A detection device suitable for butt welds of forged welded heads

Abstract

The present invention relates to the technical field of butt weld detection of forged welded container heads, and specifically to a detection device suitable for butt welds of forged welded container heads, comprising a crossbar, two first scanning assemblies being arranged on one side wall of the crossbar with the weld as the center, a second scanning assembly being arranged on the same side wall of the crossbar with the weld as the center, a third scanning assembly being arranged on the other side wall of the crossbar with the weld as the center, and a fourth scanning assembly being arranged on the other side wall of the crossbar with the weld as the center. The present invention completes TOFD detection of welds of unequal thickness on butt welds of forged welded container heads without requiring the forged welded container to be placed in a flaw detection room, thereby reducing detection costs, thereby improving the universality of the device, and in a single detection process, by changing the probe spacing, the number of scanning assemblies on the same crossbar can be increased, thereby increasing the number of simultaneous detections in a single time as required, thereby improving the efficiency of a single detection compared to radiographic detection.

Description

Technical Field

[0001] The invention relates to the technical field of butt weld detection of forged-welded container heads, and in particular to a detection device suitable for butt weld detection of forged-welded container heads. Background Art

[0002] TOFD (Time of Flight Diffraction) detection technology is one of the latest ultrasonic testing technologies. Its main feature is the use of ultrasonic diffraction and reflection signals to achieve the purpose of detection. The quantification of defects not only depends on the amplitude of the signal, but also has a relatively high detection sensitivity. At the same time, this technology combines advanced data processing and image processing technologies, which can achieve real-time imaging, making defect analysis clear and intuitive, and the detection data is accurate, reliable and can be recorded in real time. At the same time, after expanding the application scenarios, it also has some advantages of radiographic inspection. Therefore, it is widely used in West-East Gas Pipeline, offshore pipe laying, hydropower station construction, heavy-duty containers and in-service inspections of nuclear power plants. In particular, the superiority and reliability of this technology are concentratedly reflected in the inspection of welds in large thick-walled containers.

[0003] For forged and welded containers, the thickness of the butt-end weld is generally around 200-230mm. During the manufacturing process, the inspection of the butt-end weld needs to be carried out in a high-energy flaw detection room for radiographic inspection. However, radiographic inspection requires the workpiece to be transferred to the high-energy flaw detection room for inspection, which has low inspection efficiency and high cost. In addition, since this type of weld is extremely special, the center of the weld is about 1.5m offset to the side of the end port and perpendicular to the ground. The cross-section of the entire weld is arc-shaped, and the lower end head is often provided with a dovetail groove on one side of the weld due to design requirements. As a result, the distance between the weld and the edge of the dovetail groove is small, making radiographic inspection difficult and error-prone. The above factors will affect the radiographic inspection of this type of weld. Under the premise of increasing the overall inspection time, some additional inspection errors may be added.

[0004] Therefore, it is necessary to invent a detection device suitable for the butt weld of forged and welded heads to solve the above problems. Summary of the Invention

[0005] In order to address the deficiencies of the prior art, the purpose of the present invention is to provide a detection device suitable for butt welds of forged and welded heads, which solves the problem in the prior art that radiographic detection requires the workpiece to be transferred to a high-energy flaw detection room for testing, resulting in low detection efficiency and high cost. In addition, since this type of weld is extremely special, the center of the weld is the center of the circle, which is offset by about 1.5m to one side of the head port and is perpendicular to the ground. The cross-section of the entire weld is arc-shaped, and the lower head is often provided with a dovetail groove on one side of the weld due to design requirements. As a result, the distance between the weld and the edge of the dovetail groove is small, making radiographic detection difficult and error-prone. The above factors will affect the radiographic detection of this type of weld, and under the premise of increasing the overall detection time, some additional detection errors may be added.

[0006] In order to achieve the above objectives, the present invention adopts the following technical solutions:

[0007] A detection device for a butt weld of a forged and welded head, comprising a cross bar that can move along the butt weld of the forged and welded head, wherein one side wall of the cross bar is provided with two first scanning assemblies that can slide synchronously toward or away from the weld with the weld as the center, and two second scanning assemblies that can slide synchronously toward or away from the weld with the weld as the center on the same side wall of the cross bar are provided with two second scanning assemblies that can slide synchronously toward or away from the weld with the weld as the center, and the spacing between the two second scanning assemblies is greater than the spacing between the two first scanning assemblies, and two third scanning assemblies that can slide synchronously toward or away from the weld with the weld as the center on the other side wall of the cross bar are provided with two third scanning assemblies that can slide synchronously toward or away from the weld with the weld as the center, and the spacing between the two third scanning assemblies is greater than the spacing between the two second scanning assemblies, and two fourth scanning assemblies that can slide synchronously toward or away from the weld with the weld as the center on the other side wall of the cross bar are further provided with two fourth scanning assemblies that can slide synchronously toward or away from the weld with the weld as the center, and the spacing between the two fourth scanning assemblies is greater than the spacing between the two third scanning assemblies;

[0008] When the distance between the weld center and the dovetail groove is smaller than the single-sided distance between one of the first scanning components and the weld center, the detection distance between the two first scanning components 1 is ensured to remain unchanged, and the symmetrical sliding centers of the second scanning component, the third scanning component and the fourth scanning component are offset toward one side of the head.

[0009] As a preferred embodiment of the present invention, the first scanning assembly includes a slider slidably mounted on a side wall of the crossbar and capable of being locked in position, a probe loading arm rotatably mounted on a side wall of the slider, and a probe rotatably mounted within the probe loading arm via a plurality of positioning pins, the positioning pins limiting the rotational angle of the probe within the probe loading arm. The structures of the second, third, and fourth scanning assemblies are identical to those of the first scanning assembly. As a preferred embodiment of the present invention, an encoder capable of recording scanning data and travel distance is detachably mounted on a side wall of the crossbar.

[0010] As a preferred solution of the present invention, a water separator is installed on a portion of one side wall of the cross bar located between the third scanning assembly and the encoder.

[0011] As a preferred solution of the present invention, a plug is detachably installed at one end of the cross bar, and a walking handle is detachably installed at the other end of the cross bar. The side wall of the walking handle is equipped with two first magnetic wheels that can be adsorbed on the surface of the workpiece and roll along the surface.

[0012] As a preferred solution of the present invention, a portion of one side wall of the crossbar located between the third scanning assembly and the water divider is equipped with a second magnetic wheel that can be adsorbed on the surface of the workpiece and can roll along the surface.

[0013] As a preferred solution of the present invention, the top end of the crossbar is slidably connected to a scanning handle.

[0014] As a preferred solution of the present invention, each of the probes includes a wedge block, a water injection hole is opened in the wedge block, and the multiple water injection holes are connected to the water distributor through a hose.

[0015] In the above technical solution, the technical effects and advantages provided by the present invention are:

[0016] For some forged and welded container head butt welds with non-uniform thickness and a dovetail groove on one side, due to the chamfered edge or design structure of the dovetail groove on one side, the distance between the weld center and the dovetail groove may be smaller than the single-sided distance between the second scanning component, the third scanning component or the fourth scanning component and the weld center. As a result, the probe sound beam under the conventional arrangement in this case will not be focused on 2 / 3 of the detection depth range, resulting in a reduced defect detection rate or missed detection. At this time, by ensuring that the detection distance between the two first scanning components remains unchanged, and at the same time, by making the symmetrical sliding center of the second scanning component, the third scanning component and the fourth scanning component offset to one side of the head, the second scanning component, the third scanning component and the fourth scanning component are finally aligned with the weld center. The single-side spacing of the center is smaller than the spacing between the weld center and the dovetail groove. Then, the first scanning component, the second scanning component, the third scanning component and the fourth scanning component are used to complete the synchronous TOFD inspection at different thicknesses. That is, for some non-uniform thickness forged welded container head butt welds, the probe offset method can be used to detect defects in the weld. On the one hand, it avoids the problems of high detection difficulty and large error caused by the existence of the dovetail groove during the radiographic inspection process. On the other hand, in a single inspection process, fast TOFD inspection at four layers of different thicknesses can be completed separately, realizing rapid inspection. Compared with the traditional radiographic inspection process that requires multiple completions of flaw detection at different thicknesses, the inspection efficiency is also significantly improved.

[0017] 2. This application completes TOFD inspection of welds of unequal thickness on the butt welds of forged and welded container heads without placing the forged and welded container in a flaw detection room, thereby reducing the inspection cost, thereby improving the universality of the device, and in a single inspection process, the number of components scanned on the same crossbar can be increased by changing the probe spacing, thereby increasing the number of simultaneous inspections in a single time as required, thereby improving the efficiency of a single inspection compared to X-ray inspection, and some errors in the X-ray inspection process can be avoided by means of probe bias, thereby avoiding inspection errors while improving the overall inspection efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention when it is not biased;

[0019] Figure 2 For the present invention Figure 1 Schematic diagram of the planar top view structure;

[0020] Figure 3 This is a schematic diagram of the overall structure of the present invention after biasing;

[0021] Figure 4 For the present invention Figure 3 Schematic diagram of the planar top view structure;

[0022] Figure 5 This is a schematic diagram of the overall structure of the present invention after the upper head side is offset at the weld;

[0023] Figure 6 It is a schematic diagram of the overall structure of the present invention after the lower head side is offset at the weld.

[0024] Description of reference numerals:

[0025] 1. First scanning assembly; 2. Second scanning assembly; 3. Third scanning assembly; 4. Fourth scanning assembly; 5. Travel handle; 6. First magnetic wheel; 7. Scanning handle; 8. Second magnetic wheel; 9. Encoder; 10. Water distributor; 11. Crossbar; 12. Positioning pin; 13. Water injection hole; 14. Plug; 15. Slider; 16. Probe loading arm; 17. Probe. DETAILED DESCRIPTION

[0026] The present invention will be further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present invention and are not intended to limit the scope of protection of the present invention.

[0027] The present invention provides Figure 1-6The device shown is suitable for detecting the butt weld of a forged welded head, comprising a cross bar 11 that can move along the butt weld of the forged welded head, and one side wall of the cross bar 11 is provided with two first scanning components 1 that can slide synchronously toward or away from the weld with the weld as the center, and two second scanning components 2 that can slide synchronously toward or away from the weld with the weld as the center on the same side wall of the cross bar 11, and the two second scanning components 2 are provided with a larger spacing than the spacing between the two first scanning components 1, and two third scanning components 3 that can slide synchronously toward or away from the weld with the weld as the center on the other side wall of the cross bar 11, and the two third scanning components 3 are provided with a larger spacing than the spacing between the two second scanning components 2, and the other side wall of the cross bar 11 is also provided with the weld as the center Two fourth scanning assemblies 4 are provided which can slide synchronously toward or away from the weld, and the spacing between the two fourth scanning assemblies 4 is greater than the spacing between the two third scanning assemblies 3. For welds of equal thickness, the detection surface outside the weld is horizontal, and the sound beam of each set of probes 17 can be focused at 2 / 3 of the detection depth range, meeting the detection requirements while having a high defect detection rate. However, for welds of unequal thickness, parts of the detection device cannot be symmetrically distributed on both sides of the weld center line. Therefore, it is necessary to install the second scanning assembly 2, the third scanning assembly 3 and the fourth scanning assembly 4 with larger spacing in an offset manner, so that the single-side spacing between the weld centers of the second scanning assembly 2, the third scanning assembly 3 and the fourth scanning assembly 4 is less than the spacing between the weld center and the dovetail groove;

[0028] When the distance between the weld center and the dovetail groove is smaller than the single-sided distance between one of the fourth scanning components 4 and the weld center, the symmetrical sliding centers of the second scanning component 2, the third scanning component 3 and the fourth scanning component 4 are offset toward one side of the head.

[0029] The first scanning assembly 1 includes a slider 15 that is slidably mounted on the side wall of the crossbar 11 and can be locked in the sliding position, a probe loading arm 16 that is rotatably mounted on the side wall of the slider 15, and a probe 17 that is rotatably mounted in the probe loading arm 16 via multiple positioning pins 12. The positioning pins 12 can limit the rotation angle of the probe 17 in the probe loading arm 16. The structures of the second scanning assembly 2, the third scanning assembly 3, and the fourth scanning assembly 4 are the same as those of the first scanning assembly 1. The spacing of each set of probe loading arms 16 on the crossbar 11 can be freely adjusted according to the thickness of the weld, making it easy to select a suitable spacing for the probes 17. The fixing method is to fix them to the crossbar 11 with nuts to meet TOFD inspection requirements.

[0030] An encoder 9 that can record scanning data and travel distance is detachably installed on one side wall of the cross bar 11. When the cross bar 11 moves along the weld, the encoder 9 can record the recorded data of the first scanning component 1, the second scanning component 2, the third scanning component 3 and the fourth scanning component 4 at any time, and record the travel distance of the first magnetic wheel 6 and the second magnetic wheel 8.

[0031] A water divider 10 is installed on the part of one side wall of the cross bar 11 located between the third scanning component 3 and the encoder 9. The water divider 10 and the water injection hole 13 are connected with a φ3 hose to transport water. The purpose of transporting water is to couple the water during detection to play a detection coupling role. The water divider 10 can realize the automatic water supply function by connecting to the pressure pot or water pump through the hose.

[0032] A plug 14 is detachably mounted on one end of the cross bar 11, and a walking handle 5 is detachably mounted on the other end of the cross bar 11. Two first magnetic wheels 6 are mounted on the side wall of the walking handle 5, which can be adsorbed on the surface of the workpiece and roll along the surface. The plug 14 can prevent the slider 15 on the side wall of the cross bar 11 from falling off.

[0033] A second magnetic wheel 8 is installed on the side wall of the cross bar 11 between the third scanning assembly 3 and the water separator 10, which can be adsorbed on the surface of the workpiece and roll along the surface. The second magnetic wheel 8 adopts a single wheel setting to avoid blocking the probe 17 and the probe loading arm 16.

[0034] The top of the crossbar 11 is slidably connected to a scanning handle 7. During the scanning process, the scanning handle 7 can be held to apply force to the entire device, thereby driving the entire device to move along the weld for inspection.

[0035] Each probe 17 includes a wedge block, in which a water injection hole 13 is opened. The multiple water injection holes 13 are connected to the water distributor 10 through a hose.

[0036] For some forged and welded container head butt welds with non-uniform thickness and dovetail grooves on one side, a dovetail groove may appear on one side due to edge chamfering, resulting in the distance between the weld center and the dovetail groove being smaller than the single-side distance between the second scanning component 2, the third scanning component 3 or the fourth scanning component 4 and the weld center. As a result, the sound beam of the probe 17 under the conventional arrangement in this case will not be focused on 2 / 3 of the detection depth range, resulting in a reduced defect detection rate or missed detection. At this time, by ensuring that the detection distance between the two first scanning components 1 remains unchanged and at the same time by making the second scanning component 4 The symmetrical sliding centers of the components 2, 3 and 4 are offset to one side of the head, so that the single-side distance between the second scanning component 2, 3 and 4 and the weld center is smaller than the distance between the weld center and the dovetail groove. Then, the first scanning component 1, 2, 3 and 4 scanning components are used to complete the synchronous TOFD detection at different layer thicknesses. That is, for some non-uniform thickness forged welded container head butt welds, the probe 17 offset method can be used to detect The defects in the weld, on the one hand, avoid the problem of large ray offset due to the presence of the dovetail groove during the radiographic inspection process, that is, avoid the detection error caused by the large offset, on the other hand, in a single inspection process, four layers of different thicknesses can be completed separately at fast TOFD inspection, thereby achieving fast inspection, which also significantly improves the inspection efficiency compared to the traditional radiographic inspection process that requires multiple completions of flaw detection at different thicknesses; the present application completes TOFD inspection of medium and unequal thickness welds in the butt weld of the forged welded container head without the need to place the forged welded container in the flaw detection room, thereby reducing the inspection cost, thereby improving the universality of the device, and in a single inspection process, by changing the spacing of the probes 17, the number of scanning components on the same crossbar 11 can be increased, thereby increasing the number of simultaneous inspections in a single time as required, thereby improving the efficiency of a single inspection compared to radiographic inspection, and some errors in the radiographic inspection process can be avoided by offsetting the probe 17, thereby avoiding inspection errors while improving the overall inspection efficiency.

[0037] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A device for detecting butt welds of forged and welded heads, characterized by: The invention comprises a cross bar (11) that can move along the butt weld of the forged welded head, wherein one side wall of the cross bar (11) is provided with two first scanning assemblies (1) that can slide synchronously toward or away from the weld, with the weld as the center, and the same side wall of the cross bar (11) is provided with two second scanning assemblies (2) that can slide synchronously toward or away from the weld, with the weld as the center, and the spacing between the two second scanning assemblies (2) is greater than the spacing between the two first scanning assemblies (1), and the other side wall of the cross bar (11) is provided with two third scanning assemblies (3) that can slide synchronously toward or away from the weld, and the spacing between the two third scanning assemblies (3) is greater than the spacing between the two second scanning assemblies (2), and the other side wall of the cross bar (11) is further provided with two fourth scanning assemblies (4) that can slide synchronously toward or away from the weld, with the weld as the center, and the spacing between the two fourth scanning assemblies (4) is greater than the spacing between the two third scanning assemblies (3); When the distance between the center of the weld and the dovetail groove is smaller than the single-sided distance between one of the fourth scanning components (4) and the center of the weld, the detection distance between the two first scanning components 1 is ensured to remain unchanged, and the symmetrical sliding centers of the second scanning component (2), the third scanning component (3) and the fourth scanning component (4) are offset toward one side of the head.

2. A detection device for butt welds of forged and welded heads according to claim 1, characterized in that: The first scanning assembly (1) includes a slider (15) slidably mounted on a side wall of a crossbar (11) and capable of locking a sliding position, a probe loading arm (16) rotatably mounted on a side wall of the slider (15), and a probe (17) rotatably mounted in the probe loading arm (16) via a plurality of positioning pins (12), wherein the positioning pins (12) can limit the rotation angle of the probe (17) in the probe loading arm (16). The structures of the second scanning assembly (2), the third scanning assembly (3) and the fourth scanning assembly (4) are the same as those of the first scanning assembly (1).

3. The device for detecting butt welds of forged and welded heads according to claim 2, characterized in that: An encoder (9) capable of recording scanning data and travel distance is detachably mounted on one side wall of the crossbar (11).

4. The device for detecting butt welds of forged and welded heads according to claim 3, characterized in that: A water separator (10) is installed on a portion of a side wall of the crossbar (11) located between the third scanning assembly (3) and the encoder (9).

5. The device for detecting butt welds of forged and welded heads according to claim 1, characterized in that: A plug (14) is detachably mounted on one end of the crossbar (11), and a walking handle (5) is detachably mounted on the other end of the crossbar (11). The side wall of the walking handle (5) is mounted with two first magnetic wheels (6) that can be adsorbed on the surface of a workpiece and can roll along the surface.

6. The device for detecting butt welds of forged and welded heads according to claim 4, characterized in that: A second magnetic wheel (8) capable of adsorbing on and rolling along the surface of a workpiece is installed on a portion of a side wall of the crossbar (11) located between the third scanning assembly (3) and the water separator (10).

7. The device for detecting butt welds of forged and welded heads according to claim 1, characterized in that: The top end of the crossbar (11) is slidably connected to a scanning handle (7).

8. The device for detecting butt welds of forged and welded heads according to claim 4, characterized in that: Each of the probes (17) comprises a wedge block, in which a water injection hole (13) is provided, and a plurality of the water injection holes (13) are connected to the water distributor (10) via a hose.

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