To manufacture a frame structure having a heat exchange function while securing air-tightness and water-tightness.
A method of manufacturing the frame structure includes: a groove forming step of forming a recessed groove 30 for housing a heat transfer medium tube 31 at least in one of the joined surface 18 of a first frame member 10a and the joined surface 18 of a second frame member 10b; a hole forming step of forming a hole 32 for inserting the heat transfer medium tube 31 at least in one of the first frame member 10a and the second frame member 10b; a facing step of facing joined surfaces 18 into flat surfaces; a degreasing step of degreasing and removing grease on the surface of the joined surfaces 18; a heat transfer medium tube-installing step of installing a heat transfer medium tube 31 in the recessed groove 30; a superposing step of superposing the respective frame members 10a, 10b in the thickness direction; and a regular joining step of performing the friction stir welding by moving a rotary tool A for joining along the butted part 12 of the frame members 10a, 10b from outer circumferential surfaces 11 side of the frame members.
HORI HISASHI
SEO NOBUSHIRO
KAWAMOTO TOMOHIRO
Etsuo Tada
Nosho Machida
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