Patent ID: 7500640

Claim:
A hollow assembly structure comprising: a structural frame member including at least one first plate and at least one second plate, the first plate and the second plate being arranged so that plate faces thereof intersect each other for keeping positions of the first plate and the second plate by each other; an outer plate that covers the structural frame member, wherein a side end face of the first plate or the second plate of the structural frame member is overlaid with the outer plate such that any abutting edges of said outer plate do not overlie said first and second plates; and at least one of a friction stir weld and friction pressure weld joining, without a stud, the outer plate to the first plate or the second plate, the weld comprising cooled and solidified material undergoing plastic flow extending from an obverse side of the outer plate to a part of the first plate or the second plate at an overlapped portion; wherein, the hollow assembly structure composes at least a part of a wing, and the first plate is a spar, the second plate is a rib, and the outer plate is a blade face, the structural frame member being formed by shaving out a block member, and the first plate and the second plate being formed integrally.