Title:
電縫鋼管溶接監視方法、電縫鋼管製造方法、電縫鋼管溶接監視装置、及び電縫鋼管製造装置
Document Type and Number:
Japanese Patent JP7081718
Kind Code:
B2
Abstract:
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.
Inventors:
Hasegawa Noboru
Takashi Miyagawa
Sincerity
Shunsuke Fukami
Takashi Miyagawa
Sincerity
Shunsuke Fukami
Application Number:
JP2021505010A
Publication Date:
June 07, 2022
Filing Date:
March 06, 2020
Export Citation:
Assignee:
Nippon Steel Corporation
International Classes:
B23K13/00; B23K31/00
Domestic Patent References:
| JP6323293B2 | ||||
| JP5014837B2 | ||||
| JP5332287B2 | ||||
| JP6221013B1 | ||||
| JP5079929B2 | ||||
| JP5549963B2 |
Foreign References:
| WO2018092492A1 |
Attorney, Agent or Firm:
Sumio Tanai
Mitsuo Teramoto
Tomomasa Katsumata
Hiroshi Yamaguchi
Mitsuo Teramoto
Tomomasa Katsumata
Hiroshi Yamaguchi