To provide the welded frame, its joining member and its joining method capable of mutually joining intermediate walls in the case of mutually welding square shapes with the intermediate wall and remarkably improving the strength of the joined part.
A pair of frames 1, 2 to be weld joined is composed of aluminum or aluminum alloy, formed in the square shape with an intermediate wall 12 in cross section, whose end part is provided with an intermediate end surface inclined to the longitudinal direction in the surface orthogonal to the intermediate wall 12, a pair of side end surfaces further inclined backward to this intermediate end surface, and the hole provided in the side wall in order to locally expose the intermediate wall 12. And the intermediate end surface of a pair of frames to be weld joined are mutually butted, the main body part in a triangle tubular shape of a first joining member 4 is fitted into a triangular zone between opposing side end surfaces, a pair of engaging parts of the first joining member 4 is engaged with the intermediate wall 12, thereafter the main body part and frames 1, 2 are weld joined and the intermediate wall 12 and the engaging part are welded via the hole.
YONEZAWA KAZUO
HASHIMURA TORU
FUJII TAKAHITO
KUROKAWA TADAYUKI
NAKAMURA FUJIO
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