Nippon Steel Sumitomo Metal Corporation

Kunihiko Hatabara

Kazuto Yamamoto

Hideki Hamatani

Takao Miura

Noboru Hasegawa

Nobuo Mizuhashi

Shoji Shibata

Michiaki Ishihara

Sohken Mitsui

Yoichi Fujikake

The rotary transformerincludes a plate-shaped statorhaving a coil arranged on one surface thereof, and a plate-shaped rotatorhaving a coil arranged on one surface thereof, in which the respective coil-arranged surfaces are disposed to face with each other so that signal transmission in a frequency range of 1 to 10 MHz is performed between the coils. The stator includes a substrateon which a plurality of one-turn coils are formed into a concentric shape, and a supporting member. The rotator includes a substrateon which one-turn coilsof same number are formed into a concentric shape, and a supporting member. Air or a material M which is an insulator and has a relative magnetic permeability substantially equal to 1 is lying between the substrateand the supporting member, and between the substrateand the supporting member

Rotary transformer for rotary ultrasonic testing apparatus and rotary ultrasonic testing apparatus using the same

An operation management device performs an operation management for electric resistance welding in which a strip-shaped metal plate is formed to have a cylindrical shape in such a manner that both end portions of the metal plate gradually face each other while the metal plate is conveyed, and a Vee convergence section, which is a portion at which both of the end portions butt against each other while facing each other, is welded. Furthermore, the operation management device includes: a measuring unit that measures a distance L [mm] between a first Vee convergence point at which both of the end portions of the metal plate geometrically come into contact with each other and a second Vee convergence point that is a contact point of both of the end portions of the metal plate, and a Vee convergence angle &#x3b8;[&#xb0;] at the first Vee convergence point on the basis of an image of an area including the Vee convergence section; and a determining unit that determines whether or not the distance L [mm] and the Vee convergence angle &#x3b8;[&#xb0;] satisfy the following equation (1).(&#x3b8;/&#x3b8;)&#x2266;35&#x2003;&#x2003;(1)

Operation management device, operation management method, and operation management program for high-frequency resistance welding and induction welding

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Tokyo, Japan

Kunihiko Hatabara