| 摘要 |
PURPOSE: To automatically detect a welding state in real time by measuring the radiation light at a laser welded point, subjecting the measured light to a spectrum analysis and measuring the intensity of the respective intrinsic wavelengths of the main elements of welding materials among various kinds of the spectral intensity. CONSTITUTION: A laser beam 3 is reflected by a laser beam reflection mirror 10 and the welding materials 1 are irradiated with this laser beam. The radiation light from the welding point 2 is caught by a probe 5 and is inputted by an optical fiber 6 to a spectrum analysis apparatus 7. The radiation light of the optical fiber 6 is amplified and spectrally split by this analysis apparatus 7 and thereafter, the spectral intensity of the wavelength spectrally split by a detecting section 72 is measured and is inputted to a controller 73. This controller 73 inputs the measured value of the spectral intensity at the intrinsic frequency of the main constituting elements of the welding materials 1 in the processing for forming the spectral distribution to a structure state judging means 8. The measured value and the reference value stored in a memory 81 are compared by a CPU 80. If the measured value is larger than the reference value, judgment is made that the main constituting element is in a molten state. |
