Hitachi, Ltd.

Yasuo Ishimaru

Kinya Aota

Tsuyoshi Takenaka

Masakuni Ezumi

Hisanori Okamura

Isao Funyuu

Akihiro Satou

Takeshi Kawasaki

Morishige Hattori

Masahiko Sakamoto

Keiji Ohmura

Akihiro Sato

Hideshi Ohba

Hiroshi Kobayashi

Isao Funyu

Takashi Tao

Kouichi Watanabe

Junji Tamura

Akihiro Satuo

This invention provides a configuration of a joint that allows a satisfactory welded joint to be formed with reduced deformation of the joint region when two-face structures (panels) are friction-welded end to end. The panelseach have two substantially parallel platesand a third memberconnecting the two plates. The end portions of the platesof one panelare friction-welded to the end portions of the platesof the other panel. At least one of the panels has a plateat its end for connecting the platesandand has a rigidity to support a pressing force produced during the friction welding.

Method of joining two members by friction stir welding

This invention provides a configuration of a joint that allows a satisfactory welded joint to be formed with reduced deformation of the joint region when two-face structures (panels) are friction-welded end to end. The panelseach have two substantially parallel platesand a third memberconnecting the two platesThe end portions of the platesof one panelare friction-welded to the end portions of the platesof the other panelAt least one of the panels has a plateat its end for connecting the platesandand has a rigidity to support a pressing force produced during the friction welding.

Friction stir welding method and structure body formed

Friction stir welding member

Friction stir welding method and structure body

Friction stir welding hollow frame member

Disclosed is a friction stir welding technique which avoids occurrence of a dent, in a joining region, extending to a level beneath the joined surfaces. At end portions of the frame members to be joined, at the joining region, thickened parts which project toward the rotary body joining tool are provided. Two adjoining thickened parts, of adjacent members to be joined, can form a trapezoid shape. The rotary body joining tool has a small-diameter tip portion and a larger diameter portion. The rotary body joining tool is inserted in the thickened parts. In a state where the rotary body joining tool has been inserted small-diameter tip end first, to a level where the larger diameter portion of the rotary body joining tool overlaps the thickened part but does not extend below the upper surface of the non-thickened surfaces of the members joined, the rotary body is rotated and moved along the joining region. Even when a gap exists between two thickened parts, a desirable joining can be carried out. After the joining, the remaining parts of the thickened parts can be machined so as to form a smooth surface.

Friction stir welding method, frame members used therein, and product formed thereby

Manufacturing method of structure body and structure body formed

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Kudamatsu, Japan

Yasuo Ishimaru