Radiographic detection device for super-thick welding test plate and detection method of radiographic detection device

Abstract

The invention discloses a ray detection device for an ultra-thick welding test plate, and relates to the technical field of nondestructive testing. The device comprises a walking wheel with a locking mechanism at the bottom, a main body supporting structure, a test plate platform, a small test plate platform, an adjustable test plate clamping mechanism and a detachable supporting rod. The length and the width of a bearing part of the main body supporting structure are not less than 1.5 m, the test plate platform and the small test plate platform are respectively arranged on two sides of the main body supporting structure, and the placing positions can be flexibly selected according to the size of a test plate. The effective stroke of the adjustable test plate clamping mechanism is 200mm, a test plate with the thickness not exceeding 200mm can be fixed, and the adjustable test plate clamping mechanism can be matched with a test plate fixing support column to adapt to thicker or wider test plates. The device can reduce the preparation work difficulty before detection, improve the detection safety and stability, is suitable for ray detection of super-thick welding test plates and conventional test plates, can realize one-time multi-piece transillumination, and improves the detection efficiency.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of nondestructive testing, and particularly relates to a kind of ray detection device for super-thick welding test plate and its detection method. BACKGROUND

[0002] In the field of nondestructive testing, for the ray detection of large plate and super-thick welding test plate, there are many problems in the prior art. Currently, the test plate is mainly laid on the ground, which makes it very inconvenient to attach the ray film, and even the film is easily damaged during the transmission process. This method is not suitable for floor type linear accelerator. Another way is to lean the test plate on other objects, but this method is not conducive to the detection personnel to attach the film on the back of the test plate, and the test plate may move during the transmission process, which poses a safety hazard and lacks detection stability.

[0003] To solve the above problems, the present application provides a kind of ray detection device for super-thick welding test plate, which is based on floor type industrial linear accelerator design, can reduce the difficulty of detection personnel to attach the film on the back of the test plate, eliminate safety hazards through test plate fixing device, improve the stability of ray detection, and also can complete the detection of conventional welding test plate with conventional X-ray machine. SUMMARY

[0004] The purpose of the present application is to provide a kind of ray detection device for super-thick welding test plate, to solve the problems of inconvenient test plate fixing, safety hazard and lack of detection stability in the prior art.

[0005] To achieve the above purpose, the present application provides a kind of ray detection device for super-thick welding test plate, characterized in that it comprises: walking wheels (1) at the bottom, the walking wheels (1) are provided with locking mechanisms; a main support structure (2) fixed above the walking wheels (1), the main support structure (2) comprises a load-bearing part (21) and a test plate support fixing part (22); a test plate platform (4) fixed on the test plate support fixing part (22) of the main support structure; a small test plate platform (5) fixed on the test plate support fixing part (22) and located on one side of the test plate platform (4); an adjustable test plate clamping mechanism (6) fixed on the test plate platform (4) and the small test plate platform (5); and a detachable support rod (7) fixed on the main support structure (2) and the test plate platform (4).

[0006] Further, the length and width of the load-bearing part (21) of the main support structure are not less than 1.5 meters; the height of the test plate platform (4) from the ground is 0.3 meters, and the test plate platform (4) is provided with test plate fixing pillars (3) and corresponding reserved holes (31); the height of the small test plate platform (5) from the ground is 0.6 meters, and the width is 0.1 meters.

[0007] Further, the effective stroke of the adjustable test plate clamping mechanism (6) is 200 mm, and the test plate with a thickness of not more than 200 mm can be clamped; the test plate clamping mechanism (6) can be moved and disassembled along the test plate support fixing part (22) to adapt to test plates of different sizes; and the test plate clamping mechanism (6) can be simply disassembled and flexibly moved on the test plate support fixing part (22).

[0008] The application also provides a method for radiographic testing of an ultra-thick welding test plate, which adopts the device and specifically comprises the following steps: S1, moving the device to a detection position and locking the walking wheels; S2, selecting a platform according to the size of the test plate, hoisting the test plate and fixing the test plate by using the clamping mechanism; S3, installing the detachable support rod (7) for reinforcement; S4, adjusting the parameters of the radiation source to complete the transmission.

[0009] Further, the small test plate platform (5) is suitable for welding test plates with a width of not more than 0.6 m and a thickness of not more than 200 mm; for test plates exceeding the size, the test plate fixing support (3) can be used for fixation, and the length of the test plate is not limited.

[0010] Further, welding test plates with a width of not more than 0.9 m can be fixed on the left side of the test plate platform (4); test plates with a thickness of not more than 200 mm can be directly fixed by using the adjustable test plate clamping mechanism (6); test plates with a width of more than 0.9 m or a thickness of more than 200 mm can be fixed by using the test plate fixing support (3), and the length of the test plate is not limited.

[0011] Further, the right side of the test plate platform (4) is detachable, and after being disassembled, it can be used for single X-ray transmission of multiple conventional welding test plates, and at least five test plates with a length of 300 mm can be detected at the same time.

[0012] Further, the transmission parameters include tube voltage, tube current and exposure time, and during the adjustment process, the bearing state of the test plate platform (4) or the small test plate platform (5) can be combined to form a corresponding adaptive relationship between the transmission parameters and the thickness of the test plate.

[0013] Further, when the accelerator is used for radiographic testing, the X-ray beam energy and the equivalent steel thickness range to be detected have the following corresponding relationship: When the X-ray beam energy is 1 MeV, the equivalent steel thickness range is 36 mm to 150 mm; When the X-ray beam energy is 2 MeV, the equivalent steel thickness range is 151 mm to 200 mm; when the X-ray beam energy is 4 MeV, the equivalent steel thickness ranges from 201 mm to 250 mm; when the X-ray beam energy is 6 MeV, the equivalent steel thickness ranges from 251 mm to 280 mm; when the X-ray beam energy is 9 MeV, the equivalent steel thickness ranges from 281 mm to 380 mm; when the X-ray beam energy is 12 MeV, the equivalent steel thickness ranges from 381 mm to 420 mm; when the X-ray beam energy is 15 MeV, the equivalent steel thickness ranges from 421 mm to 460 mm; wherein the equivalent steel thickness is the thickness of the plate converted based on the density of the steel being 7.85 x 10 3 kg / m 3 The X-ray beam energy and the equivalent steel thickness range are set in the above corresponding relationship, which firstly realizes the accurate matching of energy and steel thickness. Different energy X-ray beams have different penetration capabilities. The above corresponding relationship allows each energy X-ray beam to correspond to a specific and continuous equivalent steel thickness interval, which can ensure that the rays can obtain sufficient penetration when penetrating the corresponding thickness test plate to obtain clear imaging, and the image contrast will not decrease due to excessive energy, thereby ensuring the accuracy of the detection result. For example, the 2 MeV X-ray beam corresponds to the equivalent steel thickness of 151 mm to 200 mm, which can be accurately applied to the detection of test plates within this thickness range, avoiding detection errors caused by energy mismatch. Secondly, the detection efficiency is improved. The clear corresponding relationship allows the operator to quickly select the appropriate X-ray beam energy according to the equivalent steel thickness of the test plate, without the need to repeatedly adjust the energy parameters, thereby reducing the preparation time and speeding up the detection process. For the scene of detecting test plates of different thicknesses in batches, this efficient parameter selection method can significantly improve the overall detection efficiency. Thirdly, the safety of the detection is enhanced. Reasonable energy setting can avoid unnecessary radiation hazards caused by excessive energy. When the thickness of the test plate is in a lower range, the corresponding low-energy X-ray beam is selected, which can meet the detection requirements while reducing the radiation dose and reducing the impact on the operator and the surrounding environment, thereby meeting the requirements of safe detection. In addition, the application range of the device is expanded. The equivalent steel thickness range of 36 mm to 460 mm is covered by X-ray beams of different energies, so that the ray detection device and method can be applied to the detection of super-thick welded test plates of various thicknesses. Whether it is a thinner 36 mm test plate or a thicker 460 mm test plate, the corresponding appropriate energy parameters can be found, thereby improving the versatility and practicality of the device. Finally, it is easy to operate and promote. The clear and explicit corresponding relationship is simple and easy to understand, and the operator only needs to determine the X-ray beam energy according to the equivalent steel thickness of the test plate, which reduces the operation difficulty and is beneficial to the promotion and application of the detection technology. Especially for novice operators, it can quickly start the detection work.

[0014] Further, when performing X-ray detection by means of a conventional X-ray machine, the X-ray tube voltage U=(5T+85)+6TxF-0.8), T is the thickness of the test plate, and F is the focal length. When the calculated tube voltage value exceeds the rated voltage of the X-ray machine, or is higher than the maximum tube voltage allowed by the standard, the exposure amount can be corrected by means of the inverse square law of distance, and the tube voltage can be reduced by increasing the exposure time.

[0015] The formula takes into account two key parameters, the thickness (T) of the test plate and the focal length (F), and can calculate the adaptive tube voltage according to different test plate thicknesses and focal lengths during detection. The thickness of the test plate directly affects the difficulty of X-ray penetration, and the focal length is related to the intensity distribution of the X-ray. The combination of the two makes the calculated tube voltage better meet the penetration requirements and ensure that the X-ray can effectively penetrate the test plate and form a clear image, laying a foundation for the accuracy of the detection result. When the thickness or focal length is large, the formula will automatically calculate a relatively high tube voltage to ensure that the X-ray machine rated voltage or the maximum tube voltage allowed by the standard will automatically calculate a relatively high tube voltage to ensure the penetration effect. When the tube voltage calculated according to the formula exceeds the rated voltage of the X-ray machine or the maximum tube voltage allowed by the standard, the method of correcting the exposure amount by means of the inverse square law of distance provides a practical solution. By increasing the exposure time to make up for the insufficient X-ray intensity caused by the reduction of the tube voltage, it can not only avoid damage to the equipment caused by forced use of overrated voltage, but also meet the requirements of the standard for tube voltage, ensuring the safety of the detection process and the service life of the equipment. And without relying on a specific model or high-specification X-ray machine, even a conventional device with a lower rated voltage can meet the detection requirements of different thicknesses and focal lengths by formula calculation and exposure correction, widening the application range of conventional X-ray machines, avoiding the additional cost of replacing higher-specification equipment due to performance limitations, and having good economy.

[0016] The beneficial effects of the present application are: By reasonably setting the height and structure of the test plate platform and the small test plate platform, the detection personnel can conveniently perform the preparation work such as patching, placing lead type and image quality meter before and after the test plate, and the operation difficulty is reduced. The device is provided with a walking wheel locking mechanism and a test plate clamping mechanism, which can effectively prevent the device and the test plate from moving during the detection process, eliminate safety hazards, and improve the detection stability. It can be used for X-ray detection of super-thick welding test plates, and can be used with a floor type linear accelerator; it can also be used for conventional welding test plates, and can be used with a conventional X-ray machine to complete the detection, and can adapt to the fixing needs of test plates of different sizes. The right side of the test plate platform is detachable, and single multi-zooming of conventional test plates can be realized, at least 5 test plates with a length of 300 mm can be detected at the same time, and the detection efficiency is greatly improved.

[0017] By establishing a clear correspondence between the thickness of the welding test plate and the X-ray beam energy or the X-ray tube voltage U, it is ensured that the X-ray energy, intensity and exposure time can accurately match the zooming needs of test plates of different thicknesses. Avoiding the problems of film blurring and defect missing caused by the mismatch between the zooming parameters and the test plate thickness, ensuring that the cracks and incomplete penetration defects in the test plate can be accurately identified, meeting the standard requirements of non-destructive testing. The clear parameter correspondence provides a standardized operation basis for the detection personnel, reduces the parameter setting deviation caused by human experience difference, especially for novice operation, reduces the training cost. At the same time, without repeated parameter adjustment, the device can quickly match the thickness of the test plate, combined with the test plate fixing function of the device, the preparation time for detecting a single test plate is shortened, and the single multi-zooming design further improves the overall detection efficiency. Through dynamic parameter adjustment, the device can not only meet the rapid detection of conventional thickness test plates, but also adapt to the high-precision detection of super-thick test plates, without the need to replace the equipment to cover a wider range of detection scenarios. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is a front view of the X-ray detection device for super-thick welding test plates.

[0019] Figure 2 is a left view of the X-ray detection device for super-thick welding test plates.

[0020] Figure 3 is a top view of the X-ray detection device for super-thick welding test plates.

[0021] Figure 4 is a three-dimensional schematic view of the X-ray detection device for super-thick welding test plates.

[0022] Fig. 1 is a front view of the X-ray detection device for super-thick welding test plates. DETAILED DESCRIPTION

[0023] The specific embodiments of the present application will be further described with reference to the drawings and examples. The following examples are intended to illustrate the present application and are not intended to limit the scope of the present application.

[0024] It should be understood that the term "comprising" as used in this specification and the appended claims, indicates the presence of the stated features, integers, steps, operations, elements, and / or components but does not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof.

[0025] In order to make the drawings simple, only the parts related to the present application are shown in the drawings, and they do not represent the actual structure of the product. In addition, in order to make the drawings simple and easy to understand, in some drawings, only one of the parts having the same structure or function is shown schematically, or only one of them is marked. In this document, "one" not only means "only one", but also means "more than one" in some cases.

[0026] It should be further understood that the term "and / or" as used in the specification and the appended claims means any combination of one or more of the associated listed items and all possible combinations, and includes these combinations.

[0027] In the embodiments shown in the drawings, the indications of directions, such as up, down, left, right, front, and back, are used to explain the structure and movement of various components of the present application, and are not absolute but relative. These indications are appropriate when the components are in the positions shown in the drawings. If the positions of the components change, the indications of the directions also change accordingly.

[0028] In addition, in the description of the present application, the terms "first", "second", and the like are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the specific embodiments of the present application will be described with reference to the drawings. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained from these drawings without creative labor, and other embodiments can also be obtained.

[0030] As shown in the three views of the device for radiographic testing of super-thick welded test plates in Figures 1-3 and the three-dimensional view of the device in Figure 4, the device of the present application comprises: 1 - a walking wheel, 2 - a main body support structure (21 - a main body support structure load-bearing part, 22 - a main body support structure test plate support fixing part), 3 - a test plate fixing pillar (31 - a test plate fixing pillar reserved hole), 4 - a test plate platform, 5 - a small test plate platform, 6 - a test plate clamping mechanism, and 7 - a detachable support rod.

[0031] Example 1: Testing of a welded test plate with a width of 0.5 meters and a thickness of 150 mm The specific testing process using the above-mentioned device for radiographic testing of super-thick welded test plates is as follows: Move the device to the testing position and lock the walking wheel to prevent movement of the device during testing. Since the test plate has a width of 0.5 meters ≤ 0.6 meters and a thickness of 150 mm ≤ 200 mm, it meets the applicable conditions of the small test plate platform (5), so the small test plate platform (5) is selected. Use hoisting equipment to hoist the test plate onto the small test plate platform (5) and use the adjustable test plate clamping mechanism (6) to fix the test plate. The effective stroke of the adjustable test plate clamping mechanism (6) is 200 mm, which can stably clamp the test plate. Install the detachable support rod (7) to reinforce the device and enhance its stability during testing. Adjust the parameters of the X-ray source to complete the transmission. Since the test plate has a thickness of 150 mm, according to the corresponding relationship between X-ray beam energy and equivalent steel thickness range, select an X-ray beam energy of 1 MeV for transmission. Example 2: Testing of a welded test plate with a width of 1 meter and a thickness of 200 mm Use the above-mentioned radiographic testing device and method, with the following steps: After moving the device to the testing position, lock the walking wheel. The test plate has a width of 1 meter > 0.6 meters, which is not suitable for the small test plate platform (5), so the test plate platform (4) is selected. Since the test plate has a width of 1 meter > 0.9 meters, use the test plate fixing pillar (3) and the corresponding reserved hole (31) on the test plate platform (4) to fix the test plate, and the length of the test plate is not limited. Install the detachable support rod (7) to further reinforce the device. Since the test plate has a thickness of 200 mm, according to the corresponding relationship between X-ray beam energy and equivalent steel thickness range, select an X-ray beam energy of 2 MeV, and after adjusting other parameters of the X-ray source (such as tube current, exposure time, etc.), complete the transmission. Example 3: Testing of a welded test plate with a width of 0.8 meters and a thickness of 250 mm Use the above-mentioned device and method for testing: Move the device to the testing position and lock the walking wheel. The test plate width is 0.8 meters≤0.9 meters, which can be placed on the left side of the test plate platform (4). However, the test plate thickness is 250 mm>200 mm, which cannot be directly fixed by the adjustable test plate clamping mechanism (6), and the test plate is fixed by the test plate fixing support (3). The detachable support rod (7) reinforcement device is installed. The test plate thickness is 250 mm, and according to the corresponding relationship, the X-ray beam energy of 4 MeV is selected, and the tube voltage, tube current, and exposure time parameters are adjusted to complete the penetration. Example 4: Multiple conventional test plate detection using the right side of the test plate platform (4) The operation process is as follows: Move the device to the detection position and lock the walking wheels. Remove the right side of the test plate platform (4), which can be used for single multiple X-ray penetration of conventional welding test plates after removal. Prepare 5 conventional welding test plates with a length of 300 mm, place them in the position after removal of the right side of the test plate platform (4), and fix them by means of the test plate fixing support (3). Install the detachable support rod (7) reinforcement device. Adjust the ray source parameters according to the thickness of each test plate. If the thickness of these test plates is 100 mm, select 1 MeV X-ray beam energy for penetration to complete the detection.

[0032] Example 5: Conventional X-ray machine detection when the test plate thickness is 50 mm and the focal length is 1 m Using the above method of detecting super-thick welding test plates, the conventional X-ray machine is used for detection, and the steps are as follows: Move the device to the detection position and lock the walking wheels. The test plate width is 0.8 meters, and the plate thickness is 50 mm. Select the left side of the test plate platform (4) to fix, fix the test plate by the adjustable test plate clamping mechanism (6), and install the detachable support rod (7) reinforcement. Calculate the tube voltage: given the test plate thickness T=50 mm and the focal length F=1 m, according to the formula U=(5T+85)+6T(F-0.8), substitute to get U=(5×50+85)+6×50×(1-0.8)=(250+85)+300×0.2=335+60=395 kV. If the rated voltage of the conventional X-ray machine is 450 kV and the standard maximum tube voltage is 400 kV, 395 kV does not exceed both, directly use 395 kV tube voltage, adjust the tube current and exposure time to complete the penetration. Example 6: Conventional X-ray machine detection when the test plate thickness is 80 mm and the focal length is 0.9 m Using the above detection method, the specific process is as follows: The mobile device locks the walking wheel, and the test plate has a width of 1.2 meters and a thickness of 80 mm, which is fixed by means of a test plate fixing support (3) of a test plate platform (4), and a detachable supporting rod (7) is installed for reinforcement. The calculation tube voltage is T=80 mm, F=0.9 m, and the formula is U=(5*80+85)+6*80*(0.9-0.8)= (400+85)+480*0.1=485+48=533 kV. The rated voltage of the X-ray machine is 500 kV, the standard maximum tube voltage is 500 kV, and 533 kV exceeds the limit value. At this time, the tube voltage is reduced to 500 kV by means of the distance square inverse ratio law, the original exposure time is t1, the original focal length F1=0.9 m, the exposure amount can be corrected by means of the distance square inverse ratio law, and the tube voltage is reduced by increasing the exposure time.

[0033] Finally, it should be noted that: the above examples are only used to illustrate the technical solutions of the present application and not to limit it, although the present application has been described in detail with reference to the above examples, those skilled in the art should understand that: the specific embodiments of the present application can still be modified or replaced, and any modification or equivalent replacement without departing from the spirit and scope of the present application should be covered within the protection scope of the claims of the present application.

Claims

1. A radiographic apparatus for use in testing of ultra-thick weld coupons, characterized by, It comprises: The bottom walking wheel (1) is provided with a locking mechanism; the main body support structure (2) is fixed above the walking wheel (1), which comprises a load-bearing part (21) and a test plate support fixed part (22); the test plate platform (4) is fixed on the test plate support fixed part (22) of the main body support structure; the small test plate platform (5) is fixed on the test plate support fixed part (22) and located on one side of the test plate platform (4); the adjustable test plate clamping mechanism (6) is fixed on the test plate platform (4) and the small test plate platform (5); and the detachable support rod (7) is fixed on the main body support structure (2) and the test plate platform (4).

2. The apparatus of claim 1, wherein, The length and width of the main body support structure load-bearing part (21) are not less than 1.5 meters; the height of the test plate platform (4) from the ground is 0.3 meters, and the test plate platform (4) is provided with test plate fixing pillars (3) and corresponding reserved holes (31); the height of the small test plate platform (5) from the ground is 0.6 meters, and the width is 0.1 meters.

3. The apparatus of claim 1, wherein, The effective stroke of the adjustable test plate clamping mechanism (6) is 200mm, which can clamp a welding test plate with a thickness of not more than 200mm; the test plate clamping mechanism (6) can be moved and disassembled along the test plate support fixed part (22), which is suitable for different sizes of test plates; the adjustable test plate clamping mechanism (6) can be simply disassembled and flexibly moved on the test plate support fixed part (22).

4. A method for the radiographic testing of ultra-thick weld coupons using the apparatus of any one of claims 1 to 3, characterized in that It comprises: S1, move the device to the detection position and lock the walking wheel; According to the size of the test plate, select the platform, after lifting the test plate, fix it with the clamping mechanism; Install the detachable support rod (7) for reinforcement; Adjust the parameters of the ray source to complete the penetration.

5. The method of claim 4, wherein, The small test plate platform (5) is suitable for welding test plates with a width of ≤0.6 meters and a thickness of ≤200mm; for test plates exceeding the size, the test plate fixing pillars (3) can be used for fixation, and the length of the test plate is not limited.

6. The method of claim 5, wherein, Welding test plates with a width of ≤0.9 meters can be fixed on the left side of the test plate platform (4); test plates with a thickness of ≤200mm can be directly fixed by the adjustable test plate clamping mechanism (6); test plates with a width of >0.9 meters or a thickness of >200mm can be fixed by the test plate fixing pillars (3), and the length of the test plate is not limited.

7. The method of claim 4, wherein, The right side of the test plate platform (4) is a detachable platform that can be used for single X-ray penetration of multiple conventional welding test plates, and can at least simultaneously satisfy the detection of 5 test plates with a length of 300mm.

8. The method of claim 4, wherein, Adjust the parameters of the ray source to complete the penetration, adjust the penetration parameters according to the thickness of the welding test plate, the penetration parameters include tube voltage, tube current and exposure time, and during the adjustment process, the load bearing state of the test plate platform (4) or the small test plate platform (5) can be combined to form a corresponding adaptive relationship between the penetration parameters and the thickness of the test plate.

9. The method of claim 4, wherein, When the X-ray beam energy is 1MeV, the equivalent steel thickness range is 36mm-150mm; When the X-ray beam energy is 2MeV, the equivalent steel thickness range is 151mm-200mm; ​ When the X-ray beam energy is 4 MeV, the equivalent steel thickness ranges from 201 mm to 250 mm; When the X-ray beam energy is 6 MeV, the equivalent steel thickness ranges from 251 mm to 280 mm; When the X-ray beam energy is 9 MeV, the equivalent steel thickness ranges from 281 mm to 380 mm; When the X-ray beam energy is 12 MeV, the equivalent steel thickness ranges from 381 mm to 420 mm; When the X-ray beam energy is 15 MeV, the equivalent steel thickness ranges from 421 mm to 460 mm; Wherein, the equivalent steel thickness is the thickness of the plate converted based on the density of 7.85x10 3 kg / m 3 of steel as the benchmark.

10. The method of claim 4, wherein, When the X-ray machine is used for the ray detection, the X-ray tube voltage U=(5T+85)+6T×(F-0.8), T is the thickness of the test plate, and F is the focal length.

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