To provide a joining method capable of enhancing the watertightness and airtightness between side surfaces of joined metal members by butting a side surface of a first metal member to an end face of a second metal member, and enhancing the joining strength.
The joining method includes a butting step of forming a joined metal member 1 in which a first metal member 1a having a projecting part on its side surface and a second metal member 1b having a recess part on its end face, a first permanent joining step of performing the friction stir welding from a surface A to a butted part J1, a second permanent joining step of performing the friction stir welding from a back side B to the butted part J1, and a side surface permanent joining step of performing at least either one of the welding and the friction stir welding from the side surface to the butted part J1. A surface side plasticized area W1 overlaps a weld metal T1 or a first side surface side plasticized area W3; and a back surface side plasticized area W2 overlaps the weld metal T1 or the first side surface side plasticized area W3.
HORI HISASHI
KAWAMOTO TOMOHIRO
AOKI KAZUO
Etsuo Tada
Nosho Machida
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