DEVICE AND METHOD OF MONITORING LASER WELDING CONDITION

摘要

PROBLEM TO BE SOLVED: To provide the monitoring device capable of improving accuracy in detecting defects. SOLUTION: In the housing of a laser torch 12, a condensing lens 15 is provided that converge welding light produced from a welding part so as to have the same optical axis as that of a laser beam emitted to a workpiece 14. Among the beams of the welding light, plasma light beams are converted to electrical signals through plural optical fibers 2 and plural photodiodes 3. Among the beams of the welding light, the reflected light of the emitted laser beam are converted to electrical signals through plural optical fibers 4 and plural photodiodes 5. A device 6 for discriminating and processing welding conditions detects defects of welded parts based on the levels of the plural electrical signals from the photodiodes 3, 5.