| 摘要 |
A friction stir welding apparatus 1a comprises members 20 and 30 to be subjected to a friction stir welding which members are fixed on a table 5, and a joining welding head 200 which moves in an arrow mark A direction along the table 5. A rotary tool 10 performs the friction stir welding so that a welding bead 50 is formed. A sensor 210 irradiates a light beam 212 on the area to be welded and detects edge portions 24 and 34 of the members, and the welding head 200 is moved and controlled to follow the center of the welded joint. A burr removing cutting means 12 of the rotary tool 10 operates to cut off the burr from the weld, causing chips 60 to be formed. An air jet J injected from an air nozzle is discharged to the outside from a cover 230, whereby entry of the chips 60 into the area of the sensor 210 can be prevented. In a friction stir welding apparatus, the entry of chips into the area of the sensor 210 for detecting a center position where the welding joint is located can be prevented.
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