APPARATUS FOR HEATING THE WELDED PORTION OF STEEL PIPE MATERIAL, AND METHOD FOR THE APPARATUS

WIPO Patent Application WO/2009/060764

A1

This aims to provide a method for heating the welded portion of a steel pipe material so as to melt and pressure-weld the welded portion, and an apparatus for the method. When the moving steel pipe material is continuously induction-heated and welded as a heating object, the temperature of the welded portion, the shape of the welded steel and the welding frequency fluctuation are controlled highly precisely and highly efficiently irrespective of the shape of the heated portion of the heating object or the material of the heating object. The welded portion heating method comprises a first imaging step of detecting the spontaneous light of the welded portion by first imaging means (3) arranged to confront the welded portion of the end face of the steel pipe material, thereby to output a brightness image, a welded portion temperature-distribution computing step of treating the image on the basis of the brightness image, thereby to compute the thickness-direction temperature distribution of the welded portion by a radiant-light temperature measurement, a heating control step of deciding the frequency of an AC electric current on the basis of the thickness-direction temperature distribution by using an evaluation reference of the relation between the frequency of a preset AC electric current and a thickness-direction temperature distribution, and a step of feeding the AC electric current of the frequency decided at the heating control step, to the steel pipe material (10) by using an AC power source (1) of a variable frequency.

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JP2012016749	ELECTRO-RESISTANCE-WELDED TUBE WELDING EQUIPMENT

FUKUTANI, Kazuhiko (6-3 Otemachi 2-chome, Chiyoda-k, Tokyo 71, 1008071, JP)
福谷和彦 (〒71 東京都千代田区大手町二丁目６番３号新日本製鐵株式会社内 Tokyo, 1008071, JP)
UMETSU, Kenji (6-3 Otemachi 2-chome, Chiyoda-k, Tokyo 71, 1008071, JP)
梅津健司 (〒71 東京都千代田区大手町二丁目６番３号新日本製鐵株式会社内 Tokyo, 1008071, JP)
NAKAMURA, Yoshiaki (6-3 Otemachi 2-chome, Chiyoda-k, Tokyo 71, 1008071, JP)
中村良昭 (〒71 東京都千代田区大手町二丁目６番３号新日本製鐵株式会社内 Tokyo, 1008071, JP)
YAMAMOTO, Kazuto (6-3 Otemachi 2-chome, Chiyoda-k, Tokyo 71, 1008071, JP)
山本和人 (〒71 東京都千代田区大手町二丁目６番３号新日本製鐵株式会社内 Tokyo, 1008071, JP)

JP2008/069582

May 14, 2009

October 22, 2008

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NIPPON STEEL CORPORATION (6-3 Otemachi 2-chome, Chiyoda-ku Tokyo, 71, 1008071, JP)
新日本製鐵株式会社 (〒71 東京都千代田区大手町二丁目６番３号 Tokyo, 1008071, JP)
FUKUTANI, Kazuhiko (6-3 Otemachi 2-chome, Chiyoda-k, Tokyo 71, 1008071, JP)
福谷和彦 (〒71 東京都千代田区大手町二丁目６番３号新日本製鐵株式会社内 Tokyo, 1008071, JP)
UMETSU, Kenji (6-3 Otemachi 2-chome, Chiyoda-k, Tokyo 71, 1008071, JP)
梅津健司 (〒71 東京都千代田区大手町二丁目６番３号新日本製鐵株式会社内 Tokyo, 1008071, JP)
NAKAMURA, Yoshiaki (6-3 Otemachi 2-chome, Chiyoda-k, Tokyo 71, 1008071, JP)
中村良昭 (〒71 東京都千代田区大手町二丁目６番３号新日本製鐵株式会社内 Tokyo, 1008071, JP)
YAMAMOTO, Kazuto (6-3 Otemachi 2-chome, Chiyoda-k, Tokyo 71, 1008071, JP)

B23K13/08; B23K13/00; B23K13/02; H05B3/00; H05B6/06; H05B6/10

AOKI, Atsushi et al. (SEIWA PATENT & LAW, Toranomon 37 Mori Bldg. 5-1,Toranomon 3-chome, Minato-k, Tokyo 23, 1058423, JP)

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