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US 8,281,977 B2Granted
Joining method and friction stir welding method
AssigneeNippon Light Metal Company, Ltd.
InventorsHayato Sato, Hisashi Hori
Life of this patent
Estimating the term…
Abstract
A method of welding includes a first primary welding step of carrying out a friction stir welding on the abutting portion of metal members from a first surface of a metal member. In a second primary welding step, the abutting portion is friction stir welded from the reverse face side of the member, while penetrating a stirring pin of rotation tool in a plasticized region formed in the first primary welding step.
Claims16
A joining method comprising:
- a butting step in which metal members to be joined are butted against each other forming a butting portion, a first surface of the metal members are made flush with each other, and a back surface, opposite said first surface, of the metal members are made flush with each other;
- a preliminary joining step in which the butting portion between the metal members is preliminarily friction stir welded from the first surface of the metal members;
- a first primary welding step in which the butting portion between the metal members is friction stir welded from the first surface of the metal members by plasticizing and fluidizing again a plasticized region formed by the preliminary joining step;
- and
- a second primary welding step in which the butting portion is friction stir welded from the back surface of the metal members;
- wherein,
- before the first primary welding step, the metal members are fixedly locked on a platform of a friction stir welding machine, using a jig, whereby the first primary welding step is performed with the metal members held immovably on said platform;
- after the first primary welding step, burrs formed during friction stir welding are removed, and the metal members are then turned over so that the back surfaces thereof turn up;
- and
- the sum of the length of a stirring pin of a rotating tool used in the first primary welding process and the length of a stirring pin of a rotating tool used in the second primary welding process is at least equal to the thickness of the metal members at the butting portion.
7 more elements
A joining method comprising:
- a butting step in which metal members to be joined are butted against east other forming a butting portion, a first surface of the metal members are made flush with each other, and a back surface, opposite said first surface, of the metal members are made flush with each other;
- a first primary welding step in which the butting portion between the metal members is friction stir welded from a first surface of the metal members;
- a preliminary joining step in which the butting portion between the metal members is preliminarily friction stir welded from the back surface of the metal members;
- and
- a second primary welding step in which the butting portion is friction stir welded from the back surface of the metal members by plasticizing and fluidizing again a plasticized region formed by the preliminary joining step;
- wherein,
- before the second primary welding step, the metal members are fixedly locked on a platform of a friction stir welding machine, using a jig, whereby the second primary welding step is performed with the metal members held immovably on said platform;
- after the second primary welding step, burrs formed during friction stir welding are removed, and the metal members are then turned over so that the first surfaces thereof turn up;
- and
- the sum of the length of a stirring pin of a rotating tool used in the first primary welding step and the length of a stirring pin of a rotating tool used in the second primary welding step is at least equal to the thickness of the metal members at the butting portion.
7 more elements
Dependencies are inferred from the claim text.