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    WELDED JOINT
    7.
    发明公开
    WELDED JOINT 审中-实审

    公开(公告)号：EP4414476A1

    公开(公告)日：2024-08-14

    申请号：EP23747034.9

    申请日：2023-01-26

    申请人： NIPPON STEEL CORPORATION

    发明人： URANAKA, Masaaki ,  MITSUNOBU, Takuya ,  MATSUBA, Masahiro ,  NAKAMURA, Toyomitsu

    IPC分类号： C23C2/06 ,  B23K9/23 ,  B23K26/322 ,  B23K35/30 ,  C22C18/04 ,  C22C21/10 ,  C23C2/12 ,  C23C2/26

    CPC分类号： B23K9/23 ,  B23K26/322 ,  B23K35/30 ,  C22C18/04 ,  C22C21/10 ,  C23C2/06 ,  C23C2/12 ,  C23C2/26

    摘要： To further improve corrosion resistance in the vicinity of a toe.
    A welded joint according to the present invention includes: a first steel sheet and a second steel sheet; and a weld bead zone formed by arc welding or laser welding, wherein at least one of the first steel sheet or the second steel sheet has a plating layer formed by a predetermined component and an oxide layer located on the plating layer in a non-heat-affected zone, and in a region from a position orthogonal to an extension direction of the weld bead zone from the toe and 1 mm in a direction separating from the toe to a position orthogonal to the extension direction from the toe and 2 mm in the direction separating from the toe, the plating layer has at least one of a η-Zn phase, MgZn2 phase, Mg2Zn3 phase, or MgZn phase as a metal Zn-containing phase having a circle-equivalent diameter of 0.5 µm or more, and when each of the metal Zn-containing phases is projected onto an interface between a base iron and the plating layer, a total sum of lengths of the metal Zn-containing phases in the direction orthogonal to the extension direction, Lt, is 10% or more of a length of the interface, Le.