| 摘要 |
End portions of extruded frame members 50 and 60 have increased thickness portions 56 and 66 which project toward an outer side thereof. A rotary body 70 is inserted into the increased thickness portions 56 and 66 and is rotated so as to carry out friction stir welding of the frame members. A large diameter portion 71 of the rotary body 70 is inserted to a position between the apex of the increased thickness portion and an extension line of an outer face of the plates 51 and 61 of the extruded frame members 50 and 60 as the rotary body 70 is rotated. Further, the rotary body 70 is reciprocated in a direction orthogonal to the welding line as it is moved along the welding line. Accordingly, friction stir welding can be carried out fully. In the friction stir welding, due to a rotation of the rotary body 70, even when a gap g between two extruded frame members to be subjected to welding is large, it is possible to carry out the friction stir welding.
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