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    TACK WELDING METHOD IN PRODUCTION PROCESS FOR LARGE-DIAMETER WELDED STEEL PIPE OR TUBE
    4.
    发明公开
    TACK WELDING METHOD IN PRODUCTION PROCESS FOR LARGE-DIAMETER WELDED STEEL PIPE OR TUBE 审中-公开
    问题的焊接工艺进行生产焊接钢管或管线大口径的

    公开(公告)号：EP3132879A4

    公开(公告)日：2017-04-26

    申请号：EP15780550

    申请日：2015-04-15

    Applicant: JFE STEEL CORP

    Inventor： HAYAKAWA NAOYA ,  TAMURA YUKUYA ,  MORIMOTO YUTA

    IPC: B23K9/173 ,  B21C37/08 ,  B23K9/025 ,  B23K9/032 ,  B23K9/235 ,  B23K101/06

    CPC classification number: B21C37/08 ,  B23K9/0253 ,  B23K9/0325 ,  B23K9/173 ,  B23K9/235 ,  B23K2201/06

    Abstract: Provided is a tack welding method that, in welding of a large-diameter welded steel pipe or tube, enables an increase in welding speed while preventing humped beads, burn through, and incomplete fusion. In the tack welding method, tack welding is performed continuously on edges (1a) of an open pipe or tube (1) in a production process for a large-diameter welded steel pipe or tube. The tack welding is performed by gas metal arc welding in which a welding current of 1000 A or greater is supplied to a solid welding wire (3) of 4.8 mm or greater in diameter that is attached to contact tip (2), while maintaining a distance of 25 mm or greater between an outer surface of the edges (1a) and a lower end of the contact tip (2).

    Abstract translation: 本发明提供一种粘性焊接方法是，在大直径的焊接钢管的焊接，能够增加在焊接速度，同时防止隆起珠，烧穿，和未熔合。 在点焊方法，点焊是在生产过程中连续地执行在一个开放的管或管（1）的边缘（1a），用于大直径的焊接钢管。 钉焊接通过气体金属电弧在哪个焊接1000或更大的焊接电流被提供给实心焊丝（3）为4.8毫米或更大的直径并连接到接触尖端（2）进行的，同时保持 的在边缘处的外表面（1a）的25mm或更大之间的距离和接触尖端的下端（2）。

    SUBMERGED ARC WELDING METHOD WITH MULTIPLE ELECTRODES FOR STEEL MATERIAL
    5.
    发明公开
    SUBMERGED ARC WELDING METHOD WITH MULTIPLE ELECTRODES FOR STEEL MATERIAL 有权
    麻醉师麻醉师ELEKTRODENFÜRSTAHLMATERIAL

    公开(公告)号：EP2255915A4

    公开(公告)日：2014-08-13

    申请号：EP09713534

    申请日：2009-02-19

    Applicant: JFE STEEL CORP

    Inventor： ISHIGAMI ATSUSHI ,  OI KENJI ,  HAYAKAWA NAOYA

    IPC: B23K9/18 ,  B23K9/00 ,  B23K9/025 ,  B23K9/032 ,  B23K101/06

    CPC classification number: B23K9/188 ,  B23K9/0253 ,  B23K9/0282 ,  B23K2201/06 ,  B23K2203/04

    Abstract: Provided is a multiple-electrode submerged arc welding method, for steel, suitable for welding in the manufacture of large-diameter steel pipes, such as UOE steel pipes or spiral steel pipes, formed of base materials ranging in thickness from 10 to 50 mm. Specifically, steel is subjected to multiple-electrode submerged arc welding with three or more electrodes in which a direct-current power source is used to supply current to a first electrode, the welding by the first electrode is carried out at a current density of 250 A/mm 2 or more, preferably with a wire diameter of 3.2 mm or less and a weld current of 1,000 A or more, the welding by the second electrode is carried out at a current density of 150 A/mm 2 or more, preferably with a weld current of 600 A or more, one of the interelectrode spacings is 23 mm or more on a surface of the steel, and the remaining interelectrode spacings are 20 mm or less.

    Abstract translation: 本发明提供一种多电极埋弧焊接方法，适用于制造厚度为10〜50mm的基材的UOE钢管或螺旋钢管等大口径钢管的焊接。 具体地说，将钢用三电极或多层电极进行多电极埋弧焊，其中使用直流电源向第一电极供电，第一电极的焊接以250的电流密度进行 A / mm 2以上，优选线径为3.2mm以下，焊接电流为1000A以上，第二电极的焊接以150A / mm 2以上的电流密度进行，优选 在焊接电流为600A以上的情况下，电极表面之间的电极间间隔为23mm以上，其余的电极间间隔为20mm以下。

    MULTI-ELECTRODE SUBMERGED ARC WELDING METHOD, WELDED JOINT, AND METHOD FOR MANUFACTURING SAME
    6.
    发明公开
    MULTI-ELECTRODE SUBMERGED ARC WELDING METHOD, WELDED JOINT, AND METHOD FOR MANUFACTURING SAME 审中-公开

    公开(公告)号：EP3308895A4

    公开(公告)日：2018-07-11

    申请号：EP16807126

    申请日：2016-06-08

    Applicant: JFE STEEL CORP

    Inventor： KOZUKI SHOHEI ,  HAYAKAWA NAOYA ,  OI KENJI

    IPC: B23K9/18 ,  B23K9/095

    CPC classification number: B23K9/18 ,  B23K9/095 ,  B23K9/184 ,  B23K9/188

    Abstract: A multi-electrode submerged arc welding method using a plurality of electrodes is provided. For each of a second electrode to an nth electrode except a first electrode that is a front electrode in a welding direction where n is an integer of 2 or more: a welding power supply capable of controlling a waveform of a welding current is used; and when a maximum value of an electromagnetic force F i acting on an arc column at a wire tip of an ith electrode during welding is denoted by F imax in N/m, an average value of the electromagnetic force F i is denoted by F iave in N/m, and a standard deviation of the electromagnetic force F i is denoted by à Fi in N/m, welding is performed so that F imax, F iave , and à Fi satisfy relationships in Expressions (1) and (2).

    SUBMERGED ARC WELDING METHOD FOR STEEL SHEETS
    7.
    发明公开
    SUBMERGED ARC WELDING METHOD FOR STEEL SHEETS 有权
    UP焊接工艺钢板

    公开(公告)号：EP2786830A4

    公开(公告)日：2016-04-20

    申请号：EP12853275

    申请日：2012-11-28

    Applicant: JFE STEEL CORP

    Inventor： ISHIGAMI ATSUSHI ,  HAYAKAWA NAOYA ,  YANO KOJI

    IPC: B23K9/18 ,  B23K33/00

    CPC classification number: B23K9/188 ,  B23K33/006 ,  B23K2201/06 ,  B23K2203/04

    Abstract: The present invention provides a submerged arc welding method capable of an attempt to enhance toughness of a welded zone with low heat input and an attempt to decrease a weld reinforcement height by suppressing excessive melting of a wire, and capable of achieving a deep depth of penetration and a wide bead width. In the submerged arc welding method, a first electrode at the head in a welding direction has a wire diameter of 2.0 to 3.2 mm and a current density of 145 A/mm 2 or more, second and subsequent electrodes are arranged behind the first electrode in a line, and a groove formed in a steel plate has a two-step groove shape satisfying ¸ B

    METHOD OF BUTT WELDING STEEL PLATES AND BUTT WELD JOINT OF STEEL PLATES
    10.
    发明公开
    METHOD OF BUTT WELDING STEEL PLATES AND BUTT WELD JOINT OF STEEL PLATES 审中-公开
    VERFAHREN ZUM STUMPFSCHWEISSEN VON STAHLPLATTEN UND STUMPFSCHWEISSNAHT VON STAHLPLATTEN

    公开(公告)号：EP3162489A4

    公开(公告)日：2017-06-07

    申请号：EP15814944

    申请日：2015-06-25

    Applicant: JFE STEEL CORP

    Inventor： KOZUKI SHOHEI ,  HAYAKAWA NAOYA ,  OI KENJI

    IPC: B23K28/02 ,  B23K9/18 ,  B23K26/21 ,  C22C38/00 ,  C22C38/14

    CPC classification number: B23K9/18 ,  B23K26/21 ,  B23K28/02 ,  C22C38/00 ,  C22C38/14

    Abstract: A method of butt welding steel plates includes: butting two steel plates (1) together, to form a Y groove having an opening portion (2) in an upper part and a root face portion (3) in a lower part; joining the two steel plates at the opening portion (2) of the Y groove by submerged arc welding, to form submerged arc weld metal (4) whose Ti content is 0.030 mass% to 0.100 mass%, B content is 0.0030 mass% to 0.0080 mass%, and [%Al]/[%O] is in a range of 0.5 to 1.2 where [%Al] is Al content in mass% and [%O] is O content in mass%; and joining the two steel plates at the root face portion (3) of the Y groove by laser welding, to form laser weld metal (5) so that the laser weld metal (5) enters into the submerged arc weld metal (4).

    Abstract translation: 一种对接焊接钢板的方法，包括：将两块钢板（1）对接在一起，以形成在上部具有开口部分（2）并在下部具有根部面部分（3）的Y槽; 通过埋弧焊接在Y槽的开口部（2）接合两块钢板，从而形成Ti含量为0.030质量％〜0.100质量％的埋弧焊金属（4），B含量为0.0030质量％〜0.0080质量％ 质量％，[％Al] / [％O]为0.5〜1.2，其中[％Al]为Al含量以质量％计，[％O]以质量％计为O含量。 并且通过激光焊接在Y槽的根部面部分（3）处接合两个钢板以形成激光焊接金属（5），使得激光焊接金属（5）进入埋弧焊接金属（4）。

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