Nippon Steel Corporation

Nippon Steel Sumitomo Metal Corporation

Toshisuke Fukami

Noboru Hasegawa

Kazuto Yamamoto

Hideki Hamatani

Takao Miura

Nobuo Mizuhashi

Takashi Miyakawa

Michimasa Mukai

Yoshifumi Karube

Kimiharu Tanaka

A method for monitoring welding of an electric resistance welded steel pipe of the present invention includes: an image acquisition step in which, when an electric resistance welded steel pipe is welded, a V-convergence portion including an edge detection area and a V-convergence point, and a welding portion including a position where a molten steel starts to be discharged from an inside of a wall thickness and a bead, are imaged to obtain a captured image; a determination information acquisition step in which the captured image is image-processed, and a molten length from the V-convergence point to the position where the molten steel starts to be discharged or a molten width of the welding portion or a combination thereof is acquired as a determination information; and a determining step in which it is determined whether a cold welding has occurred by comparing the determination information with a determination threshold value set in advance for each wall thickness of the electric resistance welded steel pipe.

Method for monitoring welding of electric resistance welded steel pipe, method for manufacturing electric resistance welded steel pipe, device for monitoring welding of electric resistance welded steel pipe, and device for manufacturing electric resistance welded steel pipe

An electric resistance welding operation management device manages a welding operation during manufacture of electric resistance welded steel pipe, in which heat is input to a steel plate, that is being conveyed along a specific conveyance direction and formed into a circular tube shape while pressing side faces of the metal plate with a pair of squeeze rolls, to weld together two circumferential direction edge portions of the metal plate converging in a V-shape. The electric resistance welding operation management device includes an image input section that inputs plural images and each including a Vee convergence region of the steel plate. The electric resistance welding operation management device includes a welding point position derivation section that derives the position of a welding point.

Electric resistance welding operation management device, electric resistance welding operation management method, and computer program

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Tokyo, Japan

Toshisuke Fukami