Thick-wall butt weld multi-form automatic ultrasonic detection device and method

Abstract

The invention discloses a multi-form automatic ultrasonic detection device and method for thick-wall butt welds.According to the device, an automatic ultrasonic detection system combining TOFD and PAUT technologies is combined to overcome the defects of RT detection, eight probe clamping modules are fixedly installed in the device through probe clamping rods, one probe is clamped on each probe clamping module, and the probe clamping rods are connected with the probe clamping modules; the eight probes can be selected and called according to the actual situation of the welding seam, the distance and the angle between the probes can be adjusted so as to obtain the most comprehensive detection result, the detection of the deep welding seam can be completed at a time by synchronously fixing and moving the eight probes, the detection speed is high, and the detection result is accurate and reliable. And the method plays a crucial role in ensuring the welding seam quality of the nuclear island main equipment.

Description

Technical Field

[0001] The present invention relates to an automatic ultrasonic testing device and method for multi-form thick-walled butt welds of main nuclear island equipment such as steam generators and pressurizers, and particularly to an automatic ultrasonic testing device for multi-form thick-walled butt welds and its testing method, belonging to the field of non-destructive testing technology. Background Art

[0002] Currently, in the field of industrial inspection, radiographic testing (RT) technology is widely used because it can detect internal defects of materials. However, RT technology has limitations. For example, its ability to detect surface defects is limited, there is a radiation risk, and the process of film processing in RT technology will extend the inspection cycle. It is difficult to clearly distinguish the tip extension of the image of area-type defects (such as cracks, lack of fusion, etc.) on the negative film, resulting in a smaller defect quantification. Therefore, there is an urgent need to propose a new technical solution to solve the above problems.

[0003] With the continuous development of industry standards and specifications, the field of welding inspection is undergoing a transformation from traditional film radiography technology to more advanced ultrasonic testing technology. Phased array ultrasonic testing (PAUT) and time of flight diffraction (TOFD) are representatives of this trend. TOFD testing technology relies on diffraction signals obtained from the "end corners" and "end points" of defects to detect, quantify, and locate defects. Accurate measurement of dimensions is beneficial to reducing the number of false defects. It can be seen from the principle that TOFD technology is very accurate in quantifying and locating vertical-direction defects, with an accuracy error of less than 1 mm, while RT technology can only determine the length of defects. Therefore, TOFD technology can reduce the misjudgment rate of inspections and play a crucial role in the inspection of large-wall-thickness pipelines. Phased array ultrasonic testing technology realizes the deflection and focusing of sound beams by arranging the wafer array in the probe, thereby performing multi-angle and all-round inspections on the object to be inspected. Compared with RT technology, phased array testing technology has the following three advantages: First, it can supplement the detection blind area of RT technology and provide a reliable solution for 100% inspection of special workpieces such as fillet welds, coarse-grained materials, extremely thin plates, or extremely thick plates; Second, phased array testing technology has multi-angle scanning capabilities and can detect various types of defects, while RT technology can only detect defects with a large included angle with the sound beam; Third, the data collected by phased array testing technology can be saved and viewed by multiple people after being saved. This transformation not only significantly improves safety but also reduces production costs.

[0004] In order to supplement the shortcomings of RT technology, the time-of-flight diffraction method and phased array ultrasonic testing can be performed sequentially. If the two detection methods are used in combination, the number of scans and operations can be reduced, the inspection efficiency can be improved, and the data quality can be optimized. However, when these two detection methods are applied at the same time, it is difficult to maintain the same mechanical reference position. The offset between the scanning start position and the welding centerline will lead to inaccurate positioning of defect indications; using different models of machines for PAUT and TOFD detection may also result in different indication lengths of defects because each technology has its own calibration process. Therefore, realizing automated detection of PAUT and TOFD technology is a complex task, and this combination of technologies to supplement RT detection has a series of challenges that need to be solved. Summary of the invention

[0005] In order to overcome the above problems, the inventors have conducted intensive research and designed a multi-form automated ultrasonic detection device and method for thick-walled butt welds. The device combines the automated ultrasonic detection system of TOFD and PAUT technology to supplement the shortcomings of RT detection. In the device, 8 probe clamping modules are fixedly installed by probe clamping rods, and each probe clamping module clamps a probe. The 8 probes can be selected and called according to the actual situation of the weld, and the distance and angle between the probes can be adjusted to obtain the most comprehensive detection results. By synchronously fixing and moving the 8 probes, the detection of deep welds can be completed at one time. The detection speed is fast, and the detection results are accurate and reliable, which plays a vital role in ensuring the quality of the welds of the main equipment of the nuclear island; thus completing the present invention.

[0006] Specifically, the purpose of the present invention is to provide a multi-form automatic ultrasonic detection device for thick-walled butt welds, the detection device comprising a long strip base 1, two transfer rods 2 are arranged in the middle of the base, two probe clamping rods 3 are installed on each of the transfer rods 2, and a total of four probe clamping rods 3 are arranged parallel to each other.

[0007] Two probe clamping modules 4 are arranged on each probe clamping rod 3, and each probe clamping module 4 can clamp a probe 5, wherein the probe 5 includes a PA probe and / or a TOFD probe;

[0008] The base 1 drives eight probes to move synchronously to jointly perform automated ultrasonic testing on thick-wall butt welds.

[0009] Wherein, magnetic adsorption wheels 11 are arranged at both ends of the long strip base 1 to fix the base 1 on the workpiece to be inspected, and the base 1 is controlled to move along the weld by controlling the rotation of the magnetic adsorption wheels 11 .

[0010] The probe clamping module 4 includes a base block 41 mounted on the probe clamping rod 3 and capable of lateral movement.

[0011] An adjusting block 42 capable of sliding longitudinally along the base block 41 is arranged on the base block 41, and a support rod 43 capable of sliding longitudinally along the adjusting block 42 is arranged on the adjusting block 42.

[0012] A top rod 44 located above the adjusting block 42 is arranged at the top of the support rod 43, and a clamping jaw 45 is arranged at the bottom of the support rod 43.

[0013] A jacking rod 46 capable of telescoping in the longitudinal direction is arranged on the top rod 44.

[0014] The jacking rod 46 is screwed and fixed on the top rod 44, and the end of the jacking rod 46 abuts against the adjusting block 42; the distance between the support rod 43 and the clamping jaw 45 relative to the adjusting block 42 in the longitudinal direction is adjusted by the jacking rod 46.

[0015] Wherein, hanging posts 47 protruding outwards are arranged at the end of the top rod 44 and on the adjusting block 42, and a tension spring 48 is hung between the two hanging posts 47. The clamping jaw 45 is stretched downwards along the longitudinal direction by the tension spring 48, so that the probe 5 on the clamping jaw 45 is closely attached to the workpiece to be detected.

[0016] Wherein, scale lines are engraved on the probe clamping rod 3, and the installation position of the probe clamping module 4 is assisted to be positioned by the scale lines.

[0017] Wherein, a laser alignment module 6 is arranged in the middle of one probe clamping rod 3. The laser alignment module 6 can emit laser continuously irradiating the weld seam, so as to provide a calibration basis for the movement of the base 1.

[0018] Wherein, a sensor probe 7 is further arranged on the base 1 outside the magnetic adsorption wheel 11.

[0019] Outside the base 1, on the workpiece to be detected, a reference body 8 is arranged along the direction of the weld seam. On the reference body 8, a continuous detection surface of the sensor probe 7 is arranged on the side adjacent to the base 1; the sensor probe 7 can continuously detect the distance between the sensor probe 7 and the reference body 8, so as to obtain the lateral offset of the base 1 relative to the reference body 8, and further generate a motion compensation instruction to correct the motion trajectory of the base 1.

[0020] Wherein, a linear encoder 9 is arranged in the middle of one probe clamping rod 3. The movement state of the base 1 is recorded by the linear encoder 9, so as to encode and record the detection position of the probe 5.

[0021] Wherein, a data conduit is connected to the probe 5, and the detection device further includes a data processing module and a display screen connected to the data conduit.

[0022] A chain hoist is provided on the base 1, and the data conduit is fixed and conveyed through the chain hoist, so that the data conduit can move synchronously with the base 1.

[0023] This application also provides a multi-form automatic ultrasonic testing method for thick-walled butt welds, which is realized by the auxiliary device for measuring the relevant dimensions of the electric heating element sleeve holes described above;

[0024] Preferably, the method includes the following steps:

[0025] Step 1, select the type and relative position of the probe 5 according to the depth of the weld to be detected;

[0026] Step 2, install the probe clamping module 4 and the probe 5 at the predetermined positions on the probe clamping rod 3, and then install the adapter rod 2 and the probe clamping rod 3 on the base 1;

[0027] Step 3, fix the base 1 on the thick-walled butt weld workpiece to be detected through the magnetic adsorption wheel 11, and use the laser alignment module to achieve precise alignment of the auxiliary device and the workpiece to be detected;

[0028] Step 4, control and adjust the probe 5 to abut against the workpiece to be detected through the probe clamping module 4, and control its abutting pressure;

[0029] Step 5, set the movement parameters of the base 1, and set the detection parameters and scanning mode of the probe 5;

[0030] Step 6, start the detection. The magnetic adsorption wheel 11 drives the base 1 to crawl along the weld extension direction. At the same time, the linear encoder encodes the detection position. The TOFD probe emits and receives ultrasonic signals, and the signals are transmitted to the data processing module through the data conduit, and the detection results are displayed in real time on the display screen after processing.

[0031] The beneficial effects of the present invention include:

[0032] (1) According to the multi-form automatic ultrasonic testing device and method for thick-walled butt welds provided by the present invention, the device can flexibly cope with various detection scenarios. This flexibility not only helps to improve the detection efficiency, but also can streamline the operation process, making this portable system provide strong support for on-site detection;

[0033] (2) According to the multi-form automatic ultrasonic testing device and method for thick-walled butt welds provided by the present invention, the technical combination of PAUT and TOFD detections can reduce the number of scans and operations, improve the inspection efficiency, optimize the data quality, and supplement the deficiencies of the RT technology in detection blind spots and image storage, etc.;

[0034] (3) According to the multi-form automatic ultrasonic testing device and method for thick-walled butt welds provided by the present invention, the device and method can achieve high automation, can realize full-automatic ultrasonic scanning, reduce the risk of human error, and further improve the detection efficiency and accuracy;

[0035] (4) According to the multi-form automatic ultrasonic testing device and method for thick-walled butt welds provided by the present invention, the device and method are easy to operate. Just set the detection parameters, and then the detection can be carried out automatically;

[0036] (5) According to the multi-form automatic ultrasonic testing device and method for thick-walled butt welds provided by the present invention, the detection result is intuitive, and the detection result can be displayed in real time on the display, which is convenient for users to analyze and judge;

[0037] (6) According to the multi-form automatic ultrasonic testing device and method for thick-walled butt welds provided by the present invention, the device and method have a wide range of applications. They can be used for ultrasonic testing of various materials and workpieces, and can be equipped with conventional probes, PA probes and TOFD probes;

[0038] (7) According to the multi-form automatic ultrasonic testing device and method for thick-walled butt welds provided by the present invention, the linear encoder therein can accurately record the detection position, which is convenient for subsequent data processing and analysis;

[0039] (8) According to the multi-form automatic ultrasonic testing device and method for thick-walled butt welds provided by the present invention, the laser alignment module in the device can achieve precise alignment and improve the detection accuracy;

[0040] (9) According to the multi-form automatic ultrasonic testing device and method for thick-walled butt welds provided by the present invention, the magnetic adsorption wheels, sensor probes and reference bodies of the device are used in cooperation, which can ensure the stability of the device during the working process, and at the same time is convenient for installation and disassembly, reduce the auxiliary period of arranging the track, and improve the detection efficiency. Description of the Drawings

[0041] Figure 1 Shows the overall structural schematic diagram of the multi-form automatic ultrasonic testing device for thick-walled butt welds provided by the present application;

[0042] Figure 2 Shows the structural schematic diagram of the probe clamping module in the multi-form automatic ultrasonic testing device for thick-walled butt welds provided by the present application;

[0043] Figure 3 Shows the detection area schematic diagram of the TOFD probe in the embodiment of the present application;

[0044] Figure 4Schematic diagram of the detection area of the PA probe with model number 5L320.6×10 in the embodiment of the present application is shown;

[0045] Figure 5 Schematic diagram of the detection area of the PA probe with model number 2.25L32-0.75×24 in the embodiment of the present application is shown.

[0046] Description of reference numerals

[0047] 1 - Base

[0048] 11 - Magnetic adsorption wheel

[0049] 2 - Adapter rod

[0050] 3 - Probe clamping rod

[0051] 4 - Probe clamping module

[0052] 41 - Base block

[0053] 42 - Adjusting block

[0054] 43 - Support rod

[0055] 44 - Thrust rod

[0056] 45 - Clamping jaw

[0057] 46 - Jacking rod

[0058] 47 - Hanging post

[0059] 48 - Tension spring

[0060] 5 - Probe

[0061] 6 - Laser alignment module

[0062] 7 - Sensor probe

[0063] 8 - Reference body

[0064] 9 - Linear encoder Detailed implementation manners

[0065] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Through these descriptions, the features and advantages of the present invention will become more clearly defined.

[0066] The special term "exemplary" here means "serving as an example, embodiment, or illustration". Any embodiment described as "exemplary" here does not have to be construed as superior or better than other embodiments. Although various aspects of the embodiments are shown in the drawings, the drawings do not have to be drawn to scale unless otherwise specified.

[0067] The present invention provides a multi-form automatic ultrasonic detection device for thick-wall butt welds, asFigure 1 and Figure 2 As shown in Figure 2 , the detection device includes a strip-shaped base 1. Two adapter rods 2 are arranged in the middle of the base. Two probe clamping rods 3 are installed on each of the adapter rods 2. A total of four probe clamping rods 3 are arranged parallel to each other.

[0068] In this application, the adapter rod 2 can rotate around the base by an appropriate angle to facilitate adjusting the arrangement height of the probe and prevent damage to the probe during movement and placement.

[0069] Two probe clamping modules 4 are arranged on each probe clamping rod 3. Each probe clamping module 4 can clamp a probe 5. The probe 5 includes a PA probe and / or a TOFD probe; each probe corresponds to a data conduit and a data processor for data transmission. The detection device in this application integrates PAUT and TOFD technologies. To meet the requirements of thick weld detection in the nuclear power field, the power supply voltage of this detection device is 240V AC, it can work normally in an environment of 0°C - 45°C, can drive low-frequency probes such as 0.5MHz probes and high-frequency probes such as 20MHz probes, the trigger voltage can reach 200V, the digitization frequency is 100MHz, the maximum pulse repetition frequency is 20KHz, supports digital filtering and digital smoothing, can simultaneously excite at least 64 wafers, achieves at least 64 ultrasonic channels, and can adjust the focusing rule based on the detection position of the phased array probe. Through interface conversion, it can support at least 16 channels for conventional ultrasonic detection or TOFD detection, supports high-speed data transmission of 20MB / s, and has a 16-bit amplitude resolution.

[0070] Preferably, the base 1 drives eight probes to move synchronously to perform automated ultrasonic detection on thick-walled butt welds.

[0071] In a preferred embodiment, magnetic adsorption wheels 11 are arranged at both ends of the strip-shaped base 1 to fix the base 1 on the workpiece to be detected, and the base 1 is controlled to move along the weld by controlling the rotation of the magnetic adsorption wheels 11. The target products applied by the detection device in this application are all low-alloy steel ferromagnetic materials.

[0072] Preferably, a sensor probe 7 is further arranged on the base 1 outside the magnetic adsorption wheels 11;

[0073] On the outside of the base 1, on the workpiece to be detected, a reference body 8 is arranged along the direction of the weld. The reference body is arranged precisely and is completely consistent with the extension direction of the weld. On the reference body 8, a continuous detection surface of the sensor probe 7 is set on the side adjacent to the base 1; the sensor probe 7 can continuously detect and obtain the distance between the sensor probe 7 and the reference body 8, thereby obtaining the lateral offset of the base 1 relative to the reference body 8, and then generating a motion compensation instruction to correct the motion trajectory of the base 1. The movement of the base 1 in this application can be automatically controlled under the coordinated action of the sensor probe 7 and the reference body 8.

[0074] In a preferred embodiment, Figure 2 As shown in the figure, the probe clamping module 4 includes a base block 41 installed on the probe clamping rod 3 and capable of horizontal movement. The horizontal direction in this application refers to a direction perpendicular to the weld on a plane parallel to the workpiece to be inspected; a locking mechanism is provided on the base block 41, which can be locked by the locking mechanism after being moved to a suitable position on the probe clamping rod 3 to avoid sliding during the detection process; the base block 41 is set to a sliding structure mainly to adapt to welds of different depths. During operation, the corresponding position of the base block 41 will be set according to the weld depth and the depth range to be inspected by the probe.

[0075] An adjusting block 42 capable of sliding longitudinally along the base block 41 is arranged on the base block 41, and the longitudinal direction in this application refers to the direction perpendicular to the workpiece to be detected; a supporting rod 43 capable of sliding longitudinally along the adjusting block 42 is arranged on the adjusting block 42, and a sliding limiting structure is arranged at the above two longitudinal sliding positions, preferably a dovetail groove structure, which allows only longitudinal sliding between each other and eliminates the degree of freedom in other directions; further, a locking mechanism is also arranged on the adjusting block 42, which can lock and fix the adjusting block 42 on the base block 41 according to actual needs.

[0076] A push rod 44 located above the adjustment block 42 is provided at the top of the support rod 43, and a clamping claw 45 is provided at the bottom of the support rod 43; the push rod 44, the support rod 43 and the clamping claw 45 are fixed together by welding or screwing with bolts and move synchronously.

[0077] The jacking rod 44 is provided with a jacking rod 46 which can be extended and retracted in the longitudinal direction.

[0078] The lifting rod 46 is screwed and fixed on the lifting rod 44, and the end of the lifting rod 46 abuts against the adjusting block 42; the lifting rod 46 is used to adjust the longitudinal distance between the support rod 43 and the clamping claw 45 relative to the adjusting block 42, so as to control the longitudinal distance between the clamping claw 45 and the base 1, thereby adjusting the distance between the probe 5 and the workpiece to be detected.

[0079] Preferably, hanging posts 47 extending outward are provided at the end of the ejector rod 44 and on the adjusting block 42. A tension spring 48 is hung between the two hanging posts 47. The clamping jaw 45 is stretched downward longitudinally by the tension spring 48, so that the probe 5 on the clamping jaw 45 is pressed against the workpiece to be detected. Moreover, the pressure between the probe 5 and the workpiece to be detected can be adjusted based on the stretching amount of the spring.

[0080] In a preferred embodiment, scale lines are engraved on the probe clamping rod 3, and the installation position of the probe clamping module 4 is assisted in positioning through the scale lines, so as to realize the rapid installation and positioning of the probe 5.

[0081] In a preferred embodiment, a laser alignment module 6 is provided in the middle of a probe clamping rod 3. The laser alignment module 6 can emit a laser that continuously irradiates the weld seam, so as to provide a calibration basis for the movement of the base 1. Before the detection starts, when installing the base, the weld seam is irradiated by the laser alignment module 6, which is convenient for the centering and positioning of the base 1. During the detection and movement of the base, the operator judges whether the traveling direction of the base is offset by observing the relative position between the laser line and the weld seam. When it is found that there is an offset, it can be corrected in time or re-detected to avoid the detection result being distorted due to the offset of the base.

[0082] In a preferred embodiment, a linear encoder 9 is provided in the middle of a probe clamping rod 3. The movement state of the base 1 is recorded by the linear encoder 9, so as to encode and record the detection position of the probe 5. Since multiple groups of probes are carried on the base 1, multiple groups of probes have to pass through the same weld seam position successively and detect different depths of the weld seam position respectively. This requires accurate recording of each position point on the weld seam in order to produce detection results for each weld seam position point. In this application, by setting the above linear encoder 9 and combining its encoding result with the detection result of the probe, the accuracy and visualization of the detection result are realized.

[0083] In a preferred embodiment, a data conduit is connected to the probe 5. The detection device further includes a data processing module and a display screen connected to the data conduit; a guide chain is provided on the base 1, and the data conduit is fixed and conveyed through the guide chain, that is, the data conduit can move synchronously with the base 1. The guide chain and the conduit are not shown in the figure.

[0084] Preferably, a cooling water pipe is also correspondingly provided on each probe 5. The cooling water is also conveyed through the guide chain, so as to ensure that the probe 5 can continuously work for a long time. More preferably, the data conduit on the probe 5 can be coupled with the cooling water pipe into a pipeline, thereby reducing the overall complexity of the device and the operation difficulty.

[0085] The present invention also provides a multi-form automatic ultrasonic detection method for thick-wall butt welds, which is realized by the auxiliary device for measuring the relevant dimensions of the electric heating element sleeve holes described above;

[0086] Preferably, the method includes the following steps:

[0087] Step 1: Select the type and relative position of the probe 5 according to the depth of the weld to be detected. For example, when the weld to be detected is a 150-mm deep weld, select 6 TOFD probes to form 3 pairs, and then select two PA probes. Among the 3 pairs of TOFD probes, the first pair of two probes are located on the same probe clamping rod, and the distance between them is 130 mm. The probe model is 7.5 MHz Φ3 mm, and the wedge angle is 70 degrees, that is, the refraction angle for detection is 70 degrees, which can detect near-surface defects. The second pair of two probes are located on the same probe clamping rod, and the distance between them is 280 mm. The probe model is 5 MHz Φ6 mm, and the wedge angle is 60 degrees, that is, the refraction angle for detection is 60 degrees, which can detect deeper defects. The third pair of two probes are located on the same probe clamping rod, and the distance between them is 300 mm. The probe model is 3.5 MHz Φ9.5 mm, and the wedge angle is 45 degrees, that is, the refraction angle for detection is 45 degrees, which can detect even deeper defects. Among the two PA probes, the first one has a depth range on the 90° side, the probe model is 5L320.6×10, the wedge is made of organic glass material and has a short-front design with an incident angle of 55°, the angle range is 40° - 68°, semi-path focusing, 100 mm, and the maximum allowable step offset is 110 mm. The second one has a depth range on the 270° side, the probe model is 2.25L32-0.75×24, the wedge is made of organic glass material and has a short-front design with an incident angle of 45°, the angle range is 35° - 60°, semi-path focusing, 160 mm, and the maximum allowable step offset is 170 mm. Such a probe combination can just comprehensively and without dead angles detect and know the welding quality of the 150-mm deep weld, and can ensure accurate and non-missing detection results.

[0088] Step 2: Install the probe clamping module 4 and the probe 5 at the predetermined positions on the probe clamping rod 3, and then install the adapter rod 2 and the probe clamping rod 3 on the base 1;

[0089] Step 3: Fix the base 1 on the thick-wall butt weld workpiece to be detected through the magnetic adsorption wheel 11, and use the laser alignment module to achieve precise alignment of the auxiliary device with the workpiece to be detected; ensure that the probes are symmetrically arranged on both sides of the weld;

[0090] Step 4: Control and adjust the probe 5 to abut against the workpiece to be detected through the probe clamping module 4, and control its abutting pressure;

[0091] Step 5: Set the movement parameters of the base 1, the detection parameters of the probe 5, and the scanning method.

[0092] Step 6: Start the detection. The magnetic adsorption wheel 11 drives the base 1 to crawl along the weld extension direction. Meanwhile, the linear encoder encodes the detection position. The TOFD probe emits and receives ultrasonic signals, and the signals are transmitted through the data conduit to the data processing module. After processing, the detection results are displayed in real time on the display screen. During the detection process, after one detection position is scanned back and forth, the base drives the ultrasonic probe to move to the next detection position, and the step offset is 110 mm. At this time, it is necessary to ensure that the detection ranges of the two probes overlap by at least 20%. Repeat the above process until the detection of the entire workpiece is completed.

[0093] The detection results include ultrasonic images, detection data, etc. Finally, after the detection is completed, according to the detection position information recorded by the encoding module, the detection results are analyzed and processed. This detection method follows the standards of NB / T47013.3, NB / T47013.10, and NB / T47013.15. It is simple to operate and easy to master, and the detection results are easy to analyze.

[0094] Embodiment

[0095] Two workpieces with a wall thickness of 150 mm are butt-welded, and the weld length is 1 m. After welding is completed, quality inspection is carried out on this weld using the multi-form automatic ultrasonic detection device for thick-wall butt welds as shown in Figure 1 and Figure 2 . The specific steps are as follows:

[0096] Step 1: Select 6 TOFD probes to form 3 pairs, and then select two PA probes. Among them, the arrangement information of the TOFD probes is shown in Table 1 below, and the arrangement information of the PA probes is shown in Table 2 below:

[0097] Table 1 TOFD

[0098] Probe pair Wedge block Probe center spacing The first pair 7.5MHz Φ3mm 70° ≈130 The second pair 5MHz Φ6mm 60° ≈280 The third pair 3.5MHz Φ9.5mm 45° ≈300

[0099] Table 2 PA

[0100]

[0101] The detection area of the TOFD probe is as shown in Figure 3 . The detection area of the PA probe with the model number 5L320.6×10 is as shown in Figure 4 . The detection area of the PA probe with the model number 2.25L32-0.75×24 is as shown in Figure 5 .

[0102] Step 2: Install the probe clamping module 4 and the probe 5 at the predetermined positions on the probe clamping rod 3, and then install the adapter rod 2 and the probe clamping rod 3 on the base 1;

[0103] Step 3: Fix the base 1 on the thick-walled butt weld workpiece to be detected through the magnetic adsorption wheel 11, and use the laser alignment module to achieve precise alignment of the auxiliary device and the workpiece to be detected, ensuring that the probes are symmetrically arranged on both sides of the weld;

[0104] Step 4: Control and adjust the probe 5 to abut against the workpiece to be detected through the probe clamping module 4;

[0105] Step 5: Set the movement parameters of the base 1, with a step offset of 110 mm, and set the detection parameters and scanning mode of the probe 5;

[0106] Step 6: Start the detection. The magnetic adsorption wheel 11 drives the base 1 to crawl along the weld extension direction, and at the same time, the linear encoder encodes the detection position; during the crawling process, the movement trajectory is automatically corrected based on the reference body, and the movement trajectory is monitored based on the laser alignment module;

[0107] The TOFD probe emits and receives ultrasonic signals. The signals are transmitted to the data processing module through the data conduit, and after processing, the detection results are displayed in real time on the display screen. The specific results are as follows:

[0108]

[0109] The combined installation and detection process of the above detection equipment is completed by 2 operators working together, with a total time of 1 hour.

[0110] Comparative Example

[0111] Retrieve the welded workpiece in the embodiment and perform weld detection on its 1m long weld again. The detection method is radiographic testing (RT). For surface defects that may be missed, TOFD detection is used for supplementation. The detection is carried out in accordance with the NB / T47013.2 and NB / T47013.10 standards. The final detection results are as follows:

[0112]

[0113] The combined installation and detection process of the above detection equipment is completed by 2 operators working together, with a total time of 1.5 hours.

[0114] From the above embodiments and comparative examples, it can be seen that the multi-form automatic ultrasonic detection device and method for thick-walled butt welds provided by the present application can quickly and efficiently complete the detection work of thick-walled butt welds, with good detection effects, accurate results, rich information, and high reliability.

[0115] The present invention has been described in conjunction with preferred embodiments, but these embodiments are merely exemplary and serve only an illustrative function. On this basis, various substitutions and improvements can be made to the present invention, and these all fall within the protection scope of the present invention.

Claims

1. A multi-form automatic ultrasonic detection device for thick-walled butt welds, characterized in that: The detection device comprises a long strip-shaped base (1), two transfer rods (2) are arranged in the middle of the base, two probe clamping rods (3) are installed on each of the transfer rods (2), and a total of four probe clamping rods (3) are arranged parallel to each other. Two probe clamping modules (4) are arranged on each probe clamping rod (3), and each probe clamping module (4) is capable of clamping a probe (5), wherein the probe (5) comprises a PA probe and / or a TOFD probe; The base (1) drives eight probes to move synchronously, and together performs automated ultrasonic testing on thick-wall butt welds.

2. The multi-form automatic ultrasonic detection device for thick-walled butt welds according to claim 1 is characterized in that: Magnetic adsorption wheels (11) are provided at both ends of the long strip base (1) for fixing the base (1) on the workpiece to be inspected, and the base (1) is controlled to move along the weld by controlling the rotation of the magnetic adsorption wheels (11).

3. The multi-form automatic ultrasonic detection device for thick-walled butt welds according to claim 1 is characterized in that: The probe clamping module (4) comprises a base block (41) mounted on the probe clamping rod (3) and capable of lateral movement. An adjusting block (42) capable of sliding longitudinally along the base block (41) is arranged on the base block (41), and a supporting rod (43) capable of sliding longitudinally along the adjusting block (42) is arranged on the adjusting block (42). A top rod (44) located above the adjustment block (42) is arranged at the top of the support rod (43), and a clamping claw (45) is arranged at the bottom of the support rod (43); A lifting rod (46) which can be extended and retracted in the longitudinal direction is arranged on the lifting rod (44). The lifting rod (46) is screwed and fixed on the lifting rod (44), and the end of the lifting rod (46) abuts against the adjustment block (42); the longitudinal distance between the support rod (43) and the clamping claw (45) relative to the adjustment block (42) is adjusted by the lifting rod (46).

4. The multi-form automatic ultrasonic detection device for thick-walled butt welds according to claim 3 is characterized in that: A hanging column (47) extending outward is provided on the end of the push rod (44) and the adjusting block (42), and a tension spring (48) is hung between the two hanging columns (47). The clamping claw (45) is stretched downward in the longitudinal direction by the tension spring (48), so that the probe (5) on the clamping claw (45) is closely attached to the workpiece to be detected.

5. The multi-form automatic ultrasonic detection device for thick-walled butt welds according to claim 1 is characterized in that: Graduation lines are engraved on the probe clamping rod (3), and the installation position of the probe clamping module (4) is assisted by the graduation lines.

6. The multi-form automatic ultrasonic detection device for thick-walled butt welds according to claim 1 is characterized in that: A laser alignment module (6) is arranged in the middle of a probe clamping rod (3), and the laser alignment module (6) can emit laser light for continuously irradiating the weld seam, so as to provide a calibration basis for the movement of the base (1).

7. The multi-form automatic ultrasonic detection device for thick-walled butt welds according to claim 2 is characterized in that: A sensor probe (7) located outside the magnetic adsorption wheel (11) is also provided on the base (1); On the outside of the base (1), on the workpiece to be detected, a reference body (8) is arranged along the direction of the weld, and on the reference body (8), a continuous detection surface of the sensor probe (7) is arranged on the side adjacent to the base (1); the sensor probe (7) can continuously detect and obtain the distance between the sensor probe (7) and the reference body (8), thereby obtaining the lateral offset of the base (1) relative to the reference body (8), and then generating a motion compensation instruction to correct the motion trajectory of the base (1).

8. The multi-form automatic ultrasonic detection device for thick-walled butt welds according to claim 1 is characterized in that: A linear encoder (9) is arranged in the middle of a probe clamping rod (3), and the moving state of the base (1) is recorded by the linear encoder (9), thereby encoding and recording the detection position of the probe (5).

9. The multi-form automatic ultrasonic detection device for thick-walled butt welds according to claim 1, characterized in that: The probe (5) is connected to a data conduit, and the detection device further comprises a data processing module and a display screen connected to the data conduit; A guide chain is arranged on the base (1), and the data conduit is fixed and transported by the guide chain, so that the data conduit can move synchronously with the base (1).

10. A multi-form automated ultrasonic testing method for thick-walled butt welds, characterized in that: The method is implemented by the auxiliary device for measuring the relevant dimensions of the casing hole of the electric heating element according to any one of claims 1 to 9; Preferably, the method comprises the following steps: Step 1, selecting the type and relative position of the probe (5) according to the depth of the weld to be detected; Step 2, installing the probe clamping module (4) and the probe (5) to a predetermined position on the probe clamping rod (3), and then installing the adapter rod (2) and the probe clamping rod (3) to the base (1); Step 3, fixing the base (1) on the thick-walled butt weld workpiece to be inspected by means of a magnetic adsorption wheel (11), and using a laser alignment module to achieve accurate alignment between the auxiliary device and the workpiece to be inspected; Step 4, controlling and adjusting the probe (5) to abut against the workpiece to be inspected through the probe clamping module (4), and controlling the abutting pressure thereof; Step 5, setting the movement parameters of the base (1), setting the detection parameters and scanning mode of the probe (5); Step 6, start the detection, the magnetic adsorption wheel (11) drives the base (1) to crawl along the extension direction of the weld, and at the same time the linear encoder encodes the detection position, the TOFD probe transmits and receives ultrasonic signals, and the signals are transmitted to the data processing module through the data conduit, and the detection results are displayed in real time on the display screen after processing.

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