Method for manufacturing joined body, and joining device

A method for manufacturing a joined body using a rotary tool with a stirring pin to perform friction stirring on a composite body having a first surface and a second surface that is different from the first surface, wherein in the composite body, metal members are combined together in a joined arrangement, the method comprising:

• an arrangement step of forming the composite body by combining the metal members in the arrangement;
• a fixing step of fixing the composite body with a fixing tool in a state where the metal members are combined together;
• a first friction stirring step of performing friction stir welding by inserting the stirring pin through the first surface into the composite body that is fixed by the fixing tool;
• a rotating step of rotating the composite body and the fixing tool such that the second surface is in a positional relationship to face the rotary tool;
• and
• a second friction stirring step of performing friction stir welding by inserting the stirring pin through the second surface into the composite body that is fixed by the fixing tool;
• wherein the fixing step includes fixing the composite body by sandwiching the first surface and a site of the composite body opposite to the first surface with the fixing tool.

A method for manufacturing a joined body using a rotary tool with a stirring pin to perform friction stirring on a composite body having a first surface and a second surface that is different from the first surface, wherein in the composite body, metal members are combined together in a joined arrangement, the method comprising:

• an arrangement step of forming the composite body by combining the metal members in the arrangement;
• a fixing step of fixing the composite body in a state where the metal members are combined together;
• a first friction stirring step of performing friction stir welding by inserting the stirring pin through the first surface into the composite body that has been fixed;
• a rotating step of rotating the fixed composite body such that the second surface is in a positional relationship to face the rotary tool;
• and
• a second friction stirring step of performing friction stir welding by inserting the stirring pin through the second surface into the fixed composite body;
• wherein the fixing step includes fixing the composite body with a fixing tool by sandwiching the entire first surface except for a friction stirring site and the entire second surface except for a friction stirring site, the second surface being opposite to the first surface of the composite body.