In order to validate the reliability of the system, an ultrasonic immerse scanning method was used to inspect a spherical brazed specimen which has artificial defects. The frequency of the immerse focus probe is 10 MHz, its focused spot diameter is 0.5 mm and its focus is 30 mm. Under the computer control, five-axis (X, Y, Z, A, B) movement is realized, the C-scan imaging of braze weld joint being as shown in Fig. 4, the specimens’ ratio of brazing area being
30.48%. The result shows that the system scanning speed and accuracy satisfy testing requests well, and that the inspection results are reliable. Thus the following conclu- sions can be drawn: