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:
May. 14, 2002
Filed:
Nov. 27, 2000
Ralph M. Samodell, Willoughby Hills, OH (US);
Trang D. Nguyen, Mentor, OH (US);
Lincoln Global, Inc., Monterey Park, CA (US);
Abstract
A DC TIG welder operable at a set low current level under about 5 amperes in a welding circuit including an electrode separated from a workpiece by a gap, the welder having an output welding current adjustable above the low current and driven by a constant current power supply with a first rectifier having an output current controlled by the firing phase of SCRs in an SCR network, a second rectifier settable at the low current and a sensor for sensing arc voltage. The welder further comprises: a circuit to deactivate the SCRs when the output welding current is equal to or less than the set low current and an arc starting device to cause the first rectifier to output a high pulse by operation of the SCRs of the network.