| 摘要 |
PROBLEM TO BE SOLVED: To ensure the soundness of narrow pipe welded part by applying a laser beam having a specified power concentration and a specified pulse width to a welded part inside a narrow part welded to a reactor vessel. SOLUTION: A visible pulse laser beam 4 from an obtical fiber 2 is converged with a combination condensing lens 3 and incident to the inner surface of a narrow pipe 1. An outer cylinder 62 of rotatively driving motor 7 and the emission part of the fiber 2 are connected by a partially transparent cylindrical laser application window 6 and the power supply to the motor 7 is made by a storage battery 8 mounted at an end of the motor 7. A laser reparing or correcting device 13 for the inner surface of a narrow pipe is put at the deep position of the pipe 1 by a device for putting the device 13 in and out of the pipe 1, and the device 13 is moved while pulled to the direction of the pipe 1. An optical connection structure 61 is composed of a connection structure 66, the optical fiber 2, the lens 3, a fixation ring 68 and the like, and the window 6 is connected to the outer cylinder 65 while the cylinder 65 to the structure 66. |
