Csck-iva test block is designed according to the ultrasonic inspection requirements of Type I welded joints of NB/T47013-2015 standard pressure equipment. It is suitable for the inclined probe and straight probe to detect type I welded joints with workpiece thickness ranging from 200mm to 500mm.
Test method: (1) Setting of shear wave sensitivity: Select the diagonal probe that has been verified and place it at the position a in the diagram, and move the probe back and forth so that the direct sound beam can get the maximum reflection echo on the φ6mm transverse through hole. Adjust the echo amplitude to 80% of the height of the full screen, record the dB value at this time, which is the first point. The probe is placed at position b in the diagram, and the probe is moved forward and backward to obtain the maximum reflection echo of the direct sound beam on the φ6mm transverse through-hole. Adjust the echo amplitude to 80% of the height of the full screen, record the dB value at this time, which is the second point. The probe is placed at position c in the diagram, and the probe is moved forward and backward to obtain the maximum reflection echo of the direct sound beam on the φ6mm transverse through-hole. Adjust the echo amplitude to 80% of the height of the full screen, record the dB value at this time, which is the third point. The probe is placed at position d in the diagram, and the probe is moved forward and backward so that the direct sound beam can get the maximum reflected echo on the φ6mm transverse through-hole. Adjust the echo amplitude to 80% of the height of the full screen, record the dB value at this time, which is the fourth point. By analogy, the test depth of the test block is determined according to the thickness of the detected workpiece, and the above points are connected into a curve, which is the reference line specified in the standard.
(2) P-wave sensitivity setting: Select the verified straight probe at position e in the diagram, move the probe back and forth so that the direct sound beam can get the maximum reflection echo on the φ6mm transverse through hole. Adjust the echo amplitude to 80% of the height of the full screen, record the dB value at this time, which is the first point. The probe is placed at position f in the diagram, and the probe is moved back and forth so that the direct sound beam can get the maximum reflected echo on the φ6mm transverse through-hole. Adjust the echo amplitude to 80% of the height of the full screen, record the dB value at this time, which is the second point. The probe is placed at position g in the diagram, and the probe is moved back and forth to the left and right so that the direct sound beam can get the maximum reflected echo on the φ6mm transverse hole. Adjust the echo amplitude to 80% of the height of the full screen, record the dB value at this time, which is the third point. The probe is placed at the h position in the diagram, and the probe is moved forward and back to the left and right so that the direct sound beam can get the maximum reflected echo on the φ6mm transverse through-hole. Adjust the echo amplitude to 80% of the height of the full screen, record the dB value at this time, which is the fourth point. By analogy, the depth of the test block is determined according to the thickness of the workpiece to be inspected. All the above points are connected into a curve that is the reference line specified in the standard, and the sensitivity at this time is the reference sensitivity.
