| 摘要 |
PROBLEM TO BE SOLVED: To provide a method of closely joining the thick materials to be joined, and to provide a joined structure. SOLUTION: In the joined structure of the thick materials to be joined, a pair of thick materials 1, 1 to be joined in which a step part comprising an outside edge face, an intermediate face and an inside edge face is each formed along the respective joining edges and the outside edge faces are mutually butted, and a connection board 5 inserted into a recessed part formed between the intermediate faces and the inside edge faces of both the thick materials 1, 1 to be joined and having a cross-sectional shape same as or similar to that of the recessed part are provided. A butted part obtained by mutually butting the outside faces of both the thick materials 1, 1 to be joined and butted parts between the connection board 5 and the inside edge face of each material 1, 1 to be joined are respectively subjected to friction stir joining to form joining lines W1 and W2. Further, the boundary face 7 between the connection board 5 and the bottom face of the recessed part is subjected to friction stirring. COPYRIGHT: (C)2005,JPO&NCIPI
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