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:
Jan. 18, 2000
Filed:
Aug. 03, 1998
Ivan E Baker, Concord, OH (US);
Lincoln Global, Inc., Cleveland, OH (US);
Abstract
In an electric arc welder for creating an electric arc for melting and depositing metal from an advancing welding wire onto a workpiece, said welder including a power supply having a switch operated by a pulse width modulator for creating a series of current pulses having a fixed frequency and a conduction width determined by the command voltage of a control signal driving said pulse width modulator and an error amplifier for generating the command signal in accordance with a set point voltage, the improvement comprising: first set point means for creating a fixed set point voltage, second set point means for creating a ramp set point voltage increasing at a selected rate from a starting voltage to create a selected slope, a toggle means having a first toggled condition for connecting said first set point means to the error amplifier and a second toggled condition for connecting said second set point means to the error amplifier, means for creating a short signal when the wire shorts against the workpiece and means for toggling the toggle means from said first condition into said second condition in response to a short circuit signal.