforming local welding whereas it determines the occurrence of a defective local welding if the average current value goes out of the monitoring range. For successive determinations of defective local welding for a preselected number of times, for instance, three, the CPU determines that a defective seam welding has occurred, and takes appropriate action immediately, for instance, by stopping the seam welding operation.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile