Title:
SEAM-WELDED STEEL PIPE MANUFACTURING METHOD AND ITS MANUFACTURING APPARATUS
Document Type and Number:
WIPO Patent Application WO/2008/099943
Kind Code:
A1
Abstract:
A method for stably manufacturing a seam-welded steel pipe whose welded portion
has a desired good tenacity even if the dimensions of the steel band used as a base
metal vary. Groove shapes (5a, 5b) are given to the edges (4a, 4b) of an open pipe
(4). The edges (4a, 4b) are continuously imaged by an edge shape monitor (11)
immediately before seam welding. The captured image is inputted into a computing
device (14) and subjected to image processing. Thus, the groove depth h is measured.
According to the determination result, an optimum welding power is computed,
and the welding power from a welding power generating device (6) is adjusted.
Further, after seam-welding, the distribution of oxides in the welded portion
is continuously measured by means of an ultrasonic flaw detector (15). According
to these measurement results, an optimum welding power is computed, and the welding
power from the welding power generating device (6) can be adjusted.
Inventors:
INOUE, Tomohiro (JFE STEEL CORPORATION 2-3, Uchisaiwai-cho 2-chome, Chiyoda-k, Tokyo 11, 1000011, JP)
井上智弘 (〒11 東京都千代田区内幸町二丁目２番３号ＪＦＥスチール株式会社 知的財産部内 Tokyo, 1000011, JP)
SAKASHITA, Shigeto (JFE STEEL CORPORATION 2-3, Uchisaiwai-cho 2-chome, Chiyoda-k, Tokyo 11, 1000011, JP)
坂下重人 (〒11 東京都千代田区内幸町二丁目２番３号ＪＦＥスチール株式会社 知的財産部内 Tokyo, 1000011, JP)
YUASA, Daijiro (JFE STEEL CORPORATION 2-3, Uchisaiwai-cho 2-chome, Chiyoda-k, Tokyo 11, 1000011, JP)
湯浅大二郎 (〒11 東京都千代田区内幸町二丁目２番３号ＪＦＥスチール株式会社 知的財産部内 Tokyo, 1000011, JP)
井上智弘 (〒11 東京都千代田区内幸町二丁目２番３号ＪＦＥスチール株式会社 知的財産部内 Tokyo, 1000011, JP)
SAKASHITA, Shigeto (JFE STEEL CORPORATION 2-3, Uchisaiwai-cho 2-chome, Chiyoda-k, Tokyo 11, 1000011, JP)
坂下重人 (〒11 東京都千代田区内幸町二丁目２番３号ＪＦＥスチール株式会社 知的財産部内 Tokyo, 1000011, JP)
YUASA, Daijiro (JFE STEEL CORPORATION 2-3, Uchisaiwai-cho 2-chome, Chiyoda-k, Tokyo 11, 1000011, JP)
湯浅大二郎 (〒11 東京都千代田区内幸町二丁目２番３号ＪＦＥスチール株式会社 知的財産部内 Tokyo, 1000011, JP)
Application Number:
JP2008/052592
Publication Date:
August 21, 2008
Filing Date:
February 08, 2008
Export Citation:
Assignee:
JFE STEEL CORPORATION (2-3 Uchisaiwai-cho 2-chome, Chiyoda-ku Tokyo, 11, 1000011, JP)
ＪＦＥスチール株式会社 (〒11 東京都千代田区内幸町二丁目２番３号 Tokyo, 1000011, JP)
INOUE, Tomohiro (JFE STEEL CORPORATION 2-3, Uchisaiwai-cho 2-chome, Chiyoda-k, Tokyo 11, 1000011, JP)
井上智弘 (〒11 東京都千代田区内幸町二丁目２番３号ＪＦＥスチール株式会社 知的財産部内 Tokyo, 1000011, JP)
SAKASHITA, Shigeto (JFE STEEL CORPORATION 2-3, Uchisaiwai-cho 2-chome, Chiyoda-k, Tokyo 11, 1000011, JP)
坂下重人 (〒11 東京都千代田区内幸町二丁目２番３号ＪＦＥスチール株式会社 知的財産部内 Tokyo, 1000011, JP)
YUASA, Daijiro (JFE STEEL CORPORATION 2-3, Uchisaiwai-cho 2-chome, Chiyoda-k, Tokyo 11, 1000011, JP)
ＪＦＥスチール株式会社 (〒11 東京都千代田区内幸町二丁目２番３号 Tokyo, 1000011, JP)
INOUE, Tomohiro (JFE STEEL CORPORATION 2-3, Uchisaiwai-cho 2-chome, Chiyoda-k, Tokyo 11, 1000011, JP)
井上智弘 (〒11 東京都千代田区内幸町二丁目２番３号ＪＦＥスチール株式会社 知的財産部内 Tokyo, 1000011, JP)
SAKASHITA, Shigeto (JFE STEEL CORPORATION 2-3, Uchisaiwai-cho 2-chome, Chiyoda-k, Tokyo 11, 1000011, JP)
坂下重人 (〒11 東京都千代田区内幸町二丁目２番３号ＪＦＥスチール株式会社 知的財産部内 Tokyo, 1000011, JP)
YUASA, Daijiro (JFE STEEL CORPORATION 2-3, Uchisaiwai-cho 2-chome, Chiyoda-k, Tokyo 11, 1000011, JP)
International Classes:
B23K13/00; B21C37/08; B21C37/083; B21C51/00; B23K13/08; B21D19/04; G01B11/24
Attorney, Agent or Firm:
OCHIAI, Kenichiro (JFE Techno-Research Corporation7th Floor, Yanagiya Building,1-10, Nihonbashi 2-chom, Chuo-ku Tokyo 27, 1030027, JP)