| 摘要 |
PROBLEM TO BE SOLVED: To enable a nugget diameter to be measured with high accuracy utilizing reflected wave of supersonic transverse wave, even in a spot welding using an electrode tip of which the axial center is inclined with respect to an abutting surface abutting on a workpiece. ! SOLUTION: An inspection device 10 includes a vibrator 16 capable transmitting and receiving supersonic wave and a propagation medium 18 which comes into contact with each of a bottom surface 6 of a fitting hole 4 substantially vertical to axial center o in an electrode tip 12 and the vibrator 16 and propagates supersonic wave between the propagation medium, and bottom surface and the vibrator. The vibrator 16 emits supersonic wave in such a way that an incident angle θ3 for a boundary surface 19 between the bottom surface 6 and the propagation medium 18 becomes an oblique angle. The propagation medium 18 is made of material different from that of the electrode tip 12, sonic speed of supersonic wave to be propagated is adjus |
