ALUMINUM AND ALUMINUM ALLOY SPIRAL TUBE, AND ITS MANUFACTURING METHOD, FRICTION STIR WELDING METHOD, AND STRUCTURE OF FRICTION STIR-WELDED ALUMINUM AND ALUMINUM ALLOY

摘要

PROBLEM TO BE SOLVED: To provide an aluminum and aluminum alloy spiral tube of high quality and highly efficient manufacture and to establish its manufacturing method, to prevent occurrence of an unjoined part on the rear face of a material to be joined in a friction stir welding method, and to make such rear face a decorative face to be externally viewed.;SOLUTION: The spiral tube is manufactured by continuous manufacturing process including: a forming means by which a belt-like material is formed into a circular spiral shape; and a friction stir welding means in which a rotary tool (7) comprising a pin (5) and a shoulder (6) with a recess (8) around the pin is arranged in the inner circumferential face in the butting part of the formed body (4), in which, while rotating the tool, the pin is inserted till the shoulder part bites the butting part with the sweepback angle (θ), and in which a back bead is formed, while producing a burr, by a rotary roller (10) having also a role of a backing material, on the outer circumferential face of the abutting part of the formed body.;COPYRIGHT: (C)2006,JPO&NCIPI