| 摘要 |
The present invention relates to an apparatus (1) for friction stir welding comprising a drive shaft (3), a probe (5) formed on the second end (15) of the drive shaft (3), extending along the longitudinal direction, having a circumferential first friction surface (19) extending along the longitudinal direction, and having a distal end (21) remote from the drive shaft (3), and a shoulder element (7) having a second annular friction surface (25) extending away from the longitudinal direction and facing towards the free end, wherein an annular cavity (53) is formed between the drive shaft (3) and/or the probe (5) on the one hand and an inner surface of the shoulder element (7) on the other hand. For achieving an improved cooling, the shoulder element (7) comprises first and second through holes (33, 35), the first and the second through holes (33, 35) being spaced apart in the longitudinal direction, and wherein an annular ring element (9) is provided which is rotatable with respect to the shoulder element (7), the annular ring element (9) being rotatably supported on the shoulder element (7) by first and second support members (45, 47) between which an annular channel (49) is formed, the annular channel (49) being arranged such that the first through hole (33) connects the annular channel (49) with the annular cavity (53), and the annular ring element (9) radially outwardly delimits the annular channel (49) and comprises a through bore (51) which extends to the annular channel (49). |
