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:
Apr. 18, 2000
Filed:
Mar. 24, 1998
Takaaki Ogasawara, Toyohashi, JP;
Masaru Tabata, Toyohashi, JP;
Masahiro Homma, Toyohashi, JP;
Eiji Sato, Toyohashi, JP;
Kabushiki Kaisha Kobe Seiko Sho, Kobe, JP;
Abstract
A pulse arc welding apparatus feeds a consumable electrode with a constant rate, and arc-welds by applying a welding current constituted of a pulse current of a constant voltage characteristic and a base current of a constant current characteristic between the consumable electrode and a work piece. A pulse frequency correction circuit outputs a frequency correction value f.sub.e to a pulse frequency control circuit, such that when the pulse current upper limit value or lower limit value is selected continuously in a predetermined number of times at a pulse current comparison and adjustment circuit, pulse frequency is increased/decreased by a predetermined value .DELTA.-f by .DELTA.-f in accordance with the selected number of times. According to the pulse frequency control, the pulse arc welding apparatus is capable of substantially increasing a response of an arc length control, and enabling to follow a change of a welding condition and a fluctuation of the distance between a contact tip and a work piece promptly.