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:
Oct. 24, 1989
Filed:
Jun. 29, 1988
Applicant:
Inventors:
Assignee:
Hitachi Seiko, Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B23K / ;
U.S. Cl.
CPC ...
21913051 ; 2191304 ;
Abstract
An arc welding power source supplies a high voltage for the reignition of an arc after the polarity reversal of a welding current to prevent the destruction of circuit elements and ensure the stable and positive polarity reversal despite its reduced size, and also the occurrence of a spike voltage in a main circuit during the polarity reversal of a large current or alternatively the welding current during the polarity reversal is controlled to suppress a spike voltage during the current reversal.