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:
Apr. 01, 1980
Filed:
May. 19, 1978
Applicant:
Inventors:
Assignee:
Sumitomo Metal Industries, Ltd., Osaka, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B23K / ;
U.S. Cl.
CPC ...
219 73 ; 219 7612 ; 219 7614 ; 2191 / ; 2191 / ;
Abstract
Submerged arc welding process for 3.5% Ni steel which can provide a welded portion having a satisfactory impact resistance at low temperatures such as below minus 100.degree. C. In the process, use is made of a flux having a basicity as defined by a formula (CaO+MgO/SiO.sub.2) in weight percentages of between 1.5 and 3. The weld metal is deposited in a plurality of superimposed welded layers, each having a thickness less than 7 mm so that the weld metal in an underlying layer is thermally affected by an adjacent overlying layer whereby recrystallization is effected in substantial thickness of the underlying layer to provide a fine crystalline structure.