METHOD AND DEVICE FOR INSPECTING LASER WELDING QUALITY

摘要

PROBLEM TO BE SOLVED: To provide a method and a device for inspecting the laser welding quality for correctly and rapidly inspecting the laser welding quality.

SOLUTION: In the laser lap welding, the laser beams from a keyhole part of a work 2 are received by a high-speed camera 4 during the welding through a filter 3 with the frequency component range of plasma beams as the transmission band, and the plasma beam image of the keyhole part is taken in. The angle of inclination and the area of the plasma beam image to express acceptance/rejection of the welding display with high accuracy are obtained by an image processor 6. The obtained angle of inclination and area are compared with reference values by a determination circuit 7, and the result thereof is defined as the result of inspection of the welding quality. The values obtaining "acceptance" by experiments or the like in advance are selected as the reference values.

COPYRIGHT: (C)2004,JPO