| abstract |
PROBLEM TO BE SOLVED: To provide a laser welding apparatus capable of monitoring plasma with high accuracy without requiring restriction on a posture of a processing tool and positioning to a plasma light emitting part. When a laser beam is irradiated from the laser welding torch 3 to the surface of a work 5 to be welded, plasma 6 is generated. This is introduced into the optical fiber 4, extracted by a half mirror 50 with a filter, branched by half mirrors 31, 32, and reflection mirror 33, dispersed by bandpass filters 21-23, and detected by optical sensors 11-13. Using the detection result, control is performed to keep the plasma light intensity and temperature constant. It is also possible to estimate the luminescent material, set the welding conditions accordingly, set the laser beam focus, and the like. [Selection] Figure 2 |