Water immersion method ultrasonic fusion depth high-precision detection device and method

Abstract

The invention discloses a water immersion method ultrasonic fusion depth high-precision detection device and method, and belongs to the field of nondestructive detection.The device comprises a three-axis truss, an angle adjusting module, a probe module, a water tank and a detection platform; the three-axis truss is used for adjusting the position of the angle adjusting module; the angle adjusting module is used for adjusting the angle of the probe module by taking the vertical shaft as a rotating shaft; the probe module comprises an outer sleeve, a rotating seat and a probe body, the probe body is fixed in the rotating seat, the rotating seat is rotatably connected in the outer sleeve through a horizontally arranged rotating pin shaft, and the outer sleeve is also provided with a plurality of locking screws for locking the rotating seat; the water tank is arranged below the probe module; and the detection platform is arranged in the water tank. The optimal reflection echo is obtained by calculating the incident angle of the probe body and repeatedly adjusting, and the rotating seat is fixed by the locking screw, so that the incident angle does not change any more, and misjudgment on the result due to change of the water layer and the incident angle of the probe is avoided.

Description

Technical Field

[0001] The invention belongs to the technical field of nondestructive testing, and in particular relates to a high-precision detection device and method for ultrasonic penetration depth using a water immersion method. Background Art

[0002] The reactor internals of a nuclear power plant are the key main equipment of the reactor. The semi-square tube of the guide tube assembly of the internal components is welded by plasma laser welding, and is bent and welded after being bent by a high-precision bending process. The welding groove type is "I" type. According to the relevant design and process requirements, in order to ensure that the internal insert parts of the semi-square tube have accurate and good passability, the weld cannot be fully penetrated. However, to ensure its corresponding design strength, it is necessary to verify that the weld penetration is at least 3.0mm by some detection means to ensure the safety of the nuclear power plant core in the 70-year full life operation. The main difficulty in measuring the penetration depth is that the bending edge is close to the weld, the weld penetration is small, the vertical section of the unpenetrated area is small, and the detection accuracy requirements are extremely high. In addition, even if the weld penetration meets the requirements, other types of discontinuous welding defects (such as pores, etc.) may occur in local areas during the welding process. It is more difficult to accurately detect the penetration depth of these areas.

[0003] In the prior art, foreign countries usually use manual direct contact method for detection. During the detection process, due to the change of the refraction angle of the probe, the change of the coupling layer thickness, the insufficient overlap rate of the probe, etc., the detection results are unreliable and inefficient. In China, manual water immersion method is usually used for detection. This method makes a simple tooling to contact the workpiece and manually pushes the tooling for detection. During the pushing process, slippage often occurs, and uniform motion cannot be guaranteed. The incident angle of the probe is easy to change, which leads to abnormal wave height display, unreliable result data, and poor repeatability. Repeated use of the tooling will cause wear, resulting in changes in the water layer distance, thereby changing the detection sensitivity and misjudging the results. During the direct contact pushing process, scratches are easily generated on the surface of the workpiece, resulting in unqualified visual inspection. In addition to precise equipment adjustment, the manual operation of the whole process requires each semi-square tube to be immersed in water four times at a speed of no more than 100mm / s (or even less). It is a great test for the physical and mental quality and work mood of the detection personnel. If you are not careful, it will cause missed judgments and misjudgments. Summary of the invention

[0004] The purpose of the present invention is to provide a high-precision detection device and method for ultrasonic penetration by water immersion method, so as to solve the problems existing in the existing water immersion method for detection, such as the incident angle of the probe is easy to change, the misjudgment caused by the change of the water layer distance, the scratches on the workpiece surface, and the difficulty in controlling the detection speed.

[0005] In order to achieve the above object, the technical solution of the present invention is as follows:

[0006] The present invention relates to a high-precision detection device for ultrasonic penetration by water immersion method, which comprises a three-axis truss, an angle adjustment module, a probe module, a water tank and a detection platform; the three-axis truss is used to adjust the position of the angle adjustment module; the angle adjustment module is used to adjust the angle of the probe module with a vertical axis as a rotation axis; the probe module comprises an outer sleeve, a rotating seat and a probe body, the probe body is fixed in the rotating seat, the rotating seat is rotatably connected in the outer sleeve through a horizontally arranged rotating pin shaft, and the outer sleeve is also provided with a plurality of locking screws for locking the rotating seat; the water tank is arranged below the probe module for containing deionized water; the detection platform is arranged in the water tank for placing the detection piece.

[0007] Preferably, the three-axis truss includes a column, a Y-axis track, an X-axis track and a Z-axis track, the Y-axis track is fixed to the top of the column, the X-axis track is slidably connected to the Y-axis track, and the Z-axis track is slidably connected to the X-axis track; the angle adjustment module is slidably connected to the Z-axis track; the probe module is fixed below the angle adjustment module through a vertical support.

[0008] Preferably, the angle adjustment module includes a base, a rotating shaft, a spring and a positioning bead. The rotating shaft is rotatably connected to the base. The side walls of the rotating shaft and the interior of the base are provided with symmetrically arranged holes. One end of the spring is fixed to the bottom of the hole of the rotating shaft or to the bottom of the hole of the base, and the positioning bead is fixed to the other end of the spring.

[0009] Preferably, the detection platform includes a base plate and several support blocks, a plurality of universal rollers are provided at the bottom of the base plate, the support blocks are arranged parallel to the upper surface of the base plate, a V-shaped groove is provided on the upper edge of the support block, and the two side walls of the V-shaped groove form an angle of 90 degrees; the universal roller is fixed to the edge of the base plate by bolts, the bolts are threadedly connected to the base plate, and the universal roller is fixed to the bottom of the bolts.

[0010] Preferably, the outer sleeve and the rotating seat are both annular structures, and the probe body is provided with a probe line for connecting to an ultrasonic detector, and the probe line extends from the inner cavity of the annular structure of the outer sleeve and the rotating seat to the ultrasonic detector.

[0011] Preferably, the probe body is a focusing probe.

[0012] The present invention also relates to a method for high-precision detection of ultrasonic penetration by water immersion method, which is implemented based on the above-mentioned high-precision detection of ultrasonic penetration by water immersion method, and comprises the following steps:

[0013] S1. Make a comparison simulation;

[0014] S2. Place the test platform in a water tank and place the comparison simulation piece, and fill the water tank with deionized water;

[0015] S3. Adjust the angle adjustment module and the position of the probe module through the three-axis truss, and adjust the angle of the probe module in the horizontal direction through the angle adjustment module;

[0016] S4. Calculate the incident angle of the probe body based on the bending angle at the detection position of the comparison simulation part, and repeatedly adjust the rotating seat so that the incident angle of the probe body meets the calculated result, thereby obtaining the optimal reflected echo, and fix the rotating seat by locking screws so that the incident angle of the probe body does not change;

[0017] S5. Replace the comparison simulation part with the test part, move the probe body at a constant speed along the X-axis direction through the triaxial truss, and record the wave heights of the test part and the different groove depth positions on the side wall of one side of the test part;

[0018] S6. Rotate the angle adjustment module 180° and position it, and adjust the position of the probe body in the Y-axis direction through the three-axis truss, so that the probe body faces the other side of the test piece, and move the probe body at a constant speed along the X-axis direction through the three-axis truss to record the wave height at different groove depths on the side wall of the other side of the test piece.

[0019] Preferably, the calculation formula for calculating the incident angle of the probe body in S4 based on the bending angle at the detection position of the comparison simulation part is:

[0020] Sinα·C L(水) = sin(β)·C S(钢) ,

[0021] Where α is the incident angle of the probe body, C L(水) is the speed of sound of longitudinal waves in water, C S(钢) is the sound velocity of transverse waves in steel, and β is the bending angle of the test piece minus 90°.

[0022] Preferably, the probe body adopts a focusing probe, and the focal column length and focal column diameter are also calculated in S4;

[0023] The calculation formula of the focal column length is:

[0024] L=λF2 / R 2 ,

[0025] Wherein, L represents the focal length, F represents the actual focal length of the probe body in water, λ represents the wavelength, and R represents the radius of the wave source;

[0026] The calculation formula of the focal column diameter is:

[0027] d = λF / 2R,

[0028] Where, d represents the focal column diameter;

[0029] The position of the probe body is adjusted by the three-axis truss so that the water layer thickness is no greater than the focal column length and the detection point is within the focal column diameter.

[0030] Preferably, the specific steps of S1 for making the comparison simulation part are:

[0031] S1.1. Make a comparison simulation part, the material, size, plate thickness, bending angle and surface condition of which are exactly the same as those of the test part;

[0032] S1.2. Use the coaxial line to symmetrically groove on both sides to carve rectangular grooves on the surface of the comparison simulation part to simulate the weld;

[0033] S1.3. Drill through holes at both ends of the rectangular slot to simulate porosity-type defects in the weld.

[0034] Compared with the prior art, the technical solution provided by the present invention has the following beneficial effects:

[0035] 1. The probe module of the water immersion ultrasonic penetration high-precision detection device involved in the present invention includes an outer sleeve, a rotating seat and a probe body. The probe body is fixed in the rotating seat, and the rotating seat is rotatably connected to the outer sleeve through a horizontally arranged rotating pin. The outer sleeve is also provided with a plurality of locking screws for locking the rotating seat. Before use, the incident angle of the probe body is calculated based on the bending angle at the detection position of the comparison simulation part, and the rotating seat is repeatedly adjusted so that the incident angle of the probe body meets the calculated result, thereby obtaining the optimal reflected echo. The rotating seat is fixed by the locking screw so that the incident angle of the probe body no longer changes, so as to ensure the reliability of the result data.

[0036] 2. In the detection process of the water immersion ultrasonic penetration high-precision detection device involved in the present invention, a three-axis truss is used to replace the manual movement of the probe body, so that the speed control is more accurate, avoiding missed judgment, misjudgment and the like.

[0037] 3. The water immersion ultrasonic penetration high-precision detection method involved in the present invention simulates the test piece by making a comparative simulation piece, adjusts the optimal probe incident angle, and determines the water layer thickness before testing the test piece, thereby ensuring the sensitivity of the detection and avoiding misjudgment of the result due to changes in the water layer and the probe incident angle. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a three-dimensional diagram of a high-precision detection device for ultrasonic penetration depth by water immersion method according to the present invention;

[0039] Figure 2 It is a side view of the high-precision detection device for ultrasonic penetration depth by water immersion method according to the present invention;

[0040] Figure 3 This is a detailed structural diagram of the angle adjustment module;

[0041] Figure 4 The following is a detailed diagram of the structure of the probe module.

[0042] Among them, 1-three-axis truss, 11-column, 12-Y-axis track, 13-X-axis track, 14-Z-axis track, 2-angle adjustment module, 21-base, 22-rotation axis, 23-spring, 24-positioning bead, 3-probe module, 31-outer sleeve, 32-rotation seat, 33-probe body, 34-rotation pin, 35-locking screw, 4-water tank, 5-detection platform, 51-bottom plate, 52-support block, 53-V-groove, 54-universal roller, 55-bolt. DETAILED DESCRIPTION

[0043] In order to further understand the content of the present invention, the present invention is described in detail in conjunction with examples. The following examples are used to illustrate the present invention but are not used to limit the scope of the present invention.

[0044] See attached Figure 1 and 2 As shown, a high-precision detection device for ultrasonic penetration depth by water immersion method according to the present invention comprises a three-axis truss 1, an angle adjustment module 2, a probe module 3, a water tank 4 and a detection platform 5.

[0045] The three-axis truss 1 includes a column 11, a Y-axis track 12, an X-axis track 13 and a Z-axis track 14. Two Y-axis tracks 12 are provided and fixed in parallel to the top of the column 11. The X-axis track 13 is slidably connected to the Y-axis track 12. The Z-axis track 14 is slidably connected to the X-axis track 13. The angle adjustment module 2 is slidably connected to the Z-axis track 14 up and down; the three-axis truss 1 is used to adjust the position of the angle adjustment module 2, including the positions in the three directions of the X-axis, Y-axis and Z-axis.

[0046] The angle adjustment module 2 includes a base 21, a rotating shaft 22, a spring 23 and a positioning bead 24. The rotating shaft 22 is rotatably connected to the base 21. The side wall of the rotating shaft 22 and the inside of the base 21 are provided with symmetrically arranged holes. One end of the spring 23 is fixed to the bottom of the hole of the rotating shaft 22, and the positioning bead 24 is fixed to the other end of the spring. Figure 3 As shown; the angle adjustment module 2 is used to adjust the angle of the probe module 3 with the vertical axis as the rotation axis, and the positioning bead 24 is inserted into the positioning hole of the base 31 by rotating the rotation axis 22 to achieve 180° precise positioning.

[0047] The probe module 3 is fixed to the bottom of the angle adjustment module 2 through a vertical support. The probe module 3 includes an outer sleeve 31, a rotating seat 32 and a probe body 33. The probe body 33 is fixed in the rotating seat 32. The rotating seat 32 is rotatably connected to the outer sleeve 31 through a horizontally arranged rotating pin 34. The outer sleeve 31 is also provided with a plurality of locking screws 35 for locking the rotating seat 32. Figure 4 As shown; the outer sleeve 31 and the rotating seat 32 are both annular structures, and the probe body 33 is provided with a probe line for connecting the ultrasonic detector, and the probe line extends from the inner cavity of the annular structure of the outer sleeve 31 and the rotating seat 32 to the ultrasonic detector. The probe body 33 adopts a focusing probe. When the diameter of the sound beam (focal column) is larger than the diameter of the flaw, the sound pressure reflection of the flaws of different specifications conforms to the square proportional relationship. At the same time, the ultrasonic field has a further focusing effect when entering the steel from the water, which is beneficial to the detection sensitivity.

[0048] The water tank 4 is arranged below the probe module 3 and is used to hold deionized water. The water tank 4 is welded by 304 stainless steel argon arc welding. A water inlet and a water outlet are arranged on the side wall of the water tank 4 to facilitate the filling and discharge of deionized water.

[0049] The detection platform 5 is arranged in the water tank 4 for placing the detection parts. The detection platform 5 includes a bottom plate 51 and a plurality of support blocks 52. The bottom of the bottom plate 51 is provided with a plurality of universal rollers. The bottom plate 51 is made of stainless steel. The support blocks 52 are arranged parallel to the upper surface of the bottom plate 51. Specifically, they are welded on the stainless steel bottom plate 51 by argon arc welding. The deformation should be controlled during the welding process to ensure that each support block 52 is in the same straight line. The upper edge of the support block 52 is provided with a V-shaped groove 53. The two side walls of the V-shaped groove 53 are at an angle of 90 degrees. In addition, the surface finish of the V-shaped groove 53 of the support block 52 is required to be Ra≤3.2μm to avoid scratches and indentations on the test parts. In addition, the universal roller 54 is fixed to the edge of the base plate 51 by bolts 55, the bolts are threadedly connected to the base plate 51, and the universal roller is fixed to the bottom of the bolts. In this way, the detection platform 5 can be leveled and the height adjusted by adjusting each bolt 55, so that the detection part placed on the support block 52 can remain parallel to the running track of the X-axis of the three-axis truss 1.

[0050] The present invention also relates to a method for high-precision detection of ultrasonic penetration by water immersion method, which is implemented based on the above-mentioned high-precision detection of ultrasonic penetration by water immersion method, and comprises the following steps:

[0051] S1. Make a comparison simulation part. The specific steps are as follows:

[0052] S1.1. Make a comparison simulation part, the material, size, plate thickness, bending angle and surface condition of which are exactly the same as those of the test part;

[0053] S1.2. Use the coaxial line to symmetrically groove on both sides to carve rectangular grooves on the surface of the comparison simulation part to simulate the weld;

[0054] S1.3. Considering the possible existence of porosity defects in the weld, through holes are drilled at both ends of the rectangular groove to simulate the porosity defects in the weld.

[0055] S2. Place the detection platform 5 into the water tank 4 and put in the comparison simulation piece, and fill the water tank 4 with deionized water.

[0056] S3. Adjust the positions of the angle adjustment module 2 and the probe module 3 through the three-axis truss 1, and adjust the angle of the probe module 3 in the horizontal direction through the angle adjustment module 2.

[0057] S4. Calculate the incident angle of the probe body 33 based on the bending angle at the detection position of the comparison simulation part. The calculation formula of the incident angle is:

[0058] Sinα·C L(水) = sin(β)·C S(钢) ,

[0059] Where α is the incident angle of the probe body, C L(水) is the speed of sound of longitudinal waves in water, C S(钢) is the sound velocity of transverse waves in steel, β is the bending angle of the test piece minus 90°;

[0060] The rotating seat 32 is repeatedly adjusted to make the incident angle of the probe body 33 conform to the calculated result, thereby obtaining the optimal reflected echo. The rotating seat 32 is fixed by the locking screw 35 so that the incident angle of the probe body 33 no longer changes.

[0061] To ensure relative sensitivity, the reflection surface should be within the theoretical length of the focal column as much as possible. The theoretical starting point of the focal column is generally selected at the focus. Therefore, the position of the reflection surface should be near the focal length, or slightly larger than the focal length. Because the sound field of the focused probe will be further focused when it enters the steel from the water (fixed water layer thickness, different sound speed), it is appropriate to take the focal length according to the reflection one-way sound. Therefore, the focal column length is calculated by the following formula:

[0062] L=λF2 / R 2 ,

[0063] Wherein, L represents the focal length, F represents the actual focal length of the probe body in water, λ represents the wavelength, and R represents the radius of the wave source;

[0064] When using this method, the reflective surface of the damage must be within the focal length as much as possible. Therefore, theoretical calculations and measurements of actual workpieces are required to determine the thickness of the water layer.

[0065] Analysis of the focal column diameter that should cover at least one cross section of the defect: In theory, if the focal column cannot cover any cross section of the defect, the reflected wave height will hardly change, or will change very little. Therefore, it is necessary to calculate the focal column diameter of the probe and compare it with the artificial defect to ensure coverage. This is crucial to the determination of the focusing probe parameters. Only when the focal column diameter is appropriate can different sound pressure reflected wave heights be generated for the reflective surfaces with different melting depths. In this embodiment, the focal column diameter is calculated by the following formula:

[0066] d = λF / 2R,

[0067] Where d is the focal column diameter.

[0068] Based on the above calculation results, the position of the probe body is adjusted through the three-axis truss so that the water layer thickness is not greater than the focal column length and the detection point is within the focal column diameter. At the same time, the optimal position is found through repeated adjustments.

[0069] Compared with the non-focused probe, the focal area of ​​the focused probe is a "double-headed horn" shape. Outside the focal column, it is divergent. Therefore, when determining the water layer thickness in combination with the focal length calculation result, it is necessary to appropriately increase the water layer thickness, and at the same time conduct a specific comparative verification test to obtain an obvious difference in the sound pressure reflection wave height. Based on the above, the Doppler I2-5C6F20 water immersion focused probe is selected, and the focusing type is point focusing.

[0070] S5. Replace the comparison simulation part with the test part, and move the probe body 33 uniformly along the X-axis direction through the triaxial truss 1 at a speed of ≤50mm / s, and record the wave height of the test part at different groove depths on the side wall of the test part;

[0071] S6. Rotate the angle adjustment module 2 180° and position it, and adjust the position of the probe body 33 in the Y-axis direction through the three-axis truss 1, so that the probe body 33 faces the other side of the test piece, and move the probe body 33 at a uniform speed along the X-axis direction through the three-axis truss 1 to record the wave heights at different groove depths on the side wall of the other side of the test piece.

[0072] Effect example:

[0073] This effect example uses plasma laser welding with 1KW, 2KW, 3KW, 4KW, 5KW and 6KW welding power parameters to weld a test piece, cut and sample it, and grind it. The penetration depth is observed and measured using a low-power microscope. The measurement data is as follows:

[0074] Table 1: Low-power microscope penetration observation measurement data

[0075]

[0076] The welding test piece was hoisted onto the water tank 4 detection platform 5, and the invention was used to detect the penetration depth at different welding parameter positions. The detection data are as follows:

[0077] Table 2: Welding test piece test data

[0078]

[0079] By using the present invention to detect weld test pieces with known weld penetration, the actual weld penetration can be accurately determined based on the reflection wave height of the incomplete weld / fusion portion of the weld. Based on the reflection wave height ratio, the accuracy can be at least 0.5 mm.

[0080] The present invention is described in detail above in conjunction with the embodiments, but the contents described are only preferred embodiments of the present invention and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made according to the scope of application of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. A high-precision ultrasonic penetration detection device using a water immersion method, characterized in that: It includes a three-axis truss, an angle adjustment module, a probe module, a water tank and a detection platform; the three-axis truss is used to adjust the position of the angle adjustment module; the angle adjustment module is used to adjust the angle of the probe module with the vertical axis as the rotation axis; the probe module includes an outer sleeve, a rotating seat and a probe body, the probe body is fixed in the rotating seat, the rotating seat is rotatably connected in the outer sleeve through a horizontally arranged rotating pin, and the outer sleeve is also provided with a plurality of locking screws for locking the rotating seat; the water tank is arranged below the probe module for holding deionized water; the detection platform is arranged in the water tank for placing the detection piece.

2. The high-precision ultrasonic penetration detection device using water immersion method according to claim 1 is characterized in that: The three-axis truss includes a column, a Y-axis track, an X-axis track and a Z-axis track. The Y-axis track is fixed to the top of the column, the X-axis track is slidably connected to the Y-axis track, and the Z-axis track is slidably connected to the X-axis track; the angle adjustment module is slidably connected to the Z-axis track; the probe module is fixed below the angle adjustment module through a vertical support.

3. The high-precision detection device for ultrasonic penetration by water immersion method according to claim 1 is characterized in that: The angle adjustment module includes a base, a rotating shaft, a spring and a positioning bead. The rotating shaft is rotatably connected to the base. The side wall of the rotating shaft and the inside of the base are provided with symmetrically arranged holes. One end of the spring is fixed to the bottom of the hole of the rotating shaft or to the bottom of the hole of the base, and the positioning bead is fixed to the other end of the spring.

4. The high-precision detection device for ultrasonic penetration by water immersion method according to claim 1 is characterized in that: The detection platform includes a base plate and several support blocks. Several universal rollers are provided at the bottom of the base plate. The support blocks are arranged parallel to the upper surface of the base plate. A V-shaped groove is provided on the upper edge of the support block. The two side walls of the V-shaped groove form a 90-degree angle. The universal roller is fixed to the edge of the base plate by bolts. The bolts are threadedly connected to the base plate, and the universal roller is fixed to the bottom of the bolts.

5. The high-precision ultrasonic penetration detection device using water immersion method according to claim 1 is characterized in that: The outer sleeve and the rotating seat are both annular structures. The probe body is provided with a probe line for connecting to an ultrasonic detector. The probe line extends from the inner cavity of the annular structure of the outer sleeve and the rotating seat to the ultrasonic detector.

6. The high-precision ultrasonic penetration detection device using water immersion method according to claim 1 is characterized in that: The probe body adopts a focusing probe.

7. A method for high-precision detection of ultrasonic penetration by water immersion method, which is based on the high-precision detection of ultrasonic penetration by water immersion method according to claim 1, characterized in that: It includes the following steps: S1. Make a comparison simulation; S2. Place the test platform in a water tank and place the comparison simulation piece, and fill the water tank with deionized water; S3. Adjust the angle adjustment module and the position of the probe module through the three-axis truss, and adjust the angle of the probe module in the horizontal direction through the angle adjustment module; S4. Calculate the incident angle of the probe body based on the bending angle at the detection position of the comparison simulation part, and repeatedly adjust the rotating seat so that the incident angle of the probe body meets the calculated result, thereby obtaining the optimal reflected echo, and fix the rotating seat by locking screws so that the incident angle of the probe body does not change; S5. Replace the comparison simulation part with the test part, move the probe body at a uniform speed along the X-axis direction through the triaxial truss, and record the wave heights of the test part and the different groove depth positions on the side wall of one side of the test part; S6. Rotate the angle adjustment module 180° and position it, and adjust the position of the probe body in the Y-axis direction through the three-axis truss, so that the probe body faces the other side of the test piece, and move the probe body at a constant speed along the X-axis direction through the three-axis truss to record the wave height at different groove depths on the side wall of the other side of the test piece.

8. The method for high-precision detection of ultrasonic penetration by water immersion according to claim 7, characterized in that: The calculation formula of S4 for calculating the incident angle of the probe body based on the bending angle at the detection position of the comparison simulation part is: Sinα·C L(水) = sin(β)·C S(钢) , Where α is the incident angle of the probe body, C L(水) is the speed of sound of longitudinal waves in water, C S(钢) is the sound velocity of transverse waves in steel, and β is the bending angle of the test piece minus 90°.

9. The method for high-precision detection of ultrasonic penetration by water immersion according to claim 7, characterized in that: The probe body adopts a focusing probe, and the focal column length and focal column diameter are also calculated in S4; The calculation formula of the focal column length is: L=λF2 / R 2 , Wherein, L represents the focal length, F represents the actual focal length of the probe body in water, λ represents the wavelength, and R represents the radius of the wave source; The calculation formula of the focal column diameter is: d = λF / 2R, Where, d represents the focal column diameter; The position of the probe body is adjusted by the three-axis truss so that the water layer thickness is no greater than the focal column length and the detection point is within the focal column diameter.

10. The method for high-precision detection of ultrasonic penetration by water immersion according to claim 7, characterized in that: The specific steps of S1 for making the comparison simulation part are: S1.

1. Make a comparison simulation part, the material, size, plate thickness, bending angle and surface condition of which are exactly the same as those of the test part; S1.

2. Use the coaxial line to symmetrically groove on both sides to carve rectangular grooves on the surface of the comparison simulation part to simulate the weld; S1.

3. Drill through holes at both ends of the rectangular slot to simulate porosity-type defects in the weld.

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