WELDING QUALITY INSPECTION APPARATUS, AND WELDING QUALITY INSPECTION METHOD

摘要

PROBLEM TO BE SOLVED: To provide a technique which can detect the contour of a weld ball without a problem even if a surface of the weld ball is smooth.SOLUTION: A welding quality inspection apparatus 20 comprises: a camera 21 which images a weld ball 14a in a direction substantially parallel to a center axis direction C of a stator core 6 to generate image data; two inner peripheral side lighting devices 22 and two outer peripheral side lighting devices 23 which emit blue light toward the weld ball 14a and are arranged so that the blue light is reflected by the weld ball 14a and reaches the camera 21; and a contour detection part 30 which refers to the image data and detects a contour E of the weld ball 14a viewed from the camera 21 on the basis of a light emission region of the weld ball 14a due to reflection. A distance D2 between each lighting device in the center axis direction C of the stator core 6 and the stator core 6 is substantially equal or small in comparison with a distance D1 between the weld ball 14a in the center axis direction C of the stator core 6 and the stator core 6.