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:
Jan. 29, 2019
Filed:
Jun. 12, 2015
Takahiko Kanai, Kanagawa, JP;
Munehisa Hatta, Kanagawa, JP;
Fumiaki Ikuta, Kanagawa, JP;
Kazuhiro Kawasaki, Kanagawa, JP;
Eizaburo Nakanishi, Kanagawa, JP;
Tsuyoshi Yoshida, Kanagawa, JP;
Kotobu Nagai, Ibaraki, JP;
Masao Hayakawa, Ibaraki, JP;
Takehiko Itagaki, Ibaraki, JP;
Takahiko Kanai, Kanagawa, JP;
Munehisa Hatta, Kanagawa, JP;
Fumiaki Ikuta, Kanagawa, JP;
Kazuhiro Kawasaki, Kanagawa, JP;
Eizaburo Nakanishi, Kanagawa, JP;
Tsuyoshi Yoshida, Kanagawa, JP;
Kotobu Nagai, Ibaraki, JP;
Masao Hayakawa, Ibaraki, JP;
Takehiko Itagaki, Ibaraki, JP;
NETUREN CO., LTD., Tokyo, JP;
NATIONAL INSTITUTE FOR MATERIALS SCIENCE, Ibaraki, JP;
Abstract
A welding equipment for metallic materials capable of performing heat treatment such as tempering based on partial heating in spot welding is provided. The welding equipment sandwiches metallic materials with a pair of electrodes, and heats different regions of the metallic materials by energization, with the pair of electrodes maintained at the same position with respect to the metallic materials. The welding equipment includes a first heating means connected to the pair of electrodes for heating and welding the internal region of the circle defined by projecting the cross-sectional area of the axis of the electrodes on the metallic materials by applying power having a low first frequency, a second heating means for heating a ring-shaped region along the circle by applying power having a second frequency that is higher than the first frequency, and an energization control unit for independently controlling the first and the second heating means.