| 摘要 |
PURPOSE:To accurately discriminate whether a fault at a joining boundary exists on the upper surface side or lower surface side of an inserted material at real time by discriminating the jointed state of the joined boundary from peak values of both (+) and (-) polarity parts of reflected echo waves. CONSTITUTION:When reflected echo waves of ultrasonic waves 7 are used, reflected waves from the boundary between a cemented carbide 4 and upper surface of an inserted material 6 and those from the boundary between the lower surface of the material 6 and steel 5 are superimposed upon another, since joined surfaces where no fault occurs exist between material 6 and cemented carbide 4 and steel 5. When ultrasonic waves 8 are used, the reflected waves basically become the same as the reflected waves obtained when only the cemented carbide 4 exists. In the case of ultrasonic waves 10, the reflected waves are composed of those from the boundary at the upper surface of the material 6 and those from a fault 1, since the fault 11 exists between the material 6 and steel 5. Therefore, when peak values of both (+) and (-) polarity parts are detected from the waveform pattern of reflected waves, whether a fault exists on the upper surface or lower surface of the inserted material can be discriminated at real time. |
