公开(公告)号：EP3305459A4

公开(公告)日：2018-07-11

申请号：EP16802765

申请日：2016-05-18

申请人： PANASONIC IP MAN CO LTD

发明人： NAKAGAWA TATSUYUKI ,  MUKAI YASUSHI ,  KAWAMOTO ATSUHIRO ,  FUJIWARA JUNJI ,  MATSUOKA NORIYUKI

IPC分类号： B23K26/21 ,  B23K26/00 ,  B23K26/082 ,  B23K26/244

CPC分类号： B23K26/082 ,  B23K26/0081 ,  B23K26/0626 ,  B23K26/0643 ,  B23K26/0648 ,  B23K26/0884 ,  B23K26/22 ,  B23K26/244 ,  B23K2203/04

摘要： A welding target is irradiated with a laser beam so as to form a beam spot that moves relatively with respect to the welding target along a locus having a spiral shape rotating around a rotation center moving in a welding direction. The welding target is welded using the laser beam irradiated with. While the welding target is irradiated with the laser beam, the welding target is irradiated with the laser beam based on an interval coefficient which is a value indicating an overlapping degree of the locus having the spiral shape in the welding direction.

公开(公告)号：EP3195973A4

公开(公告)日：2018-07-11

申请号：EP15841515

申请日：2015-09-17

申请人： NIPPON STEEL & SUMITOMO METAL CORP

发明人： NAITO YASUAKI ,  MIYAZAKI YASUNOBU

IPC分类号： B23K26/28 ,  B23K26/21 ,  B23K26/244 ,  B23K101/18 ,  B23K103/04

CPC分类号： B23K26/067 ,  B23K26/035 ,  B23K26/0676 ,  B23K26/244 ,  B23K2201/18 ,  B23K2203/04 ,  H01L21/67144 ,  H01S3/0014 ,  H01S3/131

摘要： The present invention has as its object to provide a laser welded joint excellent in joint strength preventing a bead from cracking and comprised of exactly the number of weld beads required for joint strength and a laser welding method for the same in overlay laser welding of steel sheets forming multiple ring-shaped weld beads. The present invention is a laser welded joint excellent in joint strength preventing a bead from cracking and comprised of exactly the number of weld beads required for joint strength in overlay laser welding of steel sheets forming multiple ring-shaped weld beads, produced by a step of overlaying a plurality of metal sheets and forming a first weld bead and a step of firing a laser beam to successively form a further two or more weld beads at the outside of the first weld bead by laser irradiation, the surface hardness of the weld bead increasing from the inside bead to the outside bead.

公开(公告)号：EP3266553A4

公开(公告)日：2018-03-21

申请号：EP16758647

申请日：2016-03-03

申请人： JFE STEEL CORP

发明人： TANIGUCHI KOICHI ,  OKITA YASUAKI ,  IKEDA RINSEI

IPC分类号： B23K11/11 ,  B23K11/16 ,  B23K101/34 ,  B23K103/04

CPC分类号： F16B5/08 ,  B23K11/11 ,  B23K11/16 ,  B23K11/163 ,  B23K2201/34 ,  B23K2203/04

摘要： A resistance spot welding method is provided, which allows a large nugget to be formed while the occurrence of expulsion is prevented. The resistance spot welding method according to the present invention is a method for resistance spot-welding at least two overlapping steel sheets. When an electrode force F after an electric current supply is started changes from an initial electrode force Fi to an electrode force F h (1) while a lapse from the start of the electric current supply is between 20 ms and 80 ms inclusive, a suspension of the electric current supply for from 20 ms to 60 ms inclusive is started. Then the electric current supply is resumed when the electrode force F reaches an electrode force F c (1) .

公开(公告)号：EP3238870A4

公开(公告)日：2018-02-21

申请号：EP15873575

申请日：2015-12-21

申请人： POSCO

发明人： KWON OH-YEOUL ,  PARK HYUN-CHUL ,  KIM JAE-KYOUM ,  LEE WON-GUL

IPC分类号： B23K26/364 ,  B23K26/00 ,  B23K26/06 ,  B23K26/064 ,  B23K26/082 ,  B23K103/04 ,  C21D8/12

CPC分类号： B23K26/364 ,  B23K26/0087 ,  B23K26/06 ,  B23K26/0604 ,  B23K26/064 ,  B23K26/0821 ,  B23K2203/04 ,  C21D8/1294

摘要： Disclosed herein are a method and a device for forming a groove in a surface of a steel sheet. In the method for forming a groove in a surface of a steel sheet, in order to form grooves at a depth of 10% or less of a thickness of the steel sheet in the surface of the steel sheet by irradiating a laser beam, in the case in which laser beams are irradiated from a plurality of laser oscillators to a scan mirror, pass through the scan mirror, and are then irradiated to the surface of the steel sheet, two or more laser beams share one scan mirror with each other to minimize a thermal influence of groove portions at a high line speed of 20mpm or more, thereby accomplishing iron loss improvement characteristics before (after) heat treatment.

公开(公告)号：EP3112076A4

公开(公告)日：2018-01-03

申请号：EP15746888

申请日：2015-02-04

申请人： NIPPON STEEL & SUMITOMO METAL CORP

发明人： FUJIMOTO HIROKI ,  OKADA TOHRU ,  IMAMURA TAKASHI

IPC分类号： B23K26/244 ,  B23K26/28 ,  B23K26/32 ,  B23K101/00 ,  B23K103/04 ,  B62D25/02 ,  B62D25/04 ,  B62D25/20 ,  B62D27/02 ,  C21D1/09

CPC分类号： B23K26/28 ,  B23K26/244 ,  B23K26/32 ,  B23K2201/006 ,  B23K2203/04 ,  B62D25/02 ,  B62D25/04 ,  B62D27/023 ,  C21D1/09

摘要： The present invention has as its object to inhibit fracture due to a HAZ softened part in substantially circular laser lap welding taking the place of resistance spot welding for joining a superposed plurality of steel sheets including a high strength steel sheet. To solve this problem, the inventors discovered lap welding comprising superposing a plurality of steel sheets and firing a laser to form a substantially circular laser weld (1), which lap welding firing the laser in a straight line through an outer edge of the substantially circular laser weld (1) so as to form a hardened part (8) at the steel sheets and thereby suppressing fracture arising from the HAZ softened part.

公开(公告)号：EP3225709A4

公开(公告)日：2017-12-13

申请号：EP15862558

申请日：2015-11-17

申请人： JFE STEEL CORP

发明人： TOYODA SHUNSUKE ,  OKABE TAKATOSHI ,  GOTO SOTA ,  MATSUI YUTAKA ,  YABUMOTO SATORU

IPC分类号： C22C38/00 ,  B21C37/08 ,  B21C51/00 ,  C21D8/02 ,  C21D9/08 ,  C21D9/50 ,  C22C38/14 ,  C22C38/58

CPC分类号： C22C38/16 ,  B21B23/00 ,  B21C37/08 ,  B21C51/00 ,  B23K11/0873 ,  B23K2201/06 ,  B23K2203/04 ,  C21D8/02 ,  C21D9/08 ,  C21D9/50 ,  C22C38/00 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/12 ,  C22C38/14 ,  C22C38/58 ,  F16L9/17

摘要： A resistance welded steel pipe having excellent resistance to leakage under internal pressure and excellent electric resistance weld zone toughness is provided. A hot-rolled steel sheet having a composition containing, in mass %, C: 0.025 to 0.168%, Si: 0.10 to 0.30%, Mn: 0.60 to 1.90%, and one or at least two selected from Ca, Nb, V, and Ti such that Pcm is 0.20 or less is subjected to continuous cold roll forming to obtain a pipe-shaped body. In this case, tapered grooves are formed in the lateral end surface of the steel sheet such that the ratio of the tapered portions to the wall thickness of the steel sheet is 10 to 80%. Then the end surfaces of the pipe-shaped body are butted against each other and subjected to electric resistance welding to thereby obtain a pipe body. Ultrasonic waves are transmitted toward the electric resistance weld surface such that a beam width is within the range of 0.1 to 4.0 mm, and the reflected waves are used for ultrasonic flaw detection using an ultrasonic flaw detector that uses array probes to thereby inspect the soundness of the electric resistance weld zone. After or before the inspection, the electric resistance weld zone is subjected to seam annealing treatment in which the electric resistance weld zone is heated to 850 to 1,150°C and cooled at a cooling rate of 20 to 200°C/s. In the electric resistance

公开(公告)号：EP2667996B1

公开(公告)日：2017-12-13

申请号：EP12701134.4

申请日：2012-01-26

申请人： voestalpine Stahl GmbH

发明人： MIESBAUER, Josef

IPC分类号： B23K9/04 ,  B22D11/128 ,  B23K35/30 ,  C22C9/01 ,  B23K5/18 ,  C23C26/02 ,  F16C13/00 ,  F16C33/12

CPC分类号： B23K9/048 ,  B22D11/1287 ,  B23K5/18 ,  B23K35/30 ,  B23K35/302 ,  B23K2201/04 ,  B23K2201/34 ,  B23K2203/04 ,  B23K2203/22 ,  C22C9/01 ,  C23C26/02 ,  F16C13/00 ,  F16C2223/46

公开(公告)号：EP3128030A4

公开(公告)日：2017-11-29

申请号：EP15773722

申请日：2015-03-26

申请人： JFE STEEL CORP

发明人： YASUDA KYONO ,  MIZUNO DAISUKE ,  NAKAMICHI HARUO ,  ISHIKAWA NOBUYUKI

IPC分类号： C22C38/00 ,  B23K35/30 ,  C21D1/673 ,  C21D8/02 ,  C22C38/16 ,  C22C38/58

CPC分类号： C21D9/46 ,  B23K31/027 ,  B23K35/3073 ,  B23K2201/10 ,  B23K2203/04 ,  C21D1/673 ,  C21D8/0226 ,  C21D8/0263 ,  C21D2211/001 ,  C21D2211/002 ,  C21D2211/005 ,  C21D2211/008 ,  C22C38/00 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/42 ,  C22C38/48 ,  C22C38/50 ,  C22C38/58

摘要： It is an object to provide an API 5L X60 to X70 grade steel material for highly deformable line pipes that exhibits superior HIC resistance in a wet hydrogen sulfide environment with a pH of 5 or more and has a low yield ratio even after coating treatment at 300°C or lower and to provide a method for manufacturing the steel material and a welded steel pipe. The steel material for highly deformable line pipes that has superior strain aging resistance and superior HIC resistance has a specific chemical composition and has a metallographic structure including ferrite, bainite, and martensite-austenite constituent. The area fraction of the martensite-austenite constituent is 0.5 to 5.0%, and the difference in hardness between the ferrite and the bainite is 60 or more in terms of Vickers hardness. Both before strain aging treatment at a temperature of 300°C or lower and after the strain aging treatment, the steel material has a uniform elongation of 9% or more and a yield ratio of 90% or less.

公开(公告)号：EP3246427A4

公开(公告)日：2017-11-22

申请号：EP16761249

申请日：2016-02-18

申请人： JFE STEEL CORP

发明人： GOTO SOTA ,  TOYODA SHUNSUKE ,  OKABE TAKATOSHI

IPC分类号： C22C38/00 ,  C21D8/02 ,  C21D9/08 ,  C21D9/50 ,  C22C38/38 ,  C22C38/58

CPC分类号： C21D8/02 ,  B21C37/08 ,  B23K11/002 ,  B23K11/02 ,  B23K11/0873 ,  B23K11/16 ,  B23K13/025 ,  B23K31/027 ,  B23K2201/06 ,  B23K2201/18 ,  B23K2203/04 ,  C21D8/105 ,  C21D9/08 ,  C21D9/50 ,  C21D2211/005 ,  C22C38/00 ,  C22C38/02 ,  C22C38/20 ,  C22C38/22 ,  C22C38/24 ,  C22C38/26 ,  C22C38/28 ,  C22C38/30 ,  C22C38/38 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/52 ,  C22C38/58 ,  F16L9/17

摘要： There is provided a high-strength electric resistance welded steel pipe having excellent bendability. The electric resistance welded steel pipe includes a composition containing, on a mass% basis, C: 0.04% to 0.15%, Si: 0.10% to 0.50%, Mn: 1.0% to 2.2%, P: 0.050% or less, S: 0.005% or less, Cr: 0.2% to 1.0%, Ti: 0.005% to 0.030%, and Al: 0.010% to 0.050%, the balance being Fe and unavoidable impurities, and a microstructure including polygonal ferrite with a volume fraction of 70% or more and retained austenite with a volume fraction of 3% to 20%, the balance being at least one selected from martensite, bainite, and pearlite, wherein the polygonal ferrite has an average grain size of 5 µm or more and an aspect ratio of 1.40 or less.

公开(公告)号：EP3096916A4

公开(公告)日：2017-11-22

申请号：EP15739795

申请日：2015-01-26

申请人： ELECTRIC POWER RES INST

发明人： SIEFERT JOHN ALBERT ,  PARKER JONATHAN DAVID

IPC分类号： B23K9/00 ,  B23K9/032 ,  B23K33/00

CPC分类号： B23K9/232 ,  B23K9/02 ,  B23K33/004 ,  B23K2203/04 ,  F16B5/08

摘要： A weld with a stepped configuration is provided. The stepped configuration may be machined from a substrate to form a weld preparation which may accommodate a stepped weld. The weld with a stepped configuration and a controlled procedure exhibits improved service life and improved damage tolerance. A welded joint with a stepped configuration, a joined component with a stepped configuration, and method of welding a stepped configuration are also provided.