An all-focus ultrasonic testing system test block and test method

Abstract

A kind of full focus ultrasonic testing system test block and test method, the test block includes test body, circular arc row hole, dense hole, variable direction discontinuity, corrosion recess area, resolution test hole, upper blind area groove, lower blind area groove, initial angle calibration hole, terminal angle calibration hole, test surface, the beneficial effects of the present application are to realize the determination of more than two signal screen linearity of full focus ultrasonic testing system, fan scanning angle range error and angle resolution test, different orientation discontinuous full focus image detection capability test, dense defect spatial resolution capability test, the detection capability of inner wall defect caused by wall thickness change or corrosion etc. And longitudinal resolution test, full focus detection upper and lower surface blind area test; Meet the detection precision and system performance test demand of current full focus ultrasonic testing system.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of nondestructive testing, in particular to a full-focus ultrasonic testing system test block and a test method for testing the precision and performance of a full-matrix acquisition / full-focus testing system in nondestructive testing full-focus phased array testing technology. BACKGROUND

[0002] As a new ultrasonic post-processing imaging technology, the full-focus method (TFM) is based on the post-processing of the data set of phased array full-matrix capture (FMC) and realizes the virtual focusing of each point on the grid of the imaging area, has the advantages of high imaging resolution and flexible algorithm, and has rapidly become the "golden rule" in the field of ultrasonic nondestructive testing.

[0003] Full-focus ultrasonic testing technology has important significance in the field of industrial nondestructive testing. Currently, the International Organization for Standardization has issued two international standards, ISO 23865:2021 "Nondestructive Testing Ultrasonic Testing Full-Matrix Acquisition Full-Focus (FMC / TFM)" and ISO 23864:2021 "Weld Nondestructive Testing Ultrasonic Testing Automatic Full-Focus Technology (TFM)". Domestic related standards are also being drafted. At present, ultrasonic testing instruments applying full-focus imaging have been launched at home and abroad, such as the GEKKO phased array ultrasonic testing instrument of the French M2M company, which can realize a real-time and adaptive full-focus imaging system; for example, the TOPAZ64 phased array ultrasonic testing instrument launched by the ZETEC company, and the full-focus phased array instrument innovated by Wuhan Zhongkechuang.

[0004] After searching, patent number 201911389168.5 discloses an ultrasonic phased array fast full-focus imaging detection method based on defect pre-positioning, which includes plane wave and full-matrix capture data acquisition on the target imaging area; coarse discretization processing of the imaging target imaging area, phase shift processing of the plane wave echo signal data set, obtaining the plane wave imaging result, and pixel value analysis processing; defect positioning analysis of the plane wave imaging result through threshold processing, fine discretization processing of the pixel points containing defects, phase shift processing of the full-matrix echo signal data set, and obtaining the pixel value of the pixel points containing defects; interpolation and amplification coefficient processing of the unselected pixel points in the plane wave imaging result, filling to the corresponding grid; and obtaining the final imaging result. The method of the present application combines ultrasonic phased array plane wave algorithm with full-focus algorithm, improves the time resolution while maintaining the spatial resolution, performs fast ultrasonic phased array imaging detection on the component, and effectively evaluates the defects. This patent is not related to full-focus ultrasonic testing systems, and does not involve the detection precision and performance of the equipment.

[0005] The invention patent with patent number 202110805782.6 discloses a flash welding butt joint copper-aluminum transition clamp phased array ultrasonic detection test block and a detection method. The flash welding butt joint copper-aluminum transition clamp phased array ultrasonic detection test block comprises a first test block for weld defect inspection, a first copper block and a first aluminum block, a first weld seam part formed between the first copper block and the first aluminum block, a first circular defect structure arranged in the first weld seam part, a first strip-shaped defect structure arranged on the top surface of the first weld seam part, and a second strip-shaped defect structure arranged on the bottom surface of the first weld seam part. A second test block for heat affected zone defect comparison, a second copper block and a second aluminum block, a second weld seam part formed between the second copper block and the second aluminum block, a second heat affected zone, a second circular defect structure arranged inward on the side surface of the first heat affected zone, a third circular defect structure arranged inward on the side surface of the second heat affected zone, a third strip-shaped defect structure arranged on the top surface of the first heat affected zone, and a fourth strip-shaped defect structure arranged on the bottom surface of the second heat affected zone. However, it is not suitable for full-focus ultrasonic detection system.

[0006] In summary, the full-focus ultrasonic detection field has obtained many breakthrough results at home and abroad, and actively promotes the development of the non-destructive testing field in China. However, the detection accuracy and equipment performance of the full-focus ultrasonic detection system at home and abroad depend on the algorithm of the instrument software full-focus imaging. At present, there is no clear full-focus ultrasonic detection system test block to test the detection accuracy and performance of the equipment. SUMMARY

[0007] In order to overcome the shortcomings of the prior art, the present application provides a test block for testing the detection accuracy and performance of a full-focus ultrasonic detection system, which effectively solves the problem of detection accuracy and performance of the test equipment during full-focus ultrasonic detection system detection.

[0008] The technical scheme adopted by the present application to solve the above technical problems is:

[0009] The full-focus ultrasonic detection system test block comprises a test body, a circular arc row of holes, a dense hole, a variable direction discontinuity, a corrosion recess area, a resolution test hole, an upper blind area groove, a lower blind area groove, a starting angle calibration hole, a termination angle calibration hole, and a test surface.

[0010] The test body is a cuboid structure, and the upper surface of the cuboid structure is the test surface. The material organization of the test body is the same as that of the workpiece to be detected.

[0011] The arcuate row of holes is arranged at one end of the test body and is arranged as a quarter arc arrangement of a preset number of horizontal through holes I, forming a quarter arc surface structure, the starting point of the arc surface coincides with the upper surface of the test body, the center line of the arc surface is located on the test surface of the test body, the diameter of the arc is 20.0mm-100.0mm, the diameter of the horizontal through hole I is less than or equal to 2mm, the spacing angle between adjacent horizontal through holes I is less than or equal to 5° and the spacing is less than or equal to the diameter of the horizontal through hole I.

[0012] The dense holes are arranged in the middle of the test body and are arranged as 5-10 horizontal through holes II in a circular frame with a diameter of 10mm according to a predetermined rule, the hole diameter of the horizontal through hole II is 0.5mm-3.0mm. The horizontal and vertical spacing of adjacent horizontal through holes II is 0.5mm-1.5mm, and the spacing of at least two horizontal through holes II is 0.5mm, and there should be a shielding phenomenon between them in the direction of sound beam propagation.

[0013] The variable direction discontinuity is arranged between the arcuate row of holes and the dense holes and is arranged as two opposite direction arc structures, the arc diameter is 5.0mm-20.0mm, and a vertical surface with a depth greater than 1.0mm is formed at the connection position.

[0014] The corrosion recessed area is arranged on the lower surface of the test body and is a recessed area with an irregular corrosion structure, the recess depth is 0.0mm-10.0mm.

[0015] The resolution test hole is arranged at the bottom of the recessed area, the resolution test hole is arranged as 1-2 flat bottom holes, when arranged as 1, it is located at the center of the corrosion recessed area, when arranged as 2, the two flat bottom holes are symmetrically distributed relative to the center, and the spacing between the two holes is greater than or equal to 10.0mm, the diameter of the flat bottom hole is 1.0mm-3.0mm, and the depth of the flat bottom hole is 0.5mm-5.0mm.

[0016] The upper blind area groove and the lower blind area groove are arranged at the other end of the test body corresponding to the arcuate row of holes and are perpendicular to the upper surface and the lower surface of the test body respectively, the depth of the upper blind area groove and the lower blind area groove is arranged as 0.5-3.0mm.

[0017] The starting angle calibration hole and the ending angle calibration hole, the hole spacing of the starting angle calibration hole and the ending angle calibration hole is greater than or equal to 15mm, the starting angle calibration hole and the ending angle calibration hole are horizontal through holes III, the diameter of the horizontal through hole III is 3mm, and the horizontal through hole III is arranged 10mm below the test surface of the test body.

[0018] The present invention has the beneficial effects of enabling the measurement of high linearity of two or more signal screens in a fully focused ultrasonic testing system, testing of the angular range error and angular resolution of sector scanning, testing the ability to detect discontinuous fully focused images of different orientations, testing the spatial resolution of dense defects, testing the ability to detect inner wall defects caused by wall thickness variations or corrosion and testing the longitudinal resolution, and testing the blind spots of upper and lower surfaces during fully focused testing. This meets the current testing requirements for detection accuracy and system performance of fully focused ultrasonic testing systems. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Attachment Figure 1 This is a schematic diagram of the structure of the present invention.

[0020] 1. Test body, 2. Arc hole arrangement, 3. Dense hole arrangement, 4. Direction discontinuity, 5. Corrosion depression, 6. Resolution test hole, 7. Upper blind zone slot, 8. Lower blind zone slot, 9. Starting angle calibration hole, 10. Ending angle calibration hole, 11. Test surface. Implementation Method

[0021] Combined with attachment Figure 1 The present invention is further described in detail so that the public can better understand the implementation method of the present invention and the implementation of the technical solution of the present invention. Detailed implementation methods and specific operating steps are given, but the protection scope of the present invention is not limited to the following embodiments. The specific implementation methods of the present invention are as follows:

[0022] The test block of the fully focused ultrasonic testing system includes a test body 1, arc holes 2, dense holes 3, direction-changing discontinuities 4, corrosion depressions 5, resolution test holes 6, upper blind zone grooves 7, lower blind zone grooves 8, starting angle calibration holes 9, ending angle calibration holes 10, and a test surface 11.

[0023] The test surface 11 is the upper surface of the test body 1 . The smoothness requirement of the test surface 11 is Ra≤1.6 μm. The test surface 11 is the test reference surface of the test body 1 .

[0024] The starting point of the upper end surface of the arc-shaped hole array 2 is located at a position greater than or equal to 10.0 mm from the end of the test body 1. The arc-shaped hole array 2 has an arc radius of 20.0 mm to 100.0 mm, and the centerline of the arc-shaped hole array 2 is located on the test surface 11 of the test body 1. The arc-shaped hole array 2 is composed of transverse through-holes I with a diameter of less than or equal to 2.0 mm. Because the angle step is set to 1° during the sector scanning of the fully focused ultrasonic testing, to achieve the predetermined test angle range error and angular resolution, the center-to-center spacing angle of adjacent transverse through-holes I in the arc-shaped hole array 2 is less than or equal to 5°, and the spacing is less than or equal to the diameter of the transverse through-hole I. The angle between the first transverse through-hole I in the vertical direction is less than or equal to 2.5°.

[0025] The dense holes 3 are located in the middle of the test body 1, and are designed to correspond to the corrosion recess area 5. The dense holes 3 are relatively close to the direction-changing discontinuity 4. The purpose of this design is to use the space without defects on the upper part of the corrosion recess area 5 as the test incident area of the dense holes 3, and also to achieve the purpose of reducing the overall size of the test body 1, so that the test body 1 has the characteristics of lightweight. The dense holes 3 are 5-10 horizontal through holes II with a diameter of 0.5-3.0 mm. The dense holes 3 are arranged as follows: one horizontal through hole II is taken as the center, and the remaining horizontal through holes II are arranged around the center horizontal through hole II and distributed within a circular frame with a diameter of 10.0 mm. The commonly used full-focus ultrasonic detection probe frequency is 5-10 MHz, so that the horizontal wave detection is λ=c / f=0.65 mm, and the longitudinal wave detection is λ=c / f=1.18 mm. In theory, the resolution of ultrasonic detection is related to the wavelength, so that the lateral and longitudinal spacings between adjacent horizontal through holes II are between 0.5-1.5 mm, and at least one minimum value is 0.5 mm. In the direction of sound beam propagation, there should be a shielding phenomenon between them. When full-focus ultrasonic detection is performed, the image should clearly show each horizontal through hole II.

[0026] The direction-changing discontinuity 4 is designed to correspond to the circular-arc row holes 2. The direction-changing discontinuity 4 is an S-shaped structure composed of two opposite circular-arc structures, and the circular-arc radius is 5.0-20.0 mm. The upper end is a circular-arc outer arch surface, the middle is a vertical area with a thickness of greater than 1.0 mm, and the lower end is a circular-arc inner arch surface. The discontinuity direction changes continuously from the horizontal direction to the vertical direction and from the inner arch surface to the outer arch surface. The radius area of the circular-arc row holes 2 is used as the detection incident area of the direction-changing discontinuity 4 to achieve the purpose of reducing the overall size of the test body 1, so that the test body 1 has the characteristics of lightweight. When full-focus ultrasonic detection is performed, the image should clearly show all the directional features of the direction-changing discontinuity 4.

[0027] The corrosion recess area 5 is arranged on the lower surface of the test body 1 and has an irregular corrosion structure. The recess depth is 0.0-10.0 mm, which represents the non-uniformity of real corrosion. The corrosion recess area 5 surface is bonded with metal powder to represent the actual state of corrosion. When full-focus ultrasonic detection is performed, the image should clearly show the thickness change of each corrosion recess area 5 in the longitudinal direction.

[0028] The resolution test hole 6 is arranged in groups with the corrosion recessed area 5, the resolution test hole 6 is arranged at the bottom of the corrosion recessed area 5, the resolution test hole 6 is arranged as 1-2 flat-bottomed holes, when arranged as 1, located at the center of the corrosion recessed area 5, the diameter is 1.0 mm, the hole depth is 1.0 mm; when arranged as 2, the two flat-bottomed holes are symmetrically distributed relative to the center, and the distance between the two flat-bottomed holes is greater than or equal to 10.0 mm, the diameter of the flat-bottomed hole is 1.0 mm-3.0 mm, and the depth of the flat-bottomed hole is 0.5 mm-5.0 mm. The hole depth of the resolution test hole 6 represents the resolution of the longitudinal identification of the corrosion area detected by the full-focusing ultrasonic detection system; the combination of the corrosion recessed area 5 and the resolution test hole 6 can represent the detection ability and longitudinal resolution of the test of the inner wall defects caused by the change of wall thickness or corrosion and the like.

[0029] The upper blind area groove 7, the lower blind area groove 8, the start angle calibration hole 9 and the end angle calibration hole 10 are located at the other end of the test body 1 and on a vertical line, and are greater than or equal to 40.0 mm away from the end face, meeting the requirement of the secondary wave covering the upper surface.

[0030] The upper blind area groove 7 and the lower blind area groove 8 are respectively located on the upper surface and the lower surface of the test body 1, the upper blind area groove 7 is located on the test surface 11 and is perpendicular to the test surface 11; the lower blind area groove 8 is located on the lower surface of the test body 1 and is perpendicular to the lower surface. The groove depth is 0.5-3.0 mm; the test of the full-focusing detection of the upper and lower surface blind areas, when the full-focusing ultrasonic detection is carried out, the image can be clearly displayed.

[0031] The end angle calibration hole 10 is greater than or equal to 10 mm away from the upper blind area groove 7; the start angle calibration hole 9 is greater than or equal to 10.0 mm away from the lower blind area groove 8, the distance between the end angle calibration hole 10 and the start angle calibration hole 9 is greater than or equal to 15.0 mm; the end angle calibration hole 10 and the start angle calibration hole 9 are horizontal through holes III with a diameter of 3.0 mm, when other angle calibration holes are needed to be calibrated, the other angle calibration holes are arranged between the two horizontal through holes III, or the probe is moved to make the angle to be calibrated align with the start angle calibration hole; used for the determination of the signal screen linearity of two or more than two of the start angle and the end angle during the fan-shaped scanning of the full-focusing ultrasonic detection system; when the full-focusing ultrasonic detection is carried out, the image display color is close to the two signal screens.

[0032] The direction of the discontinuity is continuously changed with the extension direction.

[0033] The start angle is the angle between the lower edge of the fan shape and the vertical direction during the full-focusing phased array detection.

[0034] The end angle is the angle between the upper edge of the fan shape and the vertical direction during the full-focusing phased array detection.

[0035] The test method of the test block of the full-focus ultrasonic detection system:

[0036] The specific test method of the circular arc row hole 2 is that in the full-focus ultrasonic detection system fan-shaped scanning mode, the probe is placed at the center position of the circular arc row hole 2 on the test surface 11 of the test body 1, and the full-focus ultrasonic detection display fan-shaped area can clearly display the radian of the circular arc row hole 2; and the echo amplitude difference of each adjacent horizontal through hole I in the circular arc row hole 2 is greater than or equal to 6 dB, and the color can be clearly distinguished. In this way, the test of the fan-shaped scanning angle range error and the angle resolution of the full-focus ultrasonic detection system in actual detection is completed.

[0037] The specific test method of the dense hole 3 is that in the full-focus ultrasonic detection system fan-shaped scanning mode, the probe is placed on the test surface 11 of the test body 1 without defects above the corrosion recessed area 5, so that the fan-shaped display covers the dense hole 3; the full-focus ultrasonic detection display fan-shaped area can clearly display each horizontal through hole II in the dense hole 3, and the center horizontal through hole II blocked can also be clearly displayed, and the echo amplitude difference of each adjacent horizontal through hole II in the dense hole 3 is greater than or equal to 6 dB, and the color can be clearly distinguished. In this way, the test of the spatial resolution of the dense defect of the full-focus ultrasonic detection system in actual detection is completed.

[0038] The specific test method of the variable direction discontinuity 4 is that in the full-focus ultrasonic detection system fan-shaped scanning mode, the probe is placed at the center gap position of the circular arc row hole 2 on the test surface 11 of the test body 1, so that the fan-shaped display covers the variable direction discontinuity 4, and the details of each direction change can be clearly displayed on the fan-shaped scanning image of the full-focus ultrasonic detection system, and the measured length and height on the fan-shaped scanning image are within the error range of the actual size of the variable direction discontinuity 4. In this way, the test of the full-focus image detection capability of different orientation discontinuities of the full-focus ultrasonic detection system in actual detection is completed.

[0039] The specific test method of the corrosion recessed area 5 and the resolution test hole 6 is that in the full-focus ultrasonic detection system fan-shaped scanning mode, the probe is placed on the test surface 11 of the test body 1 without defects above the corrosion recessed area 5, and the longitudinal fan-shaped / linear scanning is performed, and the full-focus ultrasonic detection fan-shaped / linear scanning image can clearly display the corrosion profile of the corrosion recessed area 5 and clearly display the resolution test hole 6, and the reflection echo of the resolution test hole 6 and the structure echo amplitude difference of the surrounding corrosion recessed area 5 are greater than or equal to 6 dB, and the color can be clearly distinguished. In this way, the test of the detection capability of the inner wall defect caused by wall thickness change or corrosion and the longitudinal resolution of the full-focus ultrasonic detection system in actual detection is completed.

[0040] The specific test method of the upper blind area groove 7 and the lower blind area groove 8 is that the probe is placed on the test surface 11 of the test body 1, the fan-shaped scanning display area of the full-focus ultrasonic detection system is covered by a first wave in the middle and below the test block, and is covered by a second wave in the middle and above the test block, the fan-shaped scanning image can clearly display the upper blind area groove 7 and the lower blind area groove 8, and the test height of the two defects meets the error requirement. The test of the upper and lower surface blind areas in the actual detection of the full-focus ultrasonic detection system is completed.

[0041] The specific test method of the start angle calibration hole 9 and the end angle calibration hole 10 is that the probe is placed on the test surface 11 of the test body 1 in the fan-shaped scanning mode of the full-focus ultrasonic detection system, the probe is placed on the test surface 11 and aligned with the start angle calibration hole 9 and the end angle calibration hole 10, and the probe is moved forward and backward, so that the start angle calibration hole 9 appears at the edge of the start angle of the fan-shaped scanning image, and the end angle calibration hole 10 appears at the edge of the end angle of the fan-shaped scanning image, and the echo amplitudes of the two holes are consistent, which meets the requirement. The test of the fan-shaped scanning start angle and end angle signal screen height linearity of the full-focus ultrasonic detection system is completed.

[0042] The present application solves the test problem of the precision and performance of the full-focus ultrasonic detection system by arranging the circular arc hole, the dense hole, the variable phase discontinuity, the corrosion recess area, the resolution test hole, the upper blind area groove, the lower blind area groove, the start angle calibration hole and the end angle calibration hole on the test body, and reasonably arranging the relative positions of the contained structures. The test of the fan-shaped scanning start angle and end angle signal screen height linearity, the fan-shaped scanning angle range error and the angle resolution, the detection ability of different orientation discontinuous full-focus images, the spatial resolution ability of dense defects, the detection ability of inner wall defects caused by wall thickness changes or corrosion and the longitudinal resolution, and the test of the upper and lower surface blind areas of the full-focus detection are realized. The test demand of the detection precision and system performance of the current full-focus ultrasonic detection system is met.

Claims

1. A test block for a fully focused ultrasonic testing system, comprising a test body (1), arc-shaped holes (2), dense holes (3), a direction-changing discontinuity (4), a corrosion depression (5), a resolution test hole (6), an upper blind zone groove (7), a lower blind zone groove (8), a starting angle calibration hole (9), an ending angle calibration hole (10), and a test surface (11); characterized in that: The test surface (11) is the upper surface of the test body (1), the smoothness requirement of the test surface (11) is Ra≤1.6μm, and the test surface (11) is the test reference surface of the test body (1); The position of the test body (1) greater than or equal to 10.0 mm from the end is the starting position of the upper end surface of the arc hole (2), the arc radius of the arc hole (2) is 20.0 mm to 100.0 mm, the center line of the arc hole (2) is on the test surface 11 of the test body 1, the arc hole (2) is composed of transverse through holes I with a diameter less than or equal to 2.0 mm, the angle step is set to 1° during the sector scanning of the full-focused ultrasonic detection, in order to achieve the predetermined test angle range error and angle resolution, the center spacing angle of adjacent transverse through holes I of the arc hole (2) is less than or equal to 5° and the spacing is less than or equal to the diameter of the transverse through hole I, and the angle between the first transverse through hole I in the vertical direction and the vertical direction is less than or equal to 2.5°; The dense holes (3) are located in the middle of the test body (1) and are designed to correspond to the corrosion depression area (5). The dense holes (3) are relatively close to the direction-changing discontinuity (4). The purpose of this design is to use the defect-free space above the corrosion depression area (5) as the test incident area of ​​the dense holes (3); The direction-changing discontinuity (4) is designed to correspond to the arc hole arrangement (2). The direction-changing discontinuity (4) is an S-shaped structure composed of two arc structures in opposite directions, with an arc radius of 5.0 mm to 20.0 mm, an outer arc surface at the upper end, a vertical area greater than 1.0 mm in the middle, and an inner arc surface at the lower end, representing a continuous change in the discontinuous direction from the horizontal direction to the vertical direction and from the inner arc surface to the outer arc surface. The corrosion depression area (5) is arranged on the lower surface of the test body (1) and has an irregular corrosion structure, and the depression depth is 0.0 mm to 10.0 mm; The resolution test hole (6) is arranged in a group with the corrosion depression area (5), and the resolution test hole (6) is arranged at the bottom of the corrosion depression area (5). The resolution test hole (6) is arranged as 1 to 2 flat-bottom holes. When one is arranged, it is located at the center of the corrosion depression area (5), has a diameter of 1.0 mm, and a hole depth of 1.0 mm. When two are arranged, the two flat-bottom holes are symmetrically distributed relative to the center, and the spacing between the two flat-bottom holes is greater than or equal to 10.0 mm. The diameter of the flat-bottom hole is 1.0 mm to 3.0 mm, and the depth of the flat-bottom hole is 0.5 mm to 5.0 mm. The upper blind zone groove (7), the lower blind zone groove (8), the starting angle calibration hole (9) and the ending angle calibration hole (10) are located at the other end of the test body (1) and are located on a vertical line, with a distance from the end face greater than or equal to 40.0 mm, meeting the requirement that the secondary wave covers the upper surface.

2. The test block according to claim 1, characterized in that: The dense holes (3) are 5 to 10 transverse through holes II with a diameter of 0.5 mm to 3.0 mm. The dense holes (3) are arranged as follows: with one transverse through hole II as the center, the remaining transverse through holes II are arranged around the central transverse through hole II and distributed in a circular frame with a diameter of 10.0 mm; the lateral spacing and longitudinal spacing of adjacent transverse through holes II are between 0.5 mm and 1.5 mm, and there is at least a minimum value of 0.5 mm, and there should be an obstruction phenomenon between them in the direction of sound beam propagation; during full-focus ultrasonic testing, the image is qualified to be able to clearly display each transverse through hole II.

3. The test block according to claim 1, characterized in that: The upper blind zone groove (7) and the lower blind zone groove (8) are respectively located on the upper surface and the lower surface of the test body (1); the upper blind zone groove (7) is located on the test surface (11) and is perpendicular to the test surface (11); and the lower blind zone groove (8) is located on the lower surface of the test body (1) and is perpendicular to the lower surface.

4. The test block according to claim 1, characterized in that: The end angle calibration hole (10) is greater than or equal to 10 mm from the upper blind zone groove (7); the start angle calibration hole (9) is greater than or equal to 10.0 mm from the lower blind zone groove (8); the distance between the end angle calibration hole (10) and the start angle calibration hole (9) is greater than or equal to 15.0 mm; the end angle calibration hole (10) and the start angle calibration hole (9) are transverse through holes III with a diameter of 3.0 mm.

5. The method for testing a test block of a fully focused ultrasonic testing system according to any one of claims 1 to 4, wherein: The specific test method of the arc hole array (2) is as follows: in the sector scanning mode of the fully focused ultrasonic detection system, the probe is placed at the center of the arc hole array (2) on the test surface (11) of the test body (1), and the fully focused ultrasonic detection shows that the sector area can clearly show the curvature of the arc hole array (2); and the difference in the echo amplitude of each adjacent transverse through hole I in the arc hole array (2) is greater than or equal to 6dB, and the color can be clearly distinguished; the test of the sector scanning angle range error and angle resolution in the actual detection of the fully focused ultrasonic detection system is completed; The specific test method of the dense holes (3) is as follows: in the sector scanning mode of the fully focused ultrasonic detection system, the probe is placed on the test surface 11 of the test body 1, and the defect-free part above the depressed area (5) is corroded so that the sector display covers the dense holes (3); the fully focused ultrasonic detection shows that the sector area can clearly display each transverse through hole II in the dense holes (3), and the blocked central transverse through hole II can also be clearly displayed, and the echo amplitude difference of each adjacent transverse through hole II in the dense holes (3) is greater than or equal to 6dB, and the color can be clearly distinguished; the test of the spatial resolution ability of dense defects in actual detection of the fully focused ultrasonic detection system is completed; The specific test method of the direction-changing discontinuity (4) is as follows: in the sector scanning mode of the fully focused ultrasonic detection system, the probe is placed on the test surface (11) of the test body (1), at the center of the arc hole (2) so that the sector display covers the direction-changing discontinuity (4), and the details of each direction change can be clearly displayed on the sector scanning image of the fully focused ultrasonic detection system, and the measured length and height on the sector scanning image are consistent with the actual size of the direction-changing discontinuity (4) within the error range; thereby completing the test of the fully focused image detection capability of the fully focused ultrasonic detection system for discontinuities in different orientations in actual detection; The specific test method of the corrosion depression area (5) and the resolution test hole (6) is as follows: in the sector scanning mode of the fully focused ultrasonic detection system, the probe is placed on the test surface (11) of the test body (1), and the area above the corrosion depression area (5) without defects is longitudinally sectored / linearly scanned. The sector / linear scanning image of the fully focused ultrasonic detection can clearly show the corrosion contour of the corrosion depression area (5), can clearly show the resolution test hole (6), and the difference in amplitude between the reflected echo of the resolution test hole (6) and the structural echo of the surrounding corrosion depression area (5) is greater than or equal to 6dB, and the color can be clearly distinguished; the detection capability of the inner wall defects caused by wall thickness changes or corrosion and the longitudinal resolution test of the fully focused ultrasonic detection system in actual detection is completed; The specific test method of the upper blind zone groove (7) and the lower blind zone groove (8) is as follows: placing the probe on the test surface (11) of the test body (1), and in the sector scanning mode of the fully focused ultrasonic detection system, making the sector scanning display area have the primary wave covering the middle and lower areas of the test block; the secondary wave covering the middle and upper areas, the sector scanning image can clearly display the upper blind zone groove (7) and the lower blind zone groove (8), and the test height and actual height of the two defects meet the error requirements; completing the test of the upper and lower surface blind areas in the actual detection of the fully focused ultrasonic detection system; The specific test method of the starting angle calibration hole (9) and the ending angle calibration hole (10) is as follows: placing a probe on a test surface (11) of a test body (1); in a sector scanning mode of a fully focused ultrasonic detection system, placing the probe on the test surface (11) and aligning the starting angle calibration hole (9) and the ending angle calibration hole (10); moving the probe back and forth so that the starting angle calibration hole (9) appears at the starting angle edge of the sector scanning image, and the ending angle calibration hole (10) appears at the ending angle edge of the sector scanning image; the echo amplitudes displayed by the two holes are consistent, which meets the requirements; and completing the test of the high linearity of the signal screen of the starting angle and ending angle of the sector scanning of the fully focused ultrasonic detection system.

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