| 摘要 |
PROBLEM TO BE SOLVED: To provide a monitoring device in which a molten state is directly observed from above the optical axis of a laser beam so that normal/defective condition of a weld bead is discriminated in real time. SOLUTION: This device is provided with a flash lamp 13 which emits a light beam brighter than the beam generating from a weld zone at the time of laser irradiation, near the molten pool synchronously with the pulse of the laser beam, and a CCD camera 14 which is equipped with an interference filter suitable to the wave length of the flash lamp 13 and which opens/closes a shutter synchronously with the pulse of the laser beam; consequently, monitoring is performed for the molten state in real time by receiving from the CCD camera an image of the molten pool and its proximity during the laser welding. |
