| 摘要 |
In a welded structure, e.g. a side structure of a railway car body, a raised portion 32 is provided on an upper face of an end portion of a plate 31 of one frame member 30. An end portion of a plate 41 of another frame member 40 is abutted to the plate 31, so that there is a height difference at their welding surfaces. The frame members 30 and 40 are aluminium alloy extruded frame members. Their extrusion directions are orthogonal. Padding welding is carried on an upper face of the plate 41 to raise it at least partially. From the upper side a rotary tool is inserted to carry out friction stir welding. The padding welding portions serve the same function of the raised portion 32 and good quality welding can be carried out. <IMAGE> |
