Electromagnetic ultrasonic automatic monitoring method and device for burrs in weld joint of high-frequency welded pipe

Abstract

The invention relates to the technical field of ultrasonic nondestructive testing, in particular to an electromagnetic ultrasonic automatic monitoring method for burrs in a welding seam of a high-frequency welded pipe, which comprises the following steps of: 1, designing an electromagnetic ultrasonic transducer capable of generating longitudinal waves; 2, the inner burr morphology of the welding seam of the high-frequency welded pipe is summarized into four types; 3, quantitatively evaluating the inner burrs of the welding seam of the high-frequency welded pipe according to the morphology type of the inner burrs, and displaying a result on a monitor through a pulse signal generation processor; according to the invention, an electromagnetic ultrasonic monitoring and detecting principle is utilized, an electromagnetic ultrasonic transducer is applied to quickly and automatically monitor the conditions of complete burr scraping, irregular scraping, excessive scraping, insufficient scraping and the like at high temperature, and meanwhile, an inner burr monitoring device for the welding seam of the high-frequency welded pipe is developed, so that the inner burrs of the welding seam of the high-frequency welded pipe can be quantitatively evaluated; and electromagnetic ultrasonic detection has the characteristics of non-contact detection, high-temperature monitoring, easy realization of automatic detection, high detection speed, high detection sensitivity and the like.

Description

Technical Field

[0001] This invention relates to the field of ultrasonic nondestructive testing technology, and in particular to an automatic electromagnetic ultrasonic monitoring method and device for burrs inside weld seams of high-frequency welded pipes. Background Technology

[0002] With the continuous increase in the transmission pressure and steel grade of oil and gas pipelines, the requirements for high-frequency welded pipes used in oil and gas transportation are also constantly increasing. High-frequency welded pipes are widely used in subsea pipelines, such as in the CNOOC Wenchang Oilfield Cluster Development Project, the Panyu / Huizhou Natural Gas Development Project, and the Ping-Huang Subsea Pipeline Project. High-frequency welded pipes are produced by continuously rolling hot-rolled coils, utilizing the skin effect and proximity effect of high-frequency current to generate resistance heat at the edges of the coils, causing metal melting. Pressure welding is then performed under the action of extrusion rollers. Its characteristics include: high welding speed (due to the highly concentrated current energy in the welding zone, the heating speed is extremely fast, resulting in a high welding speed, typically 10-45 meters per minute); small heat-affected zone (due to the high welding speed and strong self-cooling effect of the workpiece, the heat-affected zone is small and oxidation is less likely, resulting in welds with better microstructure and properties, and high dimensional accuracy. Therefore, the quality of the weld seam in high-frequency welded pipes becomes a primary control objective.

[0003] The main production process of high-frequency welded pipe includes: automatic uncoiling → automatic head cutting and butt welding → spiral looper → multi-roll forming → high-frequency welding (induction welding or contact welding) → removal of internal and external burrs → online inspection → post-weld heat treatment → sizing and straightening → length cutting with flying saw → end face processing → hydrostatic testing → offline weld inspection, etc. From the high-frequency welded pipe production process, it is clear that there are two key stages in the quality control of high-frequency welded pipe: online inspection and offline inspection. Online inspection is a crucial process for strictly monitoring welding quality. To avoid batch welding quality problems, real-time quality monitoring of weld quality and the scraping of internal and external burrs is conducted. Offline inspection... Ultrasonic testing of weld seams after hydraulic pressure testing is a crucial step in the process of high-frequency welded pipes. All steel pipes used for oil and gas transportation or low-pressure liquid transportation should undergo 100% ultrasonic testing of weld seams before final delivery. In addition to the alarms triggered by automatic testing equipment, manual verification is required. Weld seam defects verified by manual verification must be removed or scrapped. Due to the high temperature and fast production speed during online testing of high-frequency welded pipes, it is necessary to monitor the weld quality and the scraping of internal and external burrs in real time in order to solve the problem of burrs inside the weld seams, control the surface quality of the weld seams, and reduce the stress concentration caused by the shape of the weld seams.

[0004] Therefore, to address the aforementioned problem of burr monitoring in high-frequency welded pipe welds, a monitoring method and device with features such as non-contact detection, high-temperature monitoring, easy automation, fast detection speed, and high detection sensitivity can be designed. Summary of the Invention

[0005] To overcome the problem that the high temperature and fast production speed during online inspection of high-frequency welded pipes make it difficult to monitor the weld quality and the scraping of internal and external burrs in real time.

[0006] The technical solution of this invention is: an automatic electromagnetic ultrasonic monitoring method for burrs inside high-frequency welded pipe welds, comprising the following steps:

[0007] Step 1: Design an electromagnetic ultrasonic transducer that can generate longitudinal waves. The electromagnetic ultrasonic transducer can generate different types of ultrasonic waves by combining different excitation coils and permanent magnets.

[0008] Step 2: The internal burr morphology of the high-frequency welded pipe weld is summarized into four types: well scraped, irregularly scraped, over-scraped, and under-scraped.

[0009] Step 3: High-frequency welded pipe welding involves continuously cold bending the strip steel to form a "V"-shaped meeting area at both edges. By applying a high-frequency induced current to the "V"-shaped area, the Joule heat concentration at the edge of the "V"-shaped area under the action of high-frequency induction or resistance heats the strip steel edge to melting while applying a certain extrusion pressure, forming burrs inside and outside the weld of the high-frequency welded pipe. The internal burrs are monitored by collecting relevant information on the weld of the high-frequency welded pipe in real time through an electromagnetic ultrasonic transducer. The internal burrs of the high-frequency welded pipe are quantitatively evaluated according to the morphology type of the internal burrs. The results are then displayed on the monitor after passing through a pulse signal generator processor.

[0010] Preferably, the ultrasonic waves generated by the electromagnetic ultrasonic transducer are longitudinal waves, SH waves, and SV waves.

[0011] As a preferred option, the electromagnetic ultrasonic transducer has a certain degree of fit with the surface of the steel pipe.

[0012] As a preferred option, the excitation mechanism of the electromagnetic ultrasonic transducer is mainly based on the Lorentz force. A high-frequency alternating current is passed through the excitation coil, which induces an alternating magnetic field on the metal surface, thereby generating eddy currents of the same frequency on the surface of the specimen. Under the action of the magnetic field of the permanent magnet, the alternating eddy currents generate the Lorentz force, causing the particles in the specimen to vibrate periodically. This vibration propagates within the specimen, eventually forming different types of ultrasonic waves. The principle of receiving sound waves is the reverse process described above. When the material being tested has magnetic permeability, the material lattice is also subject to magnetostrictive force and magnetization force. The magnetization intensity vector of the magnetic domains in the material will change due to the influence of the external magnetic field. During the magnetization process, the boundaries between magnetic domains move, resulting in mechanical deformation, which is the magnetostrictive effect. The magnetostrictive force, magnetization force, and Lorentz force are coupled with each other, thereby enhancing the sound wave excitation effect.

[0013] As a preferred option, the electromagnetic ultrasonic transducer collects information related to internal burrs on the high-frequency welded pipe weld in real time, including height and morphology information.

[0014] Preferably, the pulse signal generator processor displays the results on the monitor in B-type format.

[0015] As a preferred method, external burrs are primarily monitored via video. When the deviation between the real-time image and the standard image exceeds the set allowable deviation value, an alarm signal is issued.

[0016] An automatic electromagnetic ultrasonic monitoring device for burrs inside weld seams of high-frequency welded pipes, comprising the automatic electromagnetic ultrasonic monitoring method for burrs inside weld seams of high-frequency welded pipes as described in any one of the above-mentioned methods, including an electromagnetic ultrasonic transducer, a pulse signal generator and processor, and a monitor; further comprising a base frame and a reciprocating moving assembly for controlling the longitudinal movement of the electromagnetic ultrasonic transducer; the electromagnetic ultrasonic transducer includes a housing; a permanent magnet and an excitation coil are installed inside the housing; a socket is provided at the upper end of the housing; the electromagnetic ultrasonic transducer, the pulse signal generator and the monitor are electrically connected; the reciprocating moving assembly includes a fixed base; a ball screw is rotatably connected inside the fixed base; a screw pair is installed outside the ball screw; and a... It has a motor; a drive gear is mounted on the outside of the motor output shaft; a driven gear that meshes with the drive gear is mounted on the outside of the ball screw; a vertical support plate is fixedly connected to the upper left side of the base frame; a guide rail is fixedly connected to the upper right side of the vertical support plate; a moving plate is fixedly connected to the right end of the screw pair; a rotating seat is fixedly connected to the right end of the moving plate; a rotating plate is rotatably connected inside the rotating seat; an electromagnetic ultrasonic transducer is fixedly connected to the front end of the rotating plate; a telescopic cylinder is rotatably connected between the moving plate and the rotating plate; a sliding block that is fixedly connected to the moving plate is slidably connected inside the guide rail; a fixed seat is fixedly connected to the right end of the vertical support plate; a pulse signal generator processor and a monitor are both fixedly connected to the front end of the vertical support plate.

[0017] The beneficial effects of this invention are as follows: Utilizing the principle of electromagnetic ultrasonic monitoring, an electromagnetic ultrasonic transducer is applied to automatically monitor conditions such as intact burr scraping, irregular scraping, excessive scraping, and insufficient scraping at high temperatures and with rapid speed. At the same time, an internal burr monitoring device for high-frequency welded pipe seams has been developed, which can quantitatively evaluate the internal burrs of high-frequency welded pipe seams. Furthermore, electromagnetic ultrasonic testing has the characteristics of non-contact testing, high-temperature monitoring, easy automation, fast testing speed, and high testing sensitivity. Therefore, it can better monitor the weld quality and the scraping status of internal and external burrs in real time. Attached Figure Description

[0018] Figure 1 The diagram shown is a three-dimensional structural schematic of the electromagnetic ultrasonic automatic monitoring device for burrs inside the weld seam of high-frequency welded pipe according to the present invention.

[0019] Figure 2 The image shows the "V" shaped angular morphology during the high-frequency welded pipe extrusion process;

[0020] Figure 3The image shows the morphology of the inner and outer burrs after the weld seam of the high-frequency welded pipe is extruded and formed.

[0021] Figure 4 This demonstrates the principle of electromagnetic ultrasonic monitoring;

[0022] Figure 5 The displayed signal is the monitoring signal;

[0023] Figure 6 The image shown is a cross-sectional view of the electromagnetic ultrasonic transducer in the high-frequency welded pipe weld seam burr automatic electromagnetic ultrasonic monitoring device of the present invention.

[0024] Figure 7(a) shows the B-type result of intact burr scraping inside the weld of high-frequency welded pipe;

[0025] Figure 7(b) shows the B-type display of the irregular scraping result of burrs inside the weld of high-frequency welded pipe;

[0026] Figure 7(c) shows the B-type display of the result of excessive scraping of burrs inside the weld of high-frequency welded pipe;

[0027] Figure 7(d) shows the B-type result of insufficient burr scraping in the weld seam of high-frequency welded pipe;

[0028] Figure 8(a) shows the electromagnetic ultrasonic testing principle when the applied magnetic field is perpendicular to the current in the conductor. j - current in the conductor, B - excitation magnetic field generated by the applied magnetic field, Fm - magnetization force (ferromagnetic material), Fms - magnetostrictive force (ferromagnetic material), FL - Lorentz force (electric conductor).

[0029] Figure 8(b) shows the electromagnetic ultrasonic testing principle when the applied magnetic field is parallel to the current in the conductor. j - current in the conductor, B - excitation magnetic field generated by the applied magnetic field, Fm - magnetization force (ferromagnetic material), Fms - magnetostrictive force (ferromagnetic material), FL - Lorentz force (electric conductor).

[0030] Figure 9 The diagram shown is a three-dimensional structural schematic of the reciprocating moving component in the electromagnetic ultrasonic automatic monitoring device for burrs inside the weld seam of high-frequency welded pipes according to the present invention.

[0031] Explanation of reference numerals in the attached drawings: 1. Electromagnetic ultrasonic transducer; 101. Housing; 102. Permanent magnet; 103. Excitation coil; 104. Socket; 2. Pulse signal generator and processor; 3. Monitor; 401. Fixed base; 402. Ball screw; 403. Screw pair; 404. Motor; 405. Driving gear; 406. Driven gear; 5. Base frame; 6. Vertical support plate; 7. Guide rail; 8. Moving plate; 9. Rotating seat; 10. Rotating plate; 11. Telescopic cylinder; 12. Sliding block. Detailed Implementation

[0032] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0033] Please see Figure 1 , Figure 6 and Figure 9 This invention discloses an automatic electromagnetic ultrasonic monitoring device for burrs inside welded pipes, comprising an electromagnetic ultrasonic transducer 1, a pulse signal generator / processor 2, and a monitor 3; it also includes a base frame 5 and a reciprocating moving assembly for controlling the longitudinal movement of the electromagnetic ultrasonic transducer 1; the electromagnetic ultrasonic transducer 1 includes a housing 101; a permanent magnet 102 and an excitation coil 103 are installed inside the housing 101; a socket 104 is provided at the upper end of the housing 101; the electromagnetic ultrasonic transducer 1, the pulse signal generator / processor 2, and the monitor 3 are electrically connected; the reciprocating moving assembly includes a fixed base 401; a ball screw 402 is rotatably connected inside the fixed base 401; a screw pair 403 is installed outside the ball screw 402; a motor 404 is installed inside the fixed base 401; and the output shaft of the motor 404 is located outside the motor. A drive gear 405 is installed; a driven gear 406 that meshes with the drive gear 405 is installed on the outside of the ball screw 402; a vertical support plate 6 is fixedly connected to the upper left side of the base frame 5; a guide rail 7 is fixedly connected to the upper right side of the vertical support plate 6; a movable plate 8 is fixedly connected to the right end of the screw pair 403; a rotating seat 9 is fixedly connected to the right end of the movable plate 8; a rotating plate 10 is rotatably connected inside the rotating seat 9; an electromagnetic ultrasonic transducer 1 is fixedly connected to the front end of the rotating plate 10; a telescopic cylinder 11 is rotatably connected between the movable plate 8 and the rotating plate 10; a sliding block 12 that is fixedly connected to the movable plate 8 is slidably connected inside the guide rail 7; a fixed seat 401 is fixedly connected to the right end of the vertical support plate 6; a pulse signal generator processor 2 and a monitor 3 are both fixedly connected to the front end of the vertical support plate 6.

[0034] Example 1

[0035] Please see Figures 1-9 The present invention provides an embodiment of an automatic electromagnetic ultrasonic monitoring method for burrs inside high-frequency welded pipe welds, comprising the following steps:

[0036] Step 1: Design an electromagnetic ultrasonic transducer 1 that can generate longitudinal waves. The electromagnetic ultrasonic transducer 1 can generate different types of ultrasonic waves according to different combinations of excitation coils 103 and permanent magnets 102. The electromagnetic ultrasonic transducer 1 has a certain degree of fit with the surface of the steel pipe. The ultrasonic waves generated by the electromagnetic ultrasonic transducer 1 are longitudinal waves. The external magnetic field of the electromagnetic ultrasonic transducer 1 is perpendicular to the current in the conductor. Where j is the current in the conductor, B is the excitation magnetic field generated by the external magnetic field, Fm is the magnetizing force (ferromagnetic material), Fms is the magnetostrictive force (ferromagnetic material), and FL is the Lorentz force (electric conductor).

[0037] Step 2: The internal burr morphology of the high-frequency welded pipe weld is summarized into four types: well scraped, irregularly scraped, over-scraped, and under-scraped.

[0038] Step 3: High-frequency welded pipe welding involves continuously cold bending the strip steel to form a "V"-shaped meeting area at both edges. A high-frequency induced current is applied to this "V"-shaped area, causing Joule heat concentration at the edges under high-frequency induction or resistance. This heats the strip steel to melting point while applying a certain extrusion pressure, creating internal and external burrs on the weld seam. The internal burrs are monitored. The base frame 5 is placed on a stable table, and the high-frequency welded pipe is placed on top of the base frame 5. The telescopic cylinder 11 is activated, causing the rotating plate 10 to rotate within the rotating seat 9, bringing the lower end of the electromagnetic ultrasonic transducer 1 into contact with the high-frequency welded pipe. The motor 404 within the right-side fixed seat 401 of the vertical support plate 6 is activated, and the driving gear 405 and driven gear... Under the action of gear 406, power is transmitted to ball screw 402. Screw pair 403 drives moving plate 8 to move back and forth. Sliding block 12 connected to moving plate 8 slides in guide rail 7. The electromagnetic ultrasonic transducer 1 collects relevant information of internal burrs on the weld seam of high-frequency welded pipe in real time. The relevant information of internal burrs collected by electromagnetic ultrasonic transducer 1 on the weld seam of high-frequency welded pipe in real time includes height information and morphology information. The internal burrs of high-frequency welded pipe weld seam are quantitatively evaluated according to the morphology type of internal burrs. After pulse signal generator processor 2, the results are displayed on monitor 3 in B-type. The monitoring of external burrs is mainly through video. When the deviation between real-time image and standard image exceeds the set allowable deviation value, an alarm signal is given.

[0039] Example 2

[0040] Please see Figures 1-9 The present invention provides an embodiment of an automatic electromagnetic ultrasonic monitoring method for burrs inside high-frequency welded pipe welds, comprising the following steps:

[0041] Step 1: Design an electromagnetic ultrasonic transducer 1 that can generate longitudinal waves. The electromagnetic ultrasonic transducer 1 can generate different types of ultrasonic waves according to different combinations of excitation coils 103 and permanent magnets 102. The electromagnetic ultrasonic transducer 1 has a certain degree of fit with the surface of the steel pipe. The ultrasonic waves generated by the electromagnetic ultrasonic transducer 1 are SH waves. The external magnetic field of the electromagnetic ultrasonic transducer 1 is perpendicular to the current in the conductor, where j is the current in the conductor, B is the excitation magnetic field generated by the external magnetic field, Fm is the magnetizing force (ferromagnetic material), Fms is the magnetostrictive force (ferromagnetic material), and FL is the Lorentz force (electric conductor).

[0042] Step 2: The internal burr morphology of the high-frequency welded pipe weld is summarized into four types: well scraped, irregularly scraped, over-scraped, and under-scraped.

[0043] Step 3: High-frequency welded pipe welding involves continuously cold bending the strip steel to form a "V"-shaped meeting area at both edges. A high-frequency induced current is applied to this "V"-shaped area, causing Joule heat concentration at the edges under high-frequency induction or resistance. This heats the strip steel to melting point while applying a certain extrusion pressure, creating internal and external burrs on the weld seam. The internal burrs are monitored. The base frame 5 is placed on a stable table, and the high-frequency welded pipe is placed on top of the base frame 5. The telescopic cylinder 11 is activated, causing the rotating plate 10 to rotate within the rotating seat 9, bringing the lower end of the electromagnetic ultrasonic transducer 1 into contact with the high-frequency welded pipe. The motor 404 within the right-side fixed seat 401 of the vertical support plate 6 is activated, and the driving gear 405 and driven gear... Under the action of gear 406, power is transmitted to ball screw 402. Screw pair 403 drives moving plate 8 to move back and forth. Sliding block 12 connected to moving plate 8 slides in guide rail 7. The electromagnetic ultrasonic transducer 1 collects relevant information of internal burrs on the weld seam of high-frequency welded pipe in real time. The relevant information of internal burrs collected by electromagnetic ultrasonic transducer 1 on the weld seam of high-frequency welded pipe in real time includes height information and morphology information. The internal burrs of high-frequency welded pipe weld seam are quantitatively evaluated according to the morphology type of internal burrs. After pulse signal generator processor 2, the results are displayed on monitor 3 in B-type. The monitoring of external burrs is mainly through video. When the deviation between real-time image and standard image exceeds the set allowable deviation value, an alarm signal is given.

[0044] Example 3

[0045] Please see Figures 1-9 The present invention provides an embodiment of an automatic electromagnetic ultrasonic monitoring method for burrs inside high-frequency welded pipe welds, comprising the following steps:

[0046] Step 1: Design an electromagnetic ultrasonic transducer 1 that can generate longitudinal waves. The electromagnetic ultrasonic transducer 1 can generate different types of ultrasonic waves according to different combinations of excitation coils 103 and permanent magnets 102. The electromagnetic ultrasonic transducer 1 has a certain degree of fit with the surface of the steel pipe. The ultrasonic waves generated by the electromagnetic ultrasonic transducer 1 are SV waves. The external magnetic field of the electromagnetic ultrasonic transducer 1 is parallel to the current in the conductor, where j is the current in the conductor, B is the excitation magnetic field generated by the external magnetic field, Fm is the magnetizing force (ferromagnetic material), Fms is the magnetostrictive force (ferromagnetic material), and FL is the Lorentz force (electric conductor).

[0047] Step 2: The internal burr morphology of the high-frequency welded pipe weld is summarized into four types: well scraped, irregularly scraped, over-scraped, and under-scraped.

[0048] Step 3: High-frequency welded pipe welding involves continuously cold bending the strip steel to form a "V"-shaped meeting area at both edges. A high-frequency induced current is applied to this "V"-shaped area, causing Joule heat concentration at the edges under high-frequency induction or resistance. This heats the strip steel to melting point while applying a certain extrusion pressure, creating internal and external burrs on the weld seam. The internal burrs are monitored. The base frame 5 is placed on a stable table, and the high-frequency welded pipe is placed on top of the base frame 5. The telescopic cylinder 11 is activated, causing the rotating plate 10 to rotate within the rotating seat 9, bringing the lower end of the electromagnetic ultrasonic transducer 1 into contact with the high-frequency welded pipe. The motor 404 within the right-side fixed seat 401 of the vertical support plate 6 is activated, and the driving gear 405 and driven gear... Under the action of gear 406, power is transmitted to ball screw 402. Screw pair 403 drives moving plate 8 to move back and forth. Sliding block 12 connected to moving plate 8 slides in guide rail 7. The electromagnetic ultrasonic transducer 1 collects relevant information of internal burrs on the weld seam of high-frequency welded pipe in real time. The relevant information of internal burrs collected by electromagnetic ultrasonic transducer 1 on the weld seam of high-frequency welded pipe in real time includes height information and morphology information. The internal burrs of high-frequency welded pipe weld seam are quantitatively evaluated according to the morphology type of internal burrs. After pulse signal generator processor 2, the results are displayed on monitor 3 in B-type. The monitoring of external burrs is mainly through video. When the deviation between real-time image and standard image exceeds the set allowable deviation value, an alarm signal is given.

[0049] Through the above steps, the electromagnetic ultrasonic testing principle is used to automatically monitor the conditions of burr scraping, such as intact scraping, irregular scraping, excessive scraping, and insufficient scraping. Electromagnetic ultrasonic testing has the characteristics of non-contact testing, high-temperature monitoring, easy automation, fast testing speed, and high detection sensitivity. Therefore, it can better monitor the weld quality and the scraping of internal and external burrs in real time, thus solving the problem that the high temperature and fast production speed during online testing of high-frequency welded pipes are not conducive to real-time monitoring of weld quality and scraping of internal and external burrs.

[0050] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A method for automatic electromagnetic ultrasonic monitoring of burrs inside high-frequency welded pipe welds; characterized in that, Includes the following steps: Step 1: Design an electromagnetic ultrasonic transducer (1) that can generate longitudinal waves. The electromagnetic ultrasonic transducer (1) generates different types of ultrasonic waves according to different combinations of excitation coils (103) and permanent magnets (102). Step 2: The internal burr morphology of the high-frequency welded pipe weld is summarized into four types: well scraped, irregularly scraped, over-scraped, and under-scraped. Step 3: High-frequency welded pipe welding involves continuously cold bending the strip steel to form a "V" shaped meeting area on both edges. By applying a high-frequency induced current to the "V" shaped area, the Joule heat concentration formed at the edge of the "V" shaped area under the action of high-frequency induction or resistance causes the edge of the strip steel to be heated to melting while applying a certain extrusion force, forming burrs inside and outside the weld of the high-frequency welded pipe. The internal burrs are monitored, and relevant information of the internal burrs is collected in real time on the weld of the high-frequency welded pipe using an electromagnetic ultrasonic transducer (1). The internal burrs of the high-frequency welded pipe are quantitatively evaluated according to the morphology type of the internal burrs. After passing through a pulse signal generator (2), the results are displayed on the monitor (3).

2. The method for automatic electromagnetic ultrasonic monitoring of burrs in high-frequency welded pipe welds according to claim 1, characterized in that: The ultrasonic waves generated by the electromagnetic ultrasonic transducer (1) are longitudinal waves, SH waves and SV waves.

3. The method for automatic electromagnetic ultrasonic monitoring of burrs in high-frequency welded pipe welds according to claim 1, characterized in that: The electromagnetic ultrasonic transducer (1) has a certain degree of fit with the surface of the steel pipe.

4. The method for automatic electromagnetic ultrasonic monitoring of burrs in high-frequency welded pipe welds according to claim 1, characterized in that: The excitation mechanism of the electromagnetic ultrasonic transducer (1) is mainly Lorentz force. A high-frequency alternating current is passed through the excitation coil (103) to induce an alternating magnetic field on the metal surface, which in turn generates eddy currents on the surface of the specimen. The alternating eddy currents generate Lorentz force under the action of the magnetic field of the permanent magnet (102), causing the particles in the specimen to vibrate periodically. This vibration propagates in the specimen and eventually forms different types of ultrasonic waves. The principle of receiving sound waves is the reverse process mentioned above. When the material being tested has magnetic permeability, the material lattice will also be affected by magnetostrictive force and magnetization force. The magnetization intensity vector of the magnetic domains in the material will be affected by the external magnetic field and change. During the magnetization process, the boundary between the magnetic domains moves and produces mechanical deformation, which is the magnetostrictive effect. The magnetostrictive force, magnetization force and Lorentz force are coupled to each other, thereby strengthening the sound wave excitation effect.

5. The method for automatic electromagnetic ultrasonic monitoring of burrs in high-frequency welded pipe welds according to claim 1, characterized in that: The electromagnetic ultrasonic transducer (1) collects information related to internal burrs on the weld seam of high-frequency welded pipe in real time, including height information and morphology information.

6. The method and apparatus for automatic electromagnetic ultrasonic monitoring of burrs in high-frequency welded pipe welds according to claim 1, characterized in that: The pulse signal generator (2) displays the result in B-type on the monitor (3).

7. The method for automatic electromagnetic ultrasonic monitoring of burrs in high-frequency welded pipe welds according to claim 1, characterized in that: External burrs are mainly monitored through video. When the deviation between the real-time image and the standard image exceeds the set allowable deviation value, an alarm signal is given.

8. A high-frequency welded pipe weld seam internal burr electromagnetic ultrasonic automatic monitoring device, characterized in that... The method for automatic electromagnetic ultrasonic monitoring of burrs in welded pipes according to any one of claims 1-7 includes an electromagnetic ultrasonic transducer (1), a pulse signal generator (2), and a monitor (3); it also includes a base frame (5) and a reciprocating moving assembly for controlling the longitudinal movement of the electromagnetic ultrasonic transducer (1); the electromagnetic ultrasonic transducer (1) includes a housing (101); a permanent magnet (102) and an excitation coil (103) are installed inside the housing (101); a socket (104) is provided at the upper end of the housing (101); the electromagnetic ultrasonic transducer (1), the pulse signal generator (2), and the monitor (3) are electrically connected; the reciprocating moving assembly includes a fixed base (401); a ball screw (402) is rotatably connected inside the fixed base (401); a screw pair (403) is installed outside the ball screw (402); a motor (404) is installed inside the fixed base (401); the motor (404) output shaft An active gear (405) is installed on the outside; a driven gear (406) that meshes with the active gear (405) is installed on the outside of the ball screw (402); a vertical support plate (6) is fixedly connected to the upper left side of the base frame (5); a guide rail (7) is fixedly connected to the upper right side of the vertical support plate (6); a moving plate (8) is fixedly connected to the right end of the screw pair (403); a rotating seat (9) is fixedly connected to the right end of the moving plate (8); a rotating plate (10) is rotatably connected inside the rotating seat (9); an electromagnetic ultrasonic transducer (1) is fixedly connected to the front end of the rotating plate (10); a telescopic cylinder (11) is rotatably connected between the moving plate (8) and the rotating plate (10); a sliding block (12) that is fixedly connected to the moving plate (8) is slidably connected inside the guide rail (7); a fixed seat (401) is fixedly connected to the right end of the vertical support plate (6); a pulse signal generator (2) and a monitor (3) are both fixedly connected to the front end of the vertical support plate (6).

Images