PROBLEM TO BE SOLVED: To provide a bonded joint which has an excellent joint strength and an improved reliability.SOLUTION: In this bonded joint, a point-like junction has a melt solidified part 30 bridging over plural metal plates 20a, 20b, the melt solidified part has a re-melt solidified part 30a and a solidification re-heating part 30b, the re-melt solidified part has a point-like form which includes a circle equivalent central axis of the melt solidified part and bridges over the plural metal plates in a plan view of the melt solidified part, and the re-melt solidified part has a cylindrical shape and is positioned inside a melting boundary between the melt solidified part and a steel plate so as not to be overlapped on the melting boundary. The solidification re-heating part is positioned around the re-melt solidified part, and includes the melting boundary. Further, in the solidification re-heating part, a segregation of P is alleviated in a rectangular planar area of 100 μm×100 μm with a point on an extension line of a steel plate mating surface, which is separated from an intersection point between the mating surface and the melting boundary by 100 μm, as a center point.SELECTED DRAWING: Figure 3

    【課題】継手強度に優れ、信頼性の向上した接合継手を提供する。【解決手段】点状の接合部は、複数の金属板20a,20bに跨る溶融凝固部30を有し、前記溶融凝固部は、再溶融凝固部30aと、凝固再加熱部30bとを有し、前記再溶融凝固部は、前記溶融凝固部を平面視したとき、当該溶融凝固部の円相当中心軸を含む点状で、前記複数の金属板に跨っており、前記再溶融凝固部は、シリンダー状の形状を有し、前記溶融凝固部と鋼板との溶融境界の内側に該溶融境界とは重ならないように位置しており、前記凝固再加熱部は、前記再溶融凝固部の周囲に位置し、前記溶融境界を含んでおり、更に、前記凝固再加熱部において、前記鋼板合わせ面と前記溶融境界の交点から合わせ面の延長線上に100μm隔てた点を中心点とした、100μm×100μmの矩形平面領域にて、Pの偏析が緩和されていることを特徴とする重ね接合継手。【選択図】図3


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    Title :

    LAP BONDED JOINT AND MANUFACTURING METHOD THEREFOR


    Additional title:

    重ね接合継手及びその製造方法


    Contributors:

    Publication date :

    2017-12-21


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Japanese


    Classification :

    IPC:    B23K Löten , SOLDERING OR UNSOLDERING / B62D MOTOR VEHICLES , Motorfahrzeuge



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