公开(公告)号：CA2679123C

公开(公告)日：2015-11-24

申请号：CA2679123

申请日：2007-05-18

Applicant: JFE STEEL CORP

Inventor： IIZUKA YUKINORI ,  KENMOCHI KAZUHITO ,  YOKOYAMA HIROYASU ,  INOUE TOMOHIRO ,  SAKASHITA SHIGETO

IPC: G01N29/30 ,  G01N29/04 ,  G01N29/44

Abstract: Ultrasonic flaw detection at the welded portion (2) of a tubular body (1) is performed at least in the axial direction of the tubular body, a defect judgment threshold is determined based on the difference of signal strength between the total area of defects existing in the region of an ultrasonic beam on the welded surface and an artificial defect, and then quality control of the tubular body is performed by the defect judgment threshold. From the defect density on the welded surface at the welded portion in the axial direction of tubular body determined from a desired quality level and the area of the ultrasonic beam on the welded surface, an equivalent defect diameter is determined based on the total area of defects existing in the region of the ultrasonic beam and then the defect judgment threshold is determined based on the difference of signal strength between the equivalent defect diameter and the artificial defect.

公开(公告)号：CA2677770C

公开(公告)日：2015-04-07

申请号：CA2677770

申请日：2008-02-08

Applicant: JFE STEEL CORP

Inventor： INOUE TOMOHIRO ,  SAKASHITA SHIGETO ,  YUASA DAIJIRO ,  YOKOYAMA HIROYASU ,  KENMOCHI KAZUHITO ,  IIZUKA YUKINORI

IPC: B23K13/00 ,  B21C37/08 ,  B21C37/083 ,  B21C51/00 ,  B21D19/04 ,  B23K13/08 ,  G01B11/24

Abstract: A method for manufacturing an electric resistance steel pipe having a good toughness at a welded portion is provided, the method being capable of stably manufacturing an electric resistance welded steel pipe having a desirable toughness at a welded portion although a steel strip serving as a base material has a dimensional variation. Groove shapes 5a and 5b are applied to edges 4a and 4b of an open pipe 4, an edge shape monitor 11 continuously captures images of the edges 4a and 4b immediately before electric resistance welding, and the captured images are input to an arithmetic processing unit 14 for image processing. Thus, a groove height h is measured, an optimum welding electric power is calculated on the basis of the measurement result, and the welding electric power from electric power generating equipment 6 is adjusted. Furthermore, an ultrasonic flaw detector 15 continuously measures an oxide distribution at the welded portion after the electric resistance welding. The optimum welding electric power is calculated on the basis of the measurement result, and the welding electric power from the welding power generating equipment 6 is adjusted.

公开(公告)号：CA2679293C

公开(公告)日：2013-12-10

申请号：CA2679293

申请日：2007-05-18

Applicant: JFE STEEL CORP

Inventor： IIZUKA YUKINORI ,  KENMOCHI KAZUHITO ,  YOKOYAMA HIROYASU ,  INOUE TOMOHIRO ,  SAKASHITA SHIGETO

IPC: G01N29/04 ,  G01N29/44

Abstract: The present invention has a structure capable of detecting the scattered-type penetrator having oxides each with the size of several m sparsely and widely dispersed. Specifically, the structure includes a wave transmission unit 6 for transmitting an ultrasonic wave to the welded surface of the welded portion 2 in a pipe axial direction of the pipe 1 such that the beam width of a transmission beam 8 is brought into a range from 0.5 mm to 2.5 mm, and a wave reception unit 7 for receiving at least a portion of the reflection wave (reception beam 9) at the welded surface. The wave transmission unit 6 and the wave reception unit 7 include transmission/reception units formed of different groups of transducer elements on at least one or more array probes 5 arranged in the circumferential direction of the pipe.

公开(公告)号：CA2679123A1

公开(公告)日：2008-09-04

申请号：CA2679123

申请日：2007-05-18

Applicant: JFE STEEL CORP

Inventor： YOKOYAMA HIROYASU ,  INOUE TOMOHIRO ,  IIZUKA YUKINORI ,  KENMOCHI KAZUHITO ,  SAKASHITA SHIGETO

IPC: G01N29/30 ,  G01N29/04 ,  G01N29/44

Abstract: Ultrasonic flaw detection at the welded portion (2) of a tubular body (1) is performed at least in the axial direction of the tubular body, a defect judgment threshold is determined based on the difference of signal strength between the total area of defects existing in the region of an ultrasonic be am on the welded surface and an artificial defect, and then quality control of the tubular body is performed by the defect judgment threshold. From the defect density on the welded surface at the welded portion in the axial dire ction of tubular body determined from a desired quality level and the area o f the ultrasonic beam on the welded surface, an equivalent defect diameter i s determined based on the total area of defects existing in the region of th e ultrasonic beam and then the defect judgment threshold is determined based on the difference of signal strength between the equivalent defect diameter and the artificial defect.

公开(公告)号：CA2677770A1

公开(公告)日：2008-08-21

申请号：CA2677770

申请日：2008-02-08

Applicant: JFE STEEL CORP

Inventor： IIZUKA YUKINORI ,  YOKOYAMA HIROYASU ,  YUASA DAIJIRO ,  SAKASHITA SHIGETO ,  KENMOCHI KAZUHITO ,  INOUE TOMOHIRO

IPC: B23K13/00 ,  B21C37/08 ,  B21C37/083 ,  B21C51/00 ,  B21D19/04 ,  B23K13/08 ,  G01B11/24

Abstract: A method for stably manufacturing a seam-welded steel pipe whose welded p ortion 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 di stribution 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 weldi ng power generating device (6) can be adjusted.

公开(公告)号：EP3168613A4

公开(公告)日：2018-02-28

申请号：EP15819577

申请日：2015-07-01

Applicant: JFE STEEL CORP

Inventor： MATSUI YUTAKA ,  SAKASHITA SHIGETO ,  YONEMOTO ATSUSHI

IPC: G01N29/265 ,  B23K11/25 ,  B23K31/12 ,  G01N29/22

CPC classification number: G01N29/265 ,  B23K11/25 ,  B23K31/125 ,  G01N29/223 ,  G01N2291/2675

Abstract: An ultrasonic flaw detection apparatus 1 includes: a ultrasonic flaw detection sensor head 11 installed downstream from a seam detection unit 13; a seam position calculation unit 14a that calculates a seam position and a bead cutting position of an electric resistance welded pipe P by using a thermal image of a welded seam portion captured by the seam detection unit 13; a bead cutting band detection unit 15 that is installed immediately before or immediately after the ultrasonic flaw detection sensor head 11 and that detects a bead cutting band of the electric resistance welded pipe P; a bead cutting position calculation unit 14c that calculates, based on the bead cutting band detected by the bead cutting band detection unit 15, a bead cutting position of the electric resistance welded pipe P; and a tracking movement amount calculation unit 14d that calculates a tracking movement amount of the ultrasonic flaw detection sensor head 11 by using the seam position and bead cutting position calculated by the seam position calculation unit 14a and the bead cutting position calculated by the bead cutting position calculation unit 14c.

公开(公告)号：EP2116847A4

公开(公告)日：2014-07-09

申请号：EP07744086

申请日：2007-05-18

Applicant: JFE STEEL CORP

Inventor： IIZUKA YUKINORI ,  KENMOCHI KAZUHITO ,  YOKOYAMA HIROYASU ,  INOUE TOMOHIRO ,  SAKASHITA SHIGETO

IPC: G01N29/30 ,  G01N29/04 ,  G01N29/11 ,  G01N29/44

CPC classification number: G01N29/30 ,  G01N29/11 ,  G01N2291/02854 ,  G01N2291/0289 ,  G01N2291/044 ,  G01N2291/2675

公开(公告)号：EP2322312A4

公开(公告)日：2015-05-27

申请号：EP09770280

申请日：2009-06-22

Applicant: JFE STEEL CORP

Inventor： YANO KOJI ,  OI KENJI ,  SUZUKI MASAHITO ,  KODAMA TOSHIFUMI ,  SAKASHITA SHIGETO

IPC: B23K26/26 ,  B23K26/03 ,  B23K101/06

CPC classification number: B23K26/1429 ,  B23K26/03 ,  B23K26/032 ,  B23K26/262 ,  B23K2201/06 ,  B23K2201/10 ,  B23K2203/04

Abstract: There is provided a method for manufacturing a laser welded steel pipe in which the status of laser welding is accurately assessed, and the assessment is used to modify welding conditions, so that laser welded steel pipes can be manufactured at a high yield rate and in a stable manner. More specifically, irradiation point(s) of laser beam(s), with which the longitudinal edges are irradiated from the side of the outer surface, are monitored from the side of the inner surface of an open pipe, and then conditions of welding with the laser beam(s) are assessed to be kept unchanged if any keyhole is found penetrating out of the inner surface of the open pipe, or modified if no keyhole is found penetrating out of the inner surface of the open pipe, so that welding can be performed with any keyhole penetrating from the outer surface to the inner surface of the open pipe captured at any irradiation point of the laser beam(s) .

公开(公告)号：EP2123389A4

公开(公告)日：2015-04-08

申请号：EP08711419

申请日：2008-02-08

Applicant: JFE STEEL CORP

Inventor： INOUE TOMOHIRO ,  SAKASHITA SHIGETO ,  YUASA DAIJIRO ,  YOKOYAMA HIROYASU ,  KENMOCHI KAZUHITO ,  IIZUKA YUKINORI

IPC: B23K11/08 ,  B21C37/083 ,  B21C51/00 ,  B23K11/25 ,  B23K11/34 ,  B23K33/00 ,  G01B11/25

CPC classification number: G01B11/25 ,  B21C37/08 ,  B21C37/0826 ,  B21C37/083 ,  B23K11/0873 ,  B23K11/252 ,  B23K11/34 ,  B23K33/006 ,  B23K2201/06 ,  B23K2203/04

公开(公告)号：EP2124046A4

公开(公告)日：2014-12-03

申请号：EP07744097

申请日：2007-05-18

Applicant: JFE STEEL CORP

Inventor： IIZUKA YUKINORI ,  KENMOCHI KAZUHITO ,  YOKOYAMA HIROYASU ,  INOUE TOMOHIRO ,  SAKASHITA SHIGETO

IPC: G01N29/04 ,  G01N29/06 ,  G01N29/265 ,  G01N29/44

CPC classification number: G01N29/265 ,  G01N29/043 ,  G01N29/0645 ,  G01N29/449 ,  G01N2291/044 ,  G01N2291/056 ,  G01N2291/106 ,  G01N2291/2634 ,  G01N2291/2675 ,  Y10T29/49764 ,  Y10T29/49769 ,  Y10T29/49771

Abstract: According to the present invention, penetrators can be adequately determined as flaws. In particular, a welded zone 2 of a pipe 1 is subjected to ultrasonic flaw detection at least in a pipe axial direction, and the quality of the pipe is evaluated using observed values in units of a predetermined area in a pipe thickness direction and the pipe axial direction. The length of one side of the predetermined area is an ultrasound beam width or more and a pipe thickness or less. The quality of the pipe can be evaluated while shifting the predetermined area in the pipe axial direction by using an average value of the observed values within the predetermined area. The length of one side of the predetermined area can be made an ultrasound beam width or more and a pipe thickness or less.