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    • 54. 发明公开
    • WELDING METHOD AND WELD STRUCTURE
    • SCHWEISSVERFAHREN UND SCHWEISSSTRUKTUR
    • EP3147065A1
    • 2017-03-29
    • EP15186577.1
    • 2015-09-23
    • Neturen Co., Ltd.
    • Terajima, AkiraKawasaki, KazuhiroIkuta, FumiakiKoyata, YasuyukiMisaka, Yoshitaka
    • B23K11/11
    • B23K11/115B23K11/24B23K2103/04B23K2103/166
    • Object of the present invention is to provide a welding method prevented the fracture at the spot weld zone by recovering the strength of a spot weld zone, namely, the ductility and the toughness in the spot weld zone, and a weld structure manufactured by the method. In the welding method, the steel sheets are heat treated and spot welded and a spot weld zone composed of a weld nugget and a heat affected zone is formed at the outer periphery of the weld nugget, spot welded steel sheets are tempering treated by applying a high-frequency electrical current on the spot weld zone and a heat accumulation zone elevated a temperature is formed at the outer periphery of the weld nugget and a hardness at the weld nugget is made 150% or less of the hardness of the heat treated steel sheets and a hardness at the heat affected zone is made 30% to 90% of the hardness at the weld nugget before the tempering treatment; and the diameter of the weld nugget NR (mm) satisfies the conditional expression (1). 3 t ≦ NR where, t is the average thickness of the heat treated steel sheets
    • 本发明的目的是提供一种通过回收点焊区域的强度即点焊区域的延展性和韧性以及通过该方法制造的焊接结构来防止点焊区域的断裂的焊接方法 。 在焊接方法中,对钢板进行热处理和点焊,并且在焊点的外周形成由焊点和热影响区构成的点焊区域,点焊钢板通过应用 点焊区域和蓄热区域的高频电流在焊点的外周形成温度,焊接熔核的硬度为热处理钢板的硬度的150%以下 热回收区的硬度为回火处理前的焊点的硬度的30〜90%。 并且焊接块NR(mm)的直径满足条件式(1)。 3 t‰| NR其中,t是热处理钢板的平均厚度