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. 19, 1982
Filed:
Feb. 02, 1981
Applicant:
Inventors:
Assignee:
Nippon Steel Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B05D / ;
U.S. Cl.
CPC ...
427 61 ; 427 59 ; 4271262 ; 4271263 ; 4271264 ; 4273762 ; 4273764 ; 4273765 ; 427380 ; 4273978 ;
Abstract
In a low hydrogen type covered arc-electrode, the sources of diffusible hydrogen are kept to a low level by selecting kind of the ingredients for producing the electrodes or by baking the ingredients. In the process of the present invention, the covered arc-electrode is baked at a high temperature so as to extremely reduce the amount of the sources of diffusible hydrogen of the weld metal, while decomposition of limestone, which is one of the covering components, is prevented due to a novel baking atmosphere containing CO.sub.2. The weight ratio of Na.sub.2 O/K.sub.2 O in the covering is adjusted to be 1 or more, so as to keep amount of fumes.