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:
Mar. 31, 1992
Filed:
Dec. 20, 1990
Applicant:
Inventors:
Hitoshi Matsui, both Toyota, JP;
Taiji Hattori, both Toyota, JP;
Assignee:
Toyota Jidosha Kabushiki Kaisha, Toyota, JP;
Primary Examiner:
Int. Cl.
CPC ...
B23K / ;
U.S. Cl.
CPC ...
21913761 ; 219136 ;
Abstract
A contact tip for arc welding includes a feed surface constructed of conductive material which has a negative thermoelectromotive force with respect to pure platinum at temperatures above 0.degree. C. When welding current flows from the contact tip to a welding wire, an endothermic reaction occurs at the feed surface to lower the temperature of the feed surface and to improve the thermal durability of the contact tip.