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:
Aug. 16, 2016
Filed:
Mar. 31, 2009
Thomas Edward Doyle, Louisville, OH (US);
Clyde David Noel, Houma, LA (US);
Terry Louis Breaux, Houma, LA (US);
Steven R. Peters, Huntsburg, OH (US);
Thomas Edward Doyle, Louisville, OH (US);
Clyde David Noel, Houma, LA (US);
Terry Louis Breaux, Houma, LA (US);
Steven R. Peters, Huntsburg, OH (US);
Lincoln Global, Inc., City of Industry, CA (US);
Abstract
A method and a system for forming a root pass weld for a root pipe joint. A substantially periodic electric welding waveform is generated and a series of electric arc pulses are generated between an advancing welding electrode and a root pipe joint in response to the electric welding waveform. The electric welding waveform includes a base cycle having a background current phase providing a background current level, a peak current phase providing a peak current level, a tail-out current phase providing a decreasing tail-out current level, and at least one heat-increasing current pulse during the background current phase providing a heat-increasing current level being above the background current level.