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. 02, 1976
Filed:
May. 18, 1973
Motomi Kano, Fujisawa, JA;
Hitoshi Shioyama, Kamakura, JA;
Yasuhito Takeuti, Fujisawa, JA;
Masahiro Niikawa, Kamakura, JA;
Kobe Steel Ltd., Kobe, JA;
Abstract
There is disclosed a novel arc welding process of the type in which an electrode is placed in a weld groove with an insulating material interposed between the electrode and the inner surfaces of said groove. The process utilizes the principle by which an arc produced tends to be directed toward a region having the least or thinnest density of magnetic flux. Accordingly, this permits the welding arc produced to be directed toward the desired portion in the weld groove, thereby giving greater penetration thereat. For such purposes, various embodiments are presented, such as placing a subsidiary backing member of a ferromagnetic substance above or beneath the weld groove, causing electric current to flow through the backing member independently of the welding current, or providing two backing members in the same manner described through which, for instance, alternating currents having a phase difference of 180.degree. are caused to flow with a direct current used as a welding current to thereby alternately direct the welding arc between said inner surfaces of the weld groove, with a resultant uniform but deep penetration therein. This principle further permits the adjustment of the depth of penetration by controlling the amount of the electric current flowing through the backing member.