| 摘要 |
The object of the present invention is to weld a hollow-shaped material from one side, regardless of the size accuracy of the hollow-shaped material or the like, and to form the joint with higher strength. Projecting segments 12b, 22b of face plates of hollow-shaped materials 10, 20 are friction stir welded from above. Next, a connecting material 30 is placed on the upper face plates 11, 21 of the hollow-shaped materials 10, 20, and is friction stir welded from above. The welding region exists at the node between a rib connecting the two face plates 11, 12 (21, 22) and the face plate 11 (21). The joint of the connecting material 30 and the face plates 11, 21 are lap joint. Not butt joint. Therefore, the hollow-shaped materials could be welded with ease, even though there exists manufacturing tolerance, or tolerance in arrangement of the hollow-shaped materials 10, 20.
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