Title:
METHOD FOR MANUFACTURING ELECTRIC RESISTANCE WELDED STEEL TUBE
Document Type and Number:
Japanese Patent JP2006289446
Kind Code:
A
Abstract:
To provide a method for manufacturing an electric resistance welded steel tube, by which the quality of a welded part is stabilized.
An SG rolls 4, which has a left and right bisected structure and can freely change a fin width, are provided before an SQ roll. When the outer diameter of a steel tube to be made is changed, a fin width D is changed so as to proportion to the outer diameter of the steel tube, so that the cross section shape of the tube is stabilized during welding operation without exchanging a roll. When thickness or strength changes, a V angle is positively changed by adjusting the fin width D, so that the quality of the welded part is stabilized by always welding the tube with an ideal V angle.
Inventors:
FUKUSHI TAKASATO
TAKASHIMA FUTOSHI
KAWAMURA KEIZO
HIROSHIGE ITSURO
TAKASHIMA FUTOSHI
KAWAMURA KEIZO
HIROSHIGE ITSURO
Application Number:
JP2005114327A
Publication Date:
October 26, 2006
Filing Date:
April 12, 2005
Export Citation:
Assignee:
NIPPON STEEL CORP
International Classes:
B21C37/08; B23K13/00; B23K101/06; B23K103/04
Domestic Patent References:
| JPS5364654A | 1978-06-09 | |||
| JPS61172677A | 1986-08-04 | |||
| JP2002192223A | 2002-07-10 |
Attorney, Agent or Firm:
Koji Hagiwara
Tetsuo Kanamoto
Miaki Kametani
Tetsuo Kanamoto
Miaki Kametani