Patent ID: 8052031

Claim:
A bonding structure for a container including a container member having an opening and a covering member for covering the opening of the container member, the bonding structure comprising: a bonding portion of the container member and the covering member formed by inserting a friction stir welding tool into an abutting portion of the container member and the covering member and performing a friction stir welding operation; and a backing member that is disposed within a spacing portion that is defined between and enclosed by the bonding portion, the container member and the covering member, wherein the backing member includes a first surface and an opposing second surface, the first surface is disposed adjacent to the bonding portion, at a side of the abutting portion that is opposite to an inserting side of the friction stir welding tool to obstruct a plastic flow of materials of the container member and the covering member when the friction stir welding operation is performed, and the opposing second surface is in contact with a flange portion of one of the container member and the covering member in the spacing portion.