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    RESISTANCE SPOT-WELDED JOINT AND METHOD FOR PRODUCING SAME
    2.
    发明公开
    RESISTANCE SPOT-WELDED JOINT AND METHOD FOR PRODUCING SAME 审中-实审

    公开(公告)号：EP4434667A1

    公开(公告)日：2024-09-25

    申请号：EP23774279.6

    申请日：2023-02-08

    申请人： JFE Steel Corporation

    发明人： KAWABE, Nao ,  KIM, Jingeum ,  TAKASHIMA, Katsutoshi ,  MATSUDA, Hiroshi

    IPC分类号： B23K11/11 ,  B23K11/16 ,  B23K11/24 ,  C22C21/02

    CPC分类号： B23K11/11 ,  B23K11/16 ,  C22C21/02 ,  B23K11/24

    摘要： It is an object to provide a resistance spot welded joint and a method for producing the welded joint. The resistance spot welded joint of the invention includes two or more steel sheets including at least one steel sheet having a tensile strength of 980 MPa or more. The largest total area fraction of tempered martensite, tempered bainite, and retained austenite in a steel sheet microstructure of a steel sheet among the total area fractions in the steel sheets is defined as Xmax, and a region in the heat-affected zone of the resistance spot weld formed in the steel sheet with Xmax is defined as a first region. The heat-affected zone microstructure in the first region includes ferrite at an area fraction of 40% or less and one or two or more remaining microstructures selected from tempered martensite, tempered bainite, and retained austenite, and the first region has a width D (mm) satisfying formula (1). D≥2.40×exp−0.025×Xmax

    WELDING TRANSFORMER
    5.
    发明公开
    WELDING TRANSFORMER 审中-公开

    公开(公告)号：EP3477840A1

    公开(公告)日：2019-05-01

    申请号：EP18000829.4

    申请日：2018-10-25

    申请人： Univerza v Mariboru, Fakulteta za elektrotehniko, racunalnistvo in informatiko

    发明人： Brezovnik, Robert ,  Dolinar, Drago ,  Petrun, Martin ,  Ritonja, Jozef ,  Truntic, Mitja

    IPC分类号： H02M3/335 ,  B23K9/09 ,  H01F27/28 ,  H01F38/08 ,  B23K9/10 ,  B23K11/24 ,  H02M1/00

    CPC分类号： H02M3/335 ,  B23K11/11 ,  B23K11/241 ,  H01F27/40 ,  H01F38/085 ,  H01F2027/408 ,  H02M3/33592 ,  H02M2001/0064

    摘要： The invention solves the technical problem of the too long connections between the output from the secondary winding and an output rectifier also reducing the need for intensive cooling of rectifier means by integrating the rectifier means in the form of power diodes or MOSFET transistors into the parts of the secondary winding, where the arrangement is not more complex compared to the conventional solutions, however, it enables substantially shorter output connections. The proposed modified structure changes the electrical parameters of the welding system in such a way that, despite the required unchanged maximum value of the welding current and the use of rectifier means in the form of power diodes or MOSFET transistors, it is possible to further reduce electrical losses in secondary connections that become shorter, while simplifying also the cooling of rectifier means in the form of power diode or MOSFET transistors, which, with the proposed integration of secondary windings with output rectifier means in the form of power diode or MOSFET transistors, is cooled indirectly simultaneously with the cooling of the secondary winding. The proposed embodiment allows a significant increase in the power density of the welding transformer with an output rectifier. Because of the change in the electrical properties of the secondary part of the system, it is also possible to operate at slightly higher frequencies than 1 kHz, without parallelizing the secondary winding.

    VERFAHREN ZUM VERSCHWEISSEN VON BLECHZUSCHNITTEN
    6.
    发明公开
    VERFAHREN ZUM VERSCHWEISSEN VON BLECHZUSCHNITTEN 审中-公开

    公开(公告)号：EP3391987A1

    公开(公告)日：2018-10-24

    申请号：EP18162930.4

    申请日：2018-03-20

    申请人： Benteler Automobiltechnik GmbH

    发明人： Base, Miroslav ,  Jasansky, Ondrej

    IPC分类号： B23K11/00 ,  B23K11/11 ,  B23K37/04 ,  B23K37/047 ,  B23K26/22 ,  B23Q7/02 ,  B23K101/00 ,  B23K101/18

    CPC分类号： B23K11/11 ,  B23K26/22 ,  B23K37/0408 ,  B23K37/047 ,  B23K2101/185 ,  B23Q7/02

    摘要： Verfahren zum Verschweißen von Blechzuschnitten zu Patchwork Blanks mit folgenden Schritten:
    - Bereitstellen der zu verschweißenden Blechzuschnitte (2, 3) zur Handhabung mittels Handhabungsrobotern (HR1, HR2);
    - Die Handhabungsroboter (HR1, HR2) platzieren einen ersten Blechzuschnitt (2) und wenigstens einen weiteren Blechzuschnitt (3) in einer ausgerichteten Position auf dem ersten Blechzuschnitt (2), wobei die Handhabungsroboter (HR1, HR2) den ersten Blechzuschnitt (2) auf einem Zentriertisch (4) in einer Zentrierposition positionieren, wo er mit dem wenigstens einen weiteren Blechzuschnitt (3) vorfixiert wird;
    - Der wenigstens eine weitere Blechzuschnitt (3) wird mit dem ersten Blechzuschnitt (2) durch Punktschweißen mittels eines ersten Schweißroboters (WR1) vorfixiert;
    - Die vorfixierten Blechbauteile (2, 3) werden mittels eines Handhabungsroboters (HR2) an ein Schweißkarussell (5) übergeben und dort in im wesentlichen vertikaler Position an einem Halter (11) fixiert, wobei an dem Halter (11) wenigstens eine universale Klemmvorrichtung (13) für flache Blechzuschnitte (2, 3) angeordnet ist, wobei die wenigstens eine Klemmvorrichtung (13) die Blechzuschnitte (2, 3) an einem Randbereich umgreift;
    - Das Schweißkarussell (5) führt die vorfixierten Blechbauteile (2, 3) an mehreren Schweißrobotern (WR1, WR2, WR3, WR4) vorbei, um weitere Punktschweißungen auszuführen, wobei ein Be- und Entladen des Schweißkarussells (5) parallel zum Schweißprozess ausgeführt wird;
    - Abschließend erreicht das fertige Patchwork Blank (6) eine Übergabeposition des Schweißkarussells (5), wo es von einem Handhabungsroboter (HR3) entnommen wird.

    METHOD OF ANALYSIS OF A WELDED JOINT MANUFACTURED BY A METHOD OF RESISTANCE SPOT WELDING
    7.
    发明授权
    METHOD OF ANALYSIS OF A WELDED JOINT MANUFACTURED BY A METHOD OF RESISTANCE SPOT WELDING 有权

    公开(公告)号：EP3199289B1

    公开(公告)日：2018-09-12

    申请号：EP17162271.5

    申请日：2012-11-06

    申请人： JFE Steel Corporation

    发明人： TANIGUCHI, Koichi ,  OKITA, Yasuaki ,  IKEDA, Rinsei

    IPC分类号： B23K11/16 ,  B23K11/11

    CPC分类号： B23K11/11 ,  B23K11/115 ,  B23K11/16 ,  Y10T403/478

    摘要： An object of the present invention is to provide a high strength welded joint manufactured by a method of resistance spot welding a sheet set of two or more steel sheets, with which segregation in a nugget and generation of a crack is reduced and thereby interface failure is prevented without reducing the hardness of the welded joint. In a welded joint manufactured by a method of resistance spot welding thin steel sheets, when the diameter of a nugget formed from the thin steel sheets is denoted by d, on a horizontal plane passing through a nugget surrounded by a corona bond, distribution of an amount of P in a region in the nugget surrounded by a closed curve at a distance d/100 from an end portion of a weld zone toward the inside of the nugget and a closed curve at a distance d/5 from the end portion of the weld zone toward the inside of the nugget is analyzed by area analysis, and the proportion of the region in terms of area in which the concentration m (mass %) of P is more than twice the concentration M (mass %) of P of a base metal composition is 5% or less.

    RESISTIVE SPOT-WELDING METHOD
    8.
    发明公开
    RESISTIVE SPOT-WELDING METHOD 审中-公开

    公开(公告)号：EP3366408A1

    公开(公告)日：2018-08-29

    申请号：EP16857581.9

    申请日：2016-10-21

    申请人： Nippon Steel & Sumitomo Metal Corporation

    发明人： FURUSAKO, Seiji

    IPC分类号： B23K11/11 ,  B23K11/16

    CPC分类号： B23K11/11 ,  B23K11/16

    摘要： A resistance spot welding method able to form a welded joint having delayed fracture resistance, comprising, in order, a step of applying a pressing force P1 (kN) to the plurality of steel sheets by welding electrodes while supplying a supplied current I1 (kA), a step of, while applying the pressing force PI, supplying a current Ic (kA) during a cooling time tc (s), a step of repeating two times or more a pressure force raising and lowering cycle of supplying a supplied current 12 (kA) to the welding electrodes while applying a pressing force P2 (kN) to the plurality of steel sheets by the welding electrodes during a pressing time tf (s), then immediately applying a pressing force P3 (kN) during a pressing time ti (s), a step of applying the pressing force P2 during the pressing time tf, and a step of releasing the pressing force and ending the supply of current, satisfying 0≤Ic

    SPOT WELDING METHOD
    9.
    发明公开
    SPOT WELDING METHOD 审中-公开

    公开(公告)号：EP3345711A1

    公开(公告)日：2018-07-11

    申请号：EP16842010

    申请日：2016-09-02

    申请人： NIPPON STEEL & SUMITOMO METAL CORP

    发明人： YOSHINAGA CHISATO ,  MIYAZAKI YASUNOBU ,  HAYASHI KUNIO ,  KAWATA HIROYUKI ,  YASUYAMA MASANORI

    IPC分类号： B23K11/11 ,  B23K11/16 ,  B23K11/24

    CPC分类号： B23K11/11 ,  B23K11/16 ,  B23K11/24

    摘要： The present invention provides a spot welding method for a member to be welded constituted of a plurality of steel sheets that are overlapped with each other at at least a welding zone, in which at least an overlapped face of at least one of the plurality of steel sheets at the welding zone is coated with zinc plating, a total sheet thickness t (mm) of the plurality of steel sheets is 1.35 mm or more, a squeeze time St (seconds) from the time when welding electrodes are brought into contact with the member to be welded to the time when electric current flow for welding starts satisfies "0.020 ‰¤ St", and a hold time Ht (seconds) after welding from the time when electric current flow for welding between the welding electrodes ends to the time when the welding electrodes and the member to be welded are brought out of contact satisfies "0.015t 2 + 0.020 ‰¤ Ht".