APPARATUS AND METHOD FOR DETERMINING QUALITY OF LASER WELDED PART, AND MEDIUM RECORDED WITH PROGRAM FOR DETERMINING QUALITY OF LASER WELDED PART

摘要

PROBLEM TO BE SOLVED: To make determination of quality of a laser welded part fully satisfactory in laser lap welding though the laser welded quality changes by the lap gap fluctuation of materials to be welded.

SOLUTION: This is an apparatus for determining quality of a laser welded part MP in lap welding in which a laser beam LB is emitted to materials M1, M2 to be welded. The apparatus is equipped with: a first photodetector 2 that detects a light beam generated from the laser welded part in accordance with the lap welding, on the same axis as the emitted laser beam; a second photodetector 5 that detects a light beam generated from the laser welded part in accordance with the lap welding, at a prescribed angle relative to the surface of the materials to be welded; and a quality determining means 4 for determining the quality of the laser welded part by receiving a first photodetecting signal from the first photodetector and a second photodetecting signal from the second photodetector.

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