| 摘要 |
A joining device (10) that butts together and joins metal pipes by means of friction stir welding from the interiors of the metal pipes, and that addresses the problems of preventing the generation of opening defects at the inner surface of the metal pipes and of preventing the generation of sputter when the pipes are butted together and joined, said joining device being equipped with: a friction stir unit (20), which has a joining tool (22) at the tip of which is formed a probe (21) that is pushed into the parts to be joined, a retaining jig (25) that holds the joining tool (22) so as to be capable of moving in the direction of the central axis (R) of the joining tool, and a first motor (30) that rotates the joining tool (22) around the central axis (R) via the holding jig (25); a pressing part (35), which presses the joining tool (22) in the direction of the central axis (R); and a circumferential direction movement unit (40), which has a tubular case (41) to one end of which the holding jig (25) and the pressing part (35) are attached, and a second motor (44) that moves the joining tool (22) in the circumferential direction along the inner circumferential surface of the metal pipes (11), via the case (41). |
