| 摘要 |
PROBLEM TO BE SOLVED: To easily form a light-weight and high rigidity structural body with friction agitation joining by connecting parallel face plates in a truss shape with plural ribs, protruding the end part of a lower face plate more than the end part of an upper face plate and positioning the end part of the upper face plate at a roughly center. SOLUTION: Hollow shape materials 10, 20 that two sheets of face plates 11, 12 and face plates 21, 22 are connected with respective plural ribs 13, 23 in a truss shape, are extruded. At this time, the end part of a lower plate is protruded, the end part of an upper plate is near an apex of a truss. These hollow shape materials 10, 20 are arranged side by side on a bed 240, protruding parts 16, 26 of facing end parts 12b, 22b of each face plate 12, 22 are subjected to friction agitation joining from above. Next, bulged parts 35, 35 of a joint material 30 are fitted into the recessed part arranged on the protruding parts 15, 25 of the end parts of the face plates 11, 21, friction agitation joining thereof is performed from above. The load in joining is supported by the ribs 13A, 13B, 23A, 23B, etc. By this method, the structural body of truss structure as a whole is formed.
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