Built-in ray detection equipment and detection method for circumferential weld of cylinder

Abstract

The invention relates to nondestructive testing equipment, and particularly discloses built-in radiographic testing equipment and a built-in radiographic testing method for a circumferential weld of a cylinder. The built-in ray detection equipment comprises a rotating bracket and two locking brackets, the locking bracket comprises a mounting seat, an upper locking support leg and a lower locking support leg, and the upper locking support leg and the lower locking support leg are respectively configured to be adjustable along the vertical direction relative to the mounting seat; the rotating bracket is arranged between the two locking brackets and is rotationally and movably connected with the two mounting seats respectively; the rotary support is provided with a detection assembly, the detection assembly comprises a radiation source, and the installation base is further provided with a rotation driving unit used for driving the rotary support to rotate. The built-in ray detection equipment can realize reliable clamping in the cylinder body, can automatically complete the detection operation of the circumferential welding seam, and has the advantages of convenience in operation and reliability in detection.

Description

TECHNICAL FIELD

[0001] The present application relates to a non-destructive testing device, in particular to a built-in ray testing device and testing method for a cylindrical annular weld. BACKGROUND

[0002] The cylindrical part is a common mechanical part, which is widely used in pipeline transportation, pressure vessel and other fields. Whether it is a small diameter seamless forming process or a large diameter plate rolling and welding process, the cylindrical part will inevitably adopt a welding form butt joint, that is, there will basically be an annular butt joint, and the quality of the weld is a key factor to determine the sealing and pressure capacity of the cylindrical part.

[0003] In the field of welding processing, the quality of the weld is detected by using a ray detection form. In the context of cylindrical joint detection, the current mainstream detection method is to place a ray camera inside the cylinder, adjust the height of a locking bracket to a suitable position, and then take a single position picture. Subsequently, the ray camera is rotated or the cylinder is rotated to take a picture of the next position, until 360 degrees are rotated to complete the detection. In the above detection method, the adjustment and rotation operations are completed by manual operation, which is low in efficiency, high in production cost, and has certain radiation damage.

[0004] A crack detector is disclosed in Chinese patent application CN 102788848 A, which includes a probe mechanism installed on the skeleton of the crack detector. Multiple probe mechanisms can be arranged on the pipe crack detector, and each probe mechanism has an independent signal acquisition probe to collect crack data. The entire crack detector has 16 probe mechanisms, which are arranged in two rows in front and back, with 8 in each row, to ensure 100% signal coverage in the circumferential direction.

[0005] The above-mentioned crack detector discloses that 100% signal coverage in the circumferential direction is achieved by arranging multiple probe mechanisms. However, the multiple probe mechanisms inevitably increase the cost of the equipment, which does not conform to the economic principle. SUMMARY

[0006] The technical problem to be solved by the present application is to provide a built-in ray testing device and testing method for a cylindrical annular weld, which can realize reliable clamping in the cylinder and automatically complete the detection operation of the annular weld, and has the advantages of convenient operation and reliable detection.

[0007] To solve the above technical problems, the technical solution provided by the present application is as follows: a built-in ray testing device for a cylindrical annular weld, comprising a rotating bracket and two locking brackets. The locking support comprises a mounting seat, an upper locking leg and a lower locking leg, the upper locking leg is connected with the mounting seat and extends upward, the lower locking leg is connected with the mounting seat and extends downward, the upper locking leg and the lower locking leg are arranged in alignment in the vertical direction, and the upper locking leg and the lower locking leg are respectively configured to be adjustable in the vertical direction relative to the mounting seat; The rotating support is arranged between the two locking supports and is rotatably connected with the two mounting seats respectively, the rotating center of the rotating support coincides with the rotating centers of the two locking supports, and the rotating center line is arranged perpendicularly to the height direction of the locking support; The rotating support is provided with a detection assembly, the detection assembly comprises a ray source, and the irradiation direction of the ray source is arranged away from the rotating center of the rotating support; the mounting seat is further provided with a rotating driving unit for driving the rotating support to rotate.

[0008] The locking support can form a stable support platform inside the cylinder through the upper locking leg and the lower locking leg, reliably fix the installation and rotating movement of the rotating support, and reliably support the detection operation. The ray source is arranged away from the rotating center, which can ensure that the ray accurately and effectively penetrates the cylinder wall weld. The rotating driving unit can realize full-automatic 360° continuous rotating detection without manual intervention, significantly improve the detection efficiency, avoid personnel operation close to the radiation source, and reduce the radiation exposure risk.

[0009] The built-in ray detection equipment can realize reliable clamping inside the cylinder and automatically complete the detection operation of the circumferential weld, has the advantages of convenient operation and reliable detection.

[0010] Preferably, the bottom of the locking support is provided with traveling wheels, which facilitates the rapid axial movement and positioning of the equipment inside the cylinder.

[0011] Preferably, the lower locking leg comprises a main segment and a lifting segment distributed in sequence from top to bottom, the lower end of the main segment is provided with a traveling frame, the traveling frame is provided with two traveling wheels, and the two traveling wheels are oppositely arranged relative to the lifting segment; The lifting segment is configured to be height-adjustable; when the lifting segment is in the highest position, the bottom of the lifting segment is higher than the bottom of the traveling wheel, and when the lifting segment is in the lowest position, the bottom of the lifting segment is lower than the bottom of the traveling wheel.

[0012] When transposition movement is required, the lifting segment is in the highest position, the traveling wheel is in contact with the cylinder, and only traveling is required. After movement to the position, the lifting segment is switched to the lowest position, the lifting segment abuts against and locks the inner wall of the cylinder to realize reliable support.

[0013] The setting of the lifting section can adjust the overall height of the locking support within a certain range while realizing the switching between the walking and locking states. Before being sent into the cylinder, the height of the locking support is slightly lower than the inner diameter of the cylinder to ensure smooth walking in the cylinder. After moving to the detection position, the overall height of the locking support can be increased through the lifting section action to realize the abutment locking with the cylinder.

[0014] As preferred, the detection assembly is further provided with a visual detection unit, and the detection direction of the visual detection unit is consistent with the irradiation direction of the ray source.

[0015] The setting of the visual detection unit can pre-identify the weld position, surface defects or positioning marks before the ray detection, assist in automatic focusing or path correction, and improve the detection accuracy and intelligent level. Meanwhile, it can also support multi-modal data fusion and enhance the defect discrimination ability.

[0016] As preferred, the upper end of the upper locking leg is provided with an upper contact plate, the lower end of the lower locking leg is provided with a lower contact plate, and the upper surface of the upper contact plate and the lower surface of the lower contact plate are both arc-shaped.

[0017] The upper contact plate and the lower contact plate can be closely fitted with the inner wall curve of the cylinder, increase the contact area, prevent local stress concentration, avoid scratching the inner wall of the cylinder, and at the same time can adapt to different curvatures within a certain range, improve the locking stability, and are especially suitable for cylinders with different diameters.

[0018] As preferred, the mounting seat is further provided with two groups of auxiliary support arms, the two groups of support arms extend from the mounting seat to both sides, and the support arms are configured to be adjustable in length.

[0019] The setting of the auxiliary support arm can provide additional support laterally, prevent the equipment from shaking, enhance the rigidity of the whole machine, ensure the stability of the ray source track during rotation, improve the imaging quality, and is especially suitable for large-diameter or thin-walled cylinders.

[0020] As preferred, the rotating support includes a telescopic assembly and two connecting blocks, the telescopic assembly includes two groups of equal-length telescopic links, the two groups of telescopic links are sequentially arranged between the two connecting blocks and are respectively hinged with the two connecting blocks, and the two groups of telescopic links are hinged with each other, and the detection assembly is arranged at the hinge of the two groups of telescopic links. The connecting blocks correspond to the locking supports one by one, and the rotating support is connected with the corresponding locking supports through the connecting blocks.

[0021] By adjusting the included angle between the two groups of telescopic links, the distance of the detection assembly relative to the center of the rotating support can be adjusted, and then the extension distance of the ray source is dynamically adjusted, and the detection radius is fine-tuned to adapt to the fitting detection needs of workpieces with different curvatures.

[0022] As preferred, the rotating support further comprises a balancing assembly, the balancing assembly comprising two sets of balancing links of equal length, the two sets of the telescopic links being arranged between two connecting blocks and being hingedly connected with the two connecting blocks respectively, the two sets of the balancing links being hingedly connected and being connected with a counterweight at the hinge of the two sets of the balancing links.

[0023] The balancing assembly composed of the balancing links and the counterweight offsets the eccentric gravity moment of the detection assembly such as the radiation source, significantly reduces the driving load, improves the rotation stability and reduces the rotation driving resistance.

[0024] As preferred, the rotating support further comprises a telescopic adjusting assembly, the telescopic adjusting assembly being arranged between the two sets of the telescopic links or between the two sets of the balancing links, the adjusting assembly being used to adjust the included angle between the two sets of the telescopic links.

[0025] The arrangement of the telescopic adjusting assembly can actively adjust the included angle of the telescopic links and realize the locking of the angle, ensuring the reliability and convenience of the adjustment of the counterweight position or the extension distance of the radiation source. A detection method for the annular weld of a cylinder, using the built-in radiation detection device as described above; comprising the following steps: S1. Installation: arranging the imaging unit along the annular weld on the outside of the cylinder; Meanwhile, the built-in radiation detection device is sent into the cylinder, the position of the built-in radiation detection device is adjusted so that the radiation source is aligned with the annular weld in the axial direction, and the height of the locking support is adjusted so that the upper locking leg and the lower locking leg abut against the inside of the cylinder and are locked; S2. Detection: the radiation source works to send radiation to the annular weld, and the rotating driving assembly works to drive the rotating support to rotate one round; the imaging unit receives the radiation penetrating the weld and generates the circumferential image of the weld, completing the detection. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 It is a structure schematic view of the built-in radiation detection device for the annular weld of a cylinder in this embodiment, wherein the radiation source is arranged upward; Figure 2 It is a front view of the built-in radiation detection device for the annular weld of a cylinder in this embodiment; Figure 3 It is a structure schematic view of the built-in radiation detection device for the annular weld of a cylinder in this embodiment, wherein the radiation source is arranged forward; Figure 4 It is a structure schematic view of the built-in radiation detection device for the annular weld of a cylinder in this embodiment, wherein the radiation source is arranged forward; Figure 5The structure diagram of the built-in radiographic detection equipment for the cylindrical annular weld of the embodiment is located inside the cylinder, and the radiation source is arranged upward; Figure 6 The structure diagram of the built-in radiographic detection equipment for the cylindrical annular weld of the embodiment is located inside the cylinder, and the radiation source is arranged forward; Figure 7 The structure diagram of the locking support in the built-in radiographic detection equipment for the cylindrical annular weld of the embodiment; Figure 8 The partial structure diagram of the lower end of the locking support in the built-in radiographic detection equipment for the cylindrical annular weld of the embodiment, wherein the lifting section is in the highest position; Figure 9 The partial structure diagram of the lower end of the locking support in the built-in radiographic detection equipment for the cylindrical annular weld of the embodiment, wherein the lifting section is in the lowest position; Figure 10 The structure diagram of the locking support in the built-in radiographic detection equipment for the cylindrical annular weld of the embodiment, which includes an auxiliary support arm. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical scheme and advantages of the present application clearer, the present application is further described in detail below in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and do not limit the present application. EMBODIMENT

[0028] As shown in Figures 1-3 , a built-in radiographic detection equipment for a cylindrical annular weld includes a rotating support 2 and two locking supports 1.

[0029] As shown in Figure 1 and Figure 7 , the locking support 1 includes a mounting seat 12, an upper locking leg 11 and a lower locking leg 13. The upper locking leg 11 is connected with the mounting seat 12 and extends upward, and the lower locking leg 13 is connected with the mounting seat 12 and extends downward. The upper locking leg 11 and the lower locking leg 13 are arranged in vertical alignment, and the upper locking leg 11 and the lower locking leg 13 are respectively configured to be adjustable in the vertical direction relative to the mounting seat 12.

[0030] As shown in Figures 1-3As shown, the rotating bracket 2 is arranged between the two locking brackets 1 and is rotatably connected with the two mounting seats 12 respectively, the rotating center of the rotating bracket 2 coincides with the rotating center of the two locking brackets 1, and the rotating center line is arranged vertically to the height direction of the locking bracket 1. The mounting seat 12 is also provided with a rotating driving unit for driving the rotating bracket 2 to rotate, and specifically, the rotating driving unit comprises a motor.

[0031] As shown in the Figures 4-6 locking bracket 1 can form a stable support platform inside the cylinder 7 through the upper locking leg 11 and the lower locking leg 13, which provides reliable installation and rotation for the installation and rotation of the rotating bracket 2, and provides reliable support for detection operation.

[0032] Specifically, as shown in the Figures 7-9 the bottom of the locking bracket 1 is provided with a walking wheel 15, which facilitates the rapid axial movement and positioning of the equipment in the cylinder.

[0033] Specifically, as shown in the Figure 7 the upper end of the upper locking leg 11 is provided with an upper contact plate 16, and the lower end of the lower locking leg 13 is provided with a lower contact plate 14, and the upper surface of the upper contact plate 16 and the lower surface of the lower contact plate 14 are both arc-shaped. As shown in Figure 5 and Figure 6 the upper contact plate 16 and the lower contact plate 14 can be closely attached to the inner wall curve of the cylinder 7, increasing the contact area, preventing local stress concentration, avoiding scratching the inner wall of the cylinder 7, and at the same time can adapt to different curvatures within a certain range, improving the locking stability, especially suitable for different diameter cylinders 7.

[0034] As shown in the Figures 1-3 the rotating bracket 2 is provided with a detection assembly 3, the detection assembly 3 comprises a ray source 31, and the irradiation direction of the ray source 31 is arranged away from the rotating center of the rotating bracket 2. The ray source 31 is arranged away from the rotating center, which can ensure that the ray accurately and effectively penetrates the cylinder wall weld. The setting of the rotating driving unit can realize full-automatic 360° continuous rotation detection without manual intervention, significantly improving the detection efficiency, avoiding personnel close to the radiation source operation, and reducing the risk of radiation exposure.

[0035] Specifically, the detection assembly 3 is also provided with a visual detection unit, and the detection direction of the visual detection unit is consistent with the irradiation direction of the ray source 31. The setting of the visual detection unit can pre-identify the weld position, surface defect or positioning mark before the ray detection, assist automatic focusing or path correction, and improve the detection accuracy and intelligent level. At the same time, it can also support multi-modal data fusion and enhance the defect discrimination ability.

[0036] Specifically, as shown in the Figures 1-3As shown, the rotating support 2 includes a telescopic assembly and two connecting blocks 23. The telescopic assembly includes two sets of telescopic connecting rods 21 of equal length. The two sets of telescopic connecting rods 21 are sequentially arranged between the two connecting blocks 23 and are hinged to the two connecting blocks 23 respectively. The detection assembly 3 is located at the hinge point of the two sets of telescopic connecting rods 21. The connecting blocks 23 correspond one-to-one with the locking brackets 1, and the rotating support 2 is connected to the corresponding locking brackets 1 through the connecting blocks 23. Specifically, each set of telescopic connecting rods 21 is arranged in parallel, and can be equivalent to a single connecting rod during motion analysis.

[0037] By adjusting the included angle between the two sets of telescopic connecting rods 21, the distance of the detection component 3 relative to the center of the rotating frame can be adjusted, thereby dynamically adjusting the extension distance of the X-ray source 31 and fine-tuning the detection radius to adapt to the fitting detection requirements of workpieces with different curvatures.

[0038] Furthermore, such as Figures 1-3 As shown, the rotating support 2 also includes a balancing assembly, which comprises two sets of equal-length balancing rods 22. The two sets of telescopic rods 21 are sequentially arranged between two connecting blocks 23 and hinged to the two connecting blocks 23 respectively. A counterweight 5 is connected to the hinge of the two sets of balancing rods 22. The balancing assembly, consisting of the balancing rods 22 and the counterweight 5, counteracts the eccentric gravitational torque of the detection components 3, such as the X-ray source 31, significantly reducing the driving load, improving rotational stability, and reducing rotational driving resistance. Specifically, each set of balancing rods 22 is arranged in parallel and can be considered equivalent to a single rod during motion analysis.

[0039] Specifically, such as Figures 1-3 As shown, the length of the balance link 22 is no greater than the length of the telescopic link 21. This ensures that the movement trajectory of the counterweight 5 is reasonable, avoids interference, and optimizes the torque balance effect.

[0040] Specifically, such as Figures 1-3 As shown, the rotating support 2 also includes a telescopic adjustment component 4, which is disposed between two sets of telescopic connecting rods 21 or between two sets of balance connecting rods 22. The adjustment component is used to adjust the included angle between the two sets of telescopic connecting rods 21. The telescopic adjustment component 4 can actively adjust the included angle of the telescopic connecting rods 21 and lock the angle, ensuring the reliability and convenience of adjusting the counterweight position or the extension distance of the radiation source 31.

[0041] Furthermore, such as Figure 8 and Figure 9As shown, the lower locking outrigger 13 includes a main section 131 and a lifting section 132 distributed sequentially from top to bottom. A traveling frame 17 is provided at the lower end of the main section 131, and two traveling wheels 15 are provided on the traveling frame 17, positioned opposite each other to the lifting section 132. The lifting section 132 is height-adjustable. When the lifting section 132 is in its highest position, the bottom of the lifting section 132 is higher than the bottom of the traveling wheels 15; when the lifting section 132 is in its lowest position, the bottom of the lifting section 132 is lower than the bottom of the traveling wheels 15.

[0042] Specifically, such as Figure 8 and Figure 9 As shown, the lifting section 132 includes a pneumatic cylinder, hydraulic cylinder, or electric cylinder, which switches between the lowest and highest positions by extending and retracting the lifting section 132. The upper end of the lifting section 132 abuts against the main section 131, and the upper end is connected to the traveling frame 17 through a reset elastic element 18. When the lifting section 132 is shortened, the reset elastic element 18 drives the lower end of the lifting section 132 to rise, while the upper end always abuts against the main section 131.

[0043] When rotation or movement is required, the lifting section 132 is in its highest position, and the traveling wheels 15 are in contact with the cylinder, allowing for movement. After the movement is completed, the lifting section 132 switches to its lowest position, and the lifting section 132 abuts and locks against the inner wall of the cylinder, achieving reliable support.

[0044] The lifting segment 132, while enabling the switching between walking and locking states, also allows for adjustment of the overall height of the locking bracket 1 within a certain range. Before being inserted into the cylinder, the height of the locking bracket 1 is adjusted to be slightly lower than the inner diameter of the cylinder, based on the inner diameter of the cylinder, to ensure smooth movement within the cylinder. After moving to the detection position, the lifting segment 132 action increases the overall height of the locking bracket 1, achieving contact and locking with the cylinder.

[0045] Furthermore, such as Figure 10 As shown, the mounting base 12 is also provided with two sets of auxiliary support arms 19. The two sets of support arms extend from the mounting base 12 to both sides, and the support arms are configured to be adjustable in length. The auxiliary support arms 19 can provide additional support in the lateral direction, prevent the equipment from shaking, enhance the rigidity of the whole machine, ensure the stability of the trajectory of the X-ray source 31 during rotation, and improve the imaging quality. They are particularly suitable for large-diameter or thin-walled cylinders.

[0046] The built-in radiographic inspection device of this application can reliably clamp inside the cylinder and automatically complete the inspection operation of the circumferential weld, which has the advantages of convenient operation and reliable inspection. A method for inspecting circumferential welds in cylindrical bodies, employing the built-in radiographic inspection equipment described above; Includes the following steps: S1. Installation: The imaging unit is arranged along the circumferential weld on the outside of the cylinder; Simultaneously, the built-in X-ray inspection device is inserted into the cylinder, and its position is adjusted so that the X-ray source 31 is aligned axially with the circumferential weld. The position of the built-in X-ray inspection device is adjusted, with the visual inspection unit assisting in positioning.

[0047] The lifting assembly operates, adjusting the height of the locking bracket 1 so that the upper locking leg 11 and the lower locking leg 13 abut against the inside of the cylinder and achieve locking.

[0048] The auxiliary support arm 19 extends to both sides to assist in positioning.

[0049] S2. Inspection: The X-ray source 31 operates to send X-rays towards the circumferential weld, and the rotation drive assembly operates to drive the rotating bracket 2 to rotate one revolution. The imaging unit receives the X-rays that penetrate the weld and generates a circumferential image of the weld, completing the inspection.

[0050] In summary, the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A built-in radiographic inspection device for circumferential welds of cylindrical bodies, characterized in that: Includes a rotating bracket and two locking brackets; The locking bracket includes a mounting base, an upper locking leg, and a lower locking leg. The upper locking leg is connected to the mounting base and extends upward, and the lower locking leg is connected to the mounting base and extends downward. The upper and lower locking legs are aligned vertically and are configured to be adjustable vertically relative to the mounting base. The rotating bracket is disposed between the two locking brackets and is rotatably connected to the two mounting bases respectively. The rotation center of the rotating bracket coincides with that of the two locking brackets, and the rotation center line is set perpendicular to the height direction of the locking brackets. The rotating bracket is equipped with a detection component, which includes an X-ray source. The X-ray source is positioned away from the rotation center of the rotating bracket. The mounting base is also equipped with a rotation drive unit for driving the rotating bracket to rotate.

2. The built-in X-ray inspection device according to claim 1, characterized in that: The locking bracket is equipped with wheels at its bottom.

3. The built-in X-ray detection device according to claim 3, characterized in that: The lower locking outrigger includes a main section and a lifting section distributed from top to bottom. The lower end of the main section is provided with a traveling frame, and the traveling frame is provided with two traveling wheels, which are positioned opposite each other to the left and right of the lifting section. The lifting section is configured to be height adjustable; when the lifting section is at its highest position, the bottom of the lifting section is higher than the bottom of the walking wheel, and when the lifting section is at its lowest position, the bottom of the lifting section is lower than the bottom of the walking wheel.

4. The built-in X-ray inspection device according to claim 1, characterized in that: The detection component is further provided with a visual detection unit, the detection direction of which is consistent with the irradiation direction of the X-ray source.

5. The built-in X-ray inspection device according to claim 1, characterized in that: The upper locking leg has an upper contact plate at its upper end, and the lower locking leg has a lower contact plate at its lower end. Both the upper surface of the upper contact plate and the lower surface of the lower contact plate are arc-shaped.

6. The built-in X-ray inspection device according to claim 1, characterized in that: The mounting base is also provided with two sets of auxiliary support arms, which extend from the mounting base to both sides, and the support arms are configured to be adjustable in length.

7. The built-in X-ray inspection device according to any one of claims 1-6, characterized in that: The rotating bracket includes a telescopic assembly and two connecting blocks. The telescopic assembly includes two sets of telescopic connecting rods of equal length. The two sets of telescopic connecting rods are sequentially arranged between the two connecting blocks and are hinged to the two connecting blocks respectively. The two sets of telescopic connecting rods are hinged together. The detection assembly is located at the hinge of the two sets of telescopic connecting rods. The connecting blocks correspond one-to-one with the locking brackets, and the rotating brackets are connected to the corresponding locking brackets through the connecting blocks.

8. The built-in X-ray inspection device according to claim 7, characterized in that: The rotating support also includes a balancing component, which includes two sets of equal-length balancing rods. The two sets of telescopic rods are sequentially arranged between two connecting blocks and are hinged to the two connecting blocks respectively. The two sets of balancing rods are hinged together, and a counterweight is connected at the hinge point of the two sets of balancing rods.

9. The built-in X-ray inspection device according to claim 8, characterized in that: The rotating support also includes a telescopic adjustment component, which is disposed between two sets of telescopic connecting rods or between two sets of balance connecting rods. The adjustment component is used to adjust the included angle between the two sets of telescopic connecting rods.

10. A method for inspecting circumferential welds on cylindrical bodies, characterized in that: The built-in X-ray inspection device as described in any one of claims 1-9 is adopted; Includes the following steps: S1. Installation: The imaging unit is arranged along the circumferential weld on the outside of the cylinder; At the same time, the built-in X-ray inspection device is inserted into the cylinder, and the position of the built-in X-ray inspection device is adjusted so that the X-ray source is aligned with the circumferential weld in the axial direction; the height of the locking bracket is adjusted so that the upper locking leg and the lower locking leg abut against the inside of the cylinder and achieve locking. S2. Inspection: The X-ray source sends X-rays to the circumferential weld, and the rotation drive assembly drives the rotating bracket to rotate one revolution; the imaging unit receives the X-rays that penetrate the weld and generates a circumferential image of the weld, thus completing the inspection.

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