Phased array ultrasonic detection TCG calibration test block

Abstract

The utility model relates to the field of ultrasonic detection, in particular to a phased array ultrasonic detection TCG calibration test block which comprises a test block body, a plurality of reflection holes with different depths are formed in the test block body, and the distance between any two reflection holes is not smaller than the acoustic beam width during fan-shaped ultrasonic scanning; a calibration curved surface is arranged on the test block body, and the curvature of the calibration curved surface is equal to that of a detection surface on a to-be-detected workpiece; a welding groove is formed in the test block body, a welding track is welded in the welding groove, and a plurality of reflection holes with different depths are formed in the welding track. The method has the advantage that the TCG calibration accuracy is improved.

Description

Technical Field

[0001] This application relates to the field of ultrasonic testing, and particularly to a phased array ultrasonic testing TCG calibration block. Background Art

[0002] Phased array ultrasonic testing is an advanced non-destructive testing technology that utilizes the characteristics of ultrasonic waves propagating in materials to detect internal defects or structural abnormalities in the materials. However, ultrasonic waves have obvious physical characteristics, that is, due to factors such as sound beam divergence and propagation attenuation at different sound path (time) positions, the sound pressure (echo signal height) at different sound paths (times) is inconsistent, which will affect the defect quantification.

[0003] Therefore, in order to reduce or eliminate the influence of propagation time, time gain calibration (TCG) should be performed in advance before the formal ultrasonic testing. Time gain calibration is achieved by emitting ultrasonic waves to emitters at different depths on the calibration block.

[0004] However, the positions of emitters at different depths on common calibration blocks are relatively compactly arranged, resulting in frequent interference signals between reflectors, leading to a large error in the calibration result, which has obvious deficiencies. Utility Model Content

[0005] In order to improve the calibration result, this application provides a phased array ultrasonic testing TCG calibration block.

[0006] The phased array ultrasonic testing TCG calibration block provided by this application adopts the following technical solution:

[0007] A phased array ultrasonic testing TCG calibration block includes a calibration block body, and a plurality of reflection holes with different depths are formed on the calibration block body, and the distance between any two reflection holes is not less than the sound beam width during fan-shaped ultrasonic scanning.

[0008] By adopting the above technical solution, an ultrasonic probe emits sound waves to the reflection holes, the sound waves bounce back after hitting the reflection holes and are received by the probe, and the received echo signals are used to calibrate the difference in time transmission of the sound waves. Sound waves are emitted to reflection holes at different depths, so that the echo signals at different transmission times are calibrated to the same reference. Since the distance between reflection holes at different depths on the calibration block body is not less than the sound beam width during fan-shaped scanning, the possibility of interference signals generated between different reflection holes is reduced.

[0009] Optionally, a plurality of reflection holes are located on the same or different calibration block bodies.

[0010] By adopting the above technical solution, the reflection holes can be arranged on the same or different calibration block bodies, and only need to ensure that there is enough spacing between different reflection holes.

[0011] Optionally, a calibration surface is arranged on the test block body, and the curvature of the calibration surface is equivalent to the curvature of the detection surface on the workpiece to be measured.

[0012] By adopting the above technical solution, the calibration surface enables the test block body to simulate the ultrasonic detection of the curved surface on the real workpiece, improving the objectivity and reliability of defect assessment.

[0013] Optionally, a welding groove is formed on the test block body, welding traces are welded in the welding groove, and a plurality of reflection holes with different depths are formed on the welding traces.

[0014] By adopting the above technical solution, when detecting that the welded joint is a coarse-grained material and the acoustic properties of the material are anisotropic, welding traces are made on the test block body according to the corresponding welding process requirements for detection, and then reflection holes are machined on the welding traces, thereby reducing the influence of the material on the TCG.

[0015] Optionally, it further includes a support block for supporting the test block body. The bottom surface of the support block is horizontal, and a support top surface for closely attaching to the calibration surface of the test block body is arranged on the top surface of the support block. The curvature of the support top surface is equal to the curvature of the calibration surface.

[0016] By adopting the above technical solution, during the time gain calibration process, when the calibration surface is used as the bottom surface, the test block body is placed on the support block, and the support block provides stable support for the test block body, thereby ensuring the stability of the test block body on the detection workbench.

[0017] Optionally, elastic clips are respectively arranged on two opposite sides of the support block, and the test block body is clamped between the two elastic clips.

[0018] By adopting the above technical solution, the two elastic clips cooperate to clamp the test block body, further improving the stability of the test block body during the calibration process.

[0019] Optionally, a bottom block is further arranged below the support block. A lifting blind hole is opened upward on the bottom surface of the bottom block. A support rod is arranged at the bottom of the support block and passes through and is slidably matched with the lifting blind hole. The cross section of the support block is an isosceles trapezoid, and both elastic clips are hinged on the support block. One elastic clip corresponds to one inclined surface of the support block, and the bottom end of the elastic clip is used to abut against the corresponding inclined surface of the support block.

[0020] By adopting the above technical solution, when the worker places the bottom block on the detection table, the bottom block and the supporting block approach each other. The two inclined surfaces of the supporting block simultaneously apply a resisting force to the corresponding elastic clamping pieces. The elastic clamping pieces are forced to rotate and press against the test block body, and the two elastic clamping pieces cooperate to clamp the test block body. That is to say, as long as the bottom block is placed on the detection table, the two elastic clamping pieces will automatically clamp the test block body on the supporting block, which is convenient for operation. Manually pick up the bottom block from the detection table, and the two elastic clamping pieces will automatically release the clamping of the test block body.

[0021] Optionally, the supporting rod is coated with polytetrafluoroethylene.

[0022] By adopting the above technical solution, the supporting block can move up and down on the supporting rod more smoothly.

[0023] In summary, the present application includes at least one of the following beneficial technical effects:

[0024] 1. The ultrasonic probe emits sound waves to the reflection hole. The sound waves bounce back after hitting the reflection hole and are received by the probe. The received echo signal is used to calibrate the difference in the time transmission of the sound waves. Sound waves are emitted to reflection holes at different depths, so that the echo signals at different transmission times are calibrated to the same reference. Since the distances between the reflection holes at different depths on the test block body are not less than the beam width during sector scanning, the possibility of interference signals generated between different reflection holes is reduced;

[0025] 2. When the detected welded joint is a coarse-grained material and the acoustic properties of the material are anisotropic, weld beads are made on the test block body according to the welding process requirements corresponding to the detection, and then reflection holes are machined on the weld beads to reduce the influence of the material on the TCG;

[0026] 3. Place the bottom block on the detection table, and the two elastic clamping pieces will automatically clamp the test block body on the supporting block, which is convenient for operation. Manually pick up the bottom block from the detection table, and the two elastic clamping pieces will automatically release the clamping of the test block body. Description of the Drawings

[0027] Figure 1 is a schematic structural diagram of Embodiment 1 of the present application.

[0028] Figure 2 is a cross-sectional view of the positional relationship among the test block body, the supporting block and the abutting block in Embodiment 2 of the present application.

[0029] Description of the reference numerals: 1. Test block body; 2. Reflection hole; 3. Calibration surface; 4. Weld groove; 5. Weld bead; 6. Supporting block; 7. Supporting top surface; 8. Elastic clamping piece; 9. Bottom block; 10. Lifting blind hole; 11. Supporting rod. Detailed Embodiments

[0030] The following is combined with the attachedFigure 1-2 A further detailed description of the present application will be given.

[0031] An embodiment of the present application discloses a phased array ultrasonic testing TCG calibration test block.

[0032] Embodiment 1

[0033] Referring to Figure 1 , the phased array ultrasonic testing TCG calibration test block includes a test block body 1, and a number of reflection holes 2 with different depths are provided on the test block body 1. During actual calibration, the depths of the reflection holes 2 are usually selected as 10 mm, 20 mm, and 30 mm.

[0034] Referring to Figure 1 , the distance between any two reflection holes 2 is greater than the beam width during fan-shaped ultrasonic scanning, thereby reducing the possibility of interference signals generated between different reflection holes 2.

[0035] Referring to Figure 1 , the reflection holes 2 with different depths can be provided on the same test block body 1 or on different test block bodies 1. When provided on different test block bodies 1, the possibility of interference signals generated between different reflection holes 2 can be further reduced.

[0036] Referring to Figure 1 , a calibration curved surface 3 is arranged on the test block body 1, and the curvature of the calibration curved surface 3 is the same as that of the detection surface on the workpiece to be measured. In order to reduce the difference, the radius of the calibration curved surface 3 is generally less than 250 mm.

[0037] Through the calibration curved surface 3, the real working condition of the ultrasonic probe facing the curved surface detection on the workpiece can be simulated, improving the objectivity and reliability of defect assessment.

[0038] Referring to Figure 1 , a plurality of welding grooves 4 with different depths are provided on the test block body 1. The cross-section of the welding groove 4 is U-shaped, and a welding trace 5 is welded in the welding groove 4. A plurality of reflection holes 2 with different depths are provided on each welding trace 5.

[0039] When the material to be detected is a coarse-grained material and the acoustic properties of the material are anisotropic, the welding trace 5 is made on the test block body 1 according to the welding process requirements corresponding to the detection, and then the reflection hole 2 is machined on the welding trace 5, thereby reducing the influence of the material on the TCG.

[0040] The implementation principle of Embodiment 1 is as follows: Select multiple reflection holes 2 with different depths on the test block body 1. Starting from the reflection hole 2 with the smallest depth, move the ultrasonic probe to find the echo signals of each sound beam and calibrate according to the operation of the detection instrument. Using the same method, calibrate the reflection holes 2 with other depths. After completion, the required TCG curve can be obtained. Since the distance between different reflection holes 2 is not less than the sound beam width during fan-shaped ultrasonic scanning, it is not easy to generate interfering signals between different reflection holes 2.

[0041] Embodiment 2

[0042] Refer to Figure 2 , the difference between this embodiment and Embodiment 1 is that: it further includes a support block 6 for supporting the test block body 1. The bottom surface of the support block 6 is horizontal, and a support top surface 7 for closely attaching to the calibration surface 3 of the test block body 1 is arranged on the top surface of the support block 6. The curvature of the support top surface 7 is equal to the curvature of the calibration surface 3.

[0043] Refer to Figure 2 , elastic clips 8 are respectively hinged on the opposite sides of the support block 6, and the test block body 1 is clamped between the two elastic clips 8. A bottom block 9 is further arranged below the support block 6. A lifting blind hole 10 is opened upward on the bottom surface of the bottom block 9. A support rod 11 that is threadedly connected to the bottom of the support block 6 and passes through and is slidably matched with the lifting blind hole 10 is provided on the support rod 11 with polytetrafluoroethylene coated. The cross-section of the support block 6 is an isosceles trapezoid. One elastic clip 8 corresponds to one inclined surface of the support block 6, and the bottom end of the elastic clip 8 is used to abut against the corresponding inclined surface of the support block 6.

[0044] The worker first places the test block body 1 on the support block 6, and the calibration surface 3 is closely attached to the support top surface 7. Then, during the process of placing the bottom block 9 on the detection table, the bottom block 9 and the support block 6 approach each other, and the two inclined surfaces of the support block 6 simultaneously apply a resisting force to the corresponding elastic clips 8.

[0045] The elastic clips 8 are forced to rotate and clamp the test block body 1 tightly. The two elastic clips 8 cooperate to clamp the test block body 1. That is to say, as long as the bottom block 9 is placed on the detection table, the two elastic clips 8 will automatically clamp the test block body 1 on the support block 6, which is convenient to operate. Manually pick up the bottom block 9 from the detection table, and the two elastic clips 8 automatically release the clamping of the test block body 1.

[0046] The above are all the preferred embodiments of this application. The protection scope of this application is not limited accordingly. Therefore, all equivalent changes made according to the structure, shape, and principle of this application should be covered within the protection scope of this application.

Claims

1. A phased array ultrasonic testing TCG calibration test block, comprising a test block body (1), characterized in that: The test block body (1) is provided with a plurality of reflection holes (2) of different depths, and the distance between any two reflection holes (2) is not less than the width of the sound beam during sector-shaped ultrasonic scanning.

2. The phased array ultrasonic testing TCG calibration test block according to claim 1, characterized in that: The plurality of reflection holes (2) are located on the same or different test block bodies (1).

3. The phased array ultrasonic testing TCG calibration test block according to claim 1, characterized in that: A calibration curved surface (3) is arranged on the test block body (1), and the curvature of the calibration curved surface (3) is equal to the curvature of the detection surface on the workpiece to be tested.

4. The phased array ultrasonic testing TCG calibration test block according to claim 1, characterized in that: The test block body (1) is provided with a welding groove (4), a welding trace (5) is welded in the welding groove (4), and a plurality of reflection holes (2) with different depths are provided on the welding trace (5).

5. The phased array ultrasonic testing TCG calibration test block according to claim 1, characterized in that: It also includes a support block (6) for supporting the test block body (1), the bottom surface of the support block (6) is horizontal, and the top surface of the support block (6) is provided with a support top surface (7) for being in close contact with the calibration curved surface (3) of the test block body (1), and the curvature of the support top surface (7) is equal to the curvature of the calibration curved surface (3).

6. The phased array ultrasonic testing TCG calibration test block according to claim 5, characterized in that: Elastic clips (8) are arranged on two opposite sides of the support block (6), and the test block body (1) is clamped between the two elastic clips (8).

7. The phased array ultrasonic testing TCG calibration test block according to claim 6, characterized in that: A bottom block (9) is arranged below the support block (6), and a lifting blind hole (10) is opened upward on the bottom surface of the bottom block (9). A support rod (11) is arranged at the bottom of the support block (6) and is inserted into the lifting blind hole (10) and slidably matched with the lifting blind hole (10). The cross section of the support block (6) is an isosceles trapezoid. Two elastic clips (8) are hinged on the support block (6), and one elastic clip (8) corresponds to an inclined surface of the support block (6). The bottom end of the elastic clip (8) is used to abut against the corresponding inclined surface of the support block (6).

8. The phased array ultrasonic testing TCG calibration test block according to claim 7, characterized in that: The support rod (11) is coated with polytetrafluoroethylene.

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