Laser weld defect detection device and laser weld defect detection method

摘要

Problem to be solved: to provide a laser welding defect detecting apparatus and a laser weld defect detection method capable of detecting a weld defect and capable of easily responding to a complicated welding shape.The processing head 3 irradiates the laser beam emitted from the laser light oscillation apparatus 1 to the welded portion.The thermal radiation optical sensor 4 detects the intensity of the thermal radiation light generated from the welded portion by irradiation of the laser light.The laser light transmission paths 2a, 2b and 5 have optical fibers 2A connected to the laser light oscillation apparatus 1, and transmit laser light from the laser beam oscillator 1 to the machining head 3.The thermal radiation optical transmission paths 2a, 2C and 5 transmit thermal radiation from the machining head 3 to the thermal radiation optical sensor 4 and share the optical fiber 2A between the laser beam transmission paths 2a, 2b and 5.Diagram