CN113884566A - Positioning method of pipeline welding seam - Google Patents
Positioning method of pipeline welding seam Download PDFInfo
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- 238000003466 welding Methods 0.000 title claims abstract description 33
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- 238000009412 basement excavation Methods 0.000 abstract description 7
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- 238000005516 engineering process Methods 0.000 description 9
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
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- 238000003199 nucleic acid amplification method Methods 0.000 description 4
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- 230000008901 benefit Effects 0.000 description 2
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- 239000003345 natural gas Substances 0.000 description 2
- 239000003209 petroleum derivative Substances 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
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- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910000889 permalloy Inorganic materials 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
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- 229920006395 saturated elastomer Polymers 0.000 description 1
- 238000007619 statistical method Methods 0.000 description 1
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Abstract
The application discloses a method for positioning a pipeline welding seam, and belongs to the field of safety risk management and control of oil and gas pipelines. The method comprises the steps of obtaining a first magnetic signal and a second magnetic signal of a plurality of time points, wherein a measuring device of the first magnetic signal is positioned above a measuring device of the second magnetic signal; carrying out differential calculation on the first magnetic signal and the second magnetic signal at each same time point, and fitting to obtain a magnetic signal curve to be researched; amplifying the magnetic signal curve to be researched by a preset multiple to obtain an amplified magnetic signal curve to be researched; and responding to the amplified magnetic signal curve to be researched, wherein only one peak appears in a preset magnetic signal intensity range with a preset length, and the position shown by the peak is the position of the pipeline welding seam. The method can realize accurate positioning of the pipeline welding seam, is convenient for detecting or determining the subsequent targeted pipeline excavation, and saves the detection cost.
Description
Technical Field
The application relates to the field of safety risk management and control of oil and gas pipelines, in particular to a positioning method of a pipeline welding seam.
Background
With the rapid development of national economy, the national demand for energy sources is increasing, so that it is important to explore an economic and effective way for conveying petroleum and natural gas. At present, the petroleum and natural gas are generally accepted as economic transportation modes by laying pipelines. However, as the pipeline laying time goes on, it is necessary to perform excavation detection after positioning the circumferential weld position of the pipeline at intervals, or, since lawless persons seek to punch holes and steal oil on the pipeline privately, it is necessary to perform excavation confirmation after positioning the weld position of the oil card of the pipeline.
In the related art, the corrosion defect condition of the pipeline is usually detected by performing external detection or internal detection on the pipeline by using detection technologies such as ultrasonic, magnetic leakage, eddy current and the like. However, when the corrosion defect condition of the pipeline is detected externally in the related technology, the pipeline needs to be close to or contact with the pipeline, so that the pipeline needs to be excavated and then detected, the one-time detection length is limited, and the detection cost is high; when the corrosion defect condition of the pipeline is detected internally, the pipeline is required to have certain running pressure and flow, the pipeline which does not meet the conditions cannot be detected, and the pipeline detection cannot be carried out at any time.
Disclosure of Invention
In view of the above, the application provides a method for positioning a pipeline weld joint, so as to accurately position the pipeline weld joint, facilitate subsequent targeted pipeline excavation for detection or determination, and save detection cost.
Specifically, the method comprises the following technical scheme:
a method of positioning a pipe weld, the method comprising:
acquiring first magnetic signals and second magnetic signals of a plurality of time points, wherein an acquisition device of the first magnetic signals is positioned above an acquisition device of the second magnetic signals;
performing differential calculation on the first magnetic signal and the second magnetic signal at each same time point, and fitting to obtain a magnetic signal curve to be researched;
amplifying the magnetic signal curve to be researched by a preset multiple to obtain an amplified magnetic signal curve to be researched;
and responding to the amplified magnetic signal curve to be researched, wherein only one wave peak appears in a preset magnetic signal intensity range with a preset length, and the position shown by the wave peak is the position of the pipeline welding seam.
In one possible design, the measurement device for the first magnetic signal is the same as the measurement device for the second magnetic signal, and both are fluxgate sensor probes.
In one possible design, the fluxgate sensor probe is a three-axis fluxgate sensor probe and the resolution of the fluxgate sensor probe is 0.002 nT.
In one possible design, the detection range of the fluxgate sensor probe is a range of 1.5-9 m away from the fluxgate sensor probe in the vertical direction.
In one possible design, the number of the plurality of time points is determined according to the length of the pipeline to be measured and the acquisition frequency of the fluxgate sensor probe.
In one possible design, the value range of the acquisition frequency is 20-100 Hz.
In one possible design, the preset multiple is 5-20 times.
In one possible design, the predetermined length is at least 2 m.
In one possible design, the predetermined magnetic signal strength range is greater than or equal to 2000nT and less than or equal to 100000 nT.
In one possible design, the method further includes:
acquiring third magnetic signals and fourth magnetic signals of the plurality of time points, wherein the measuring device of the third magnetic signals and the measuring device of the fourth magnetic signals are positioned on two sides of a central shaft of the measuring device of the first magnetic signals or the measuring device of the second magnetic signals;
performing difference calculation on the third magnetic signal and the fourth magnetic signal at each same time point, and fitting to obtain a comparison magnetic signal curve;
amplifying the comparison magnetic signal curve by the preset times to obtain an amplified comparison magnetic signal curve;
and comparing the amplified comparison magnetic signal curve with the amplified magnetic signal curve to be researched, and determining the position of the pipeline welding seam.
The technical scheme provided by the embodiment of the application has the beneficial effects that at least:
obtaining magnetic signals of an upper magnetic signal measuring device and a lower magnetic signal measuring device at a plurality of time points, carrying out differential calculation on the two magnetic signals at each same time point, and fitting to obtain a magnetic signal curve to be researched; in order to facilitate observation of the magnetic signal curve, amplifying the magnetic signal curve to be researched by a preset multiple to obtain an amplified magnetic signal curve to be researched; the amplified magnetic signal curve to be researched only has one wave crest within the preset magnetic signal intensity range with the preset length, and the position shown by the wave crest is the position of the pipeline welding seam, so that the pipeline welding seam can be accurately positioned, the subsequent targeted excavation of the pipeline can be conveniently detected or determined, and the detection cost is saved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a flowchart of a method for positioning a weld of a pipeline according to an embodiment of the present disclosure;
FIG. 2 is a flow chart of another method for positioning a weld of a pipe according to an embodiment of the present disclosure;
FIG. 3 is a schematic structural diagram of a pipeline weld joint detection apparatus according to an embodiment of the present disclosure;
FIG. 4 is a schematic structural diagram of another pipeline weld joint detection device provided in the embodiments of the present application;
FIG. 5 is a schematic structural diagram of another pipeline weld joint detection apparatus provided in the embodiments of the present application;
FIG. 6 is a flowchart of a positioning method for a circumferential weld of a pipe according to an embodiment of the present disclosure;
fig. 7 is a flowchart of a positioning method for punching and stealing an oil card when a pipeline weld joint is provided in the embodiment of the present application.
With the above figures, there are shown specific embodiments of the present application, which will be described in more detail below. These drawings and written description are not intended to limit the scope of the inventive concepts in any manner, but rather to illustrate the inventive concepts to those skilled in the art by reference to specific embodiments.
Detailed Description
Before the embodiments of the present application are described in further detail, the terms of orientation in the embodiments of the present application, such as "above", are used only for clearly describing the pipe weld detecting apparatus and the positioning method of the pipe weld in the embodiments of the present application, with reference to the orientation shown in fig. 2 or 3, and are not intended to limit the scope of the present application. Unless defined otherwise, all technical terms used in the examples of the present application have the same meaning as commonly understood by one of ordinary skill in the art.
In order to make the technical solutions and advantages of the present application clearer, the following will describe the embodiments of the present application in further detail with reference to the accompanying drawings.
With the development of oil and gas pipeline construction, the mileage of oil and gas long-distance pipelines in China exceeds 12 km, and the method plays an increasingly important role in the development of national economy and society. Because the pipeline mileage is long, the area of the passing region is wide, the related region types are complex, some pipelines run for decades and enter the stage with multiple accidents, and some pipelines are easy to be utilized by lawless persons, and the oil stealing is realized by punching holes on the pipelines and welding conveying pipes, so that the private benefit is obtained. According to the accident statistical analysis of domestic pipelines, the stress cracking of the pipeline girth weld defects and the damage of oil stealing by punching by a third party are two main factors influencing the safe operation of the pipelines. Because the oil card department and the circumferential weld department of stealing of punching are the welding seam structure, consequently, through effectively detecting the location to the welding seam structure, can steal oil point and circumferential weld position for looking for the pipeline and punch and facilitate to further excavate and speedily carry out rescue work, maintain the operation safety of pipeline.
However, at present, no positioning technology for pipeline welding seams exists, and similar to the positioning technology, the positioning technology is an internal detection technology and an external detection technology aiming at pipeline defects. In the related art, the corrosion defect condition of the pipeline is generally detected by performing external detection or internal detection on the pipeline by using detection technologies such as ultrasonic, magnetic leakage, eddy current and the like. The external detection technology needs to be close to or contact with a pipeline, so that the pipeline needs to be excavated and then detected, the one-time detection length is limited, and the detection cost is high; interior detection technical requirement pipeline has certain operating pressure and flow, just can't realize detecting the pipeline that does not satisfy the condition, detects twice in simultaneously and need the interval period of several years between, can not develop the pipeline inspection at any time, consequently can not satisfy the demand of pipeline safety completely, has some pipeline sections in addition because the bore is little, the distance is short, do not possess the condition of receiving and dispatching a ball, can't carry out conventional in the pipeline and detect.
In order to solve the problems in the related art, the embodiment of the application provides a method for positioning a pipeline welding seam. Referring to fig. 1, the method includes:
And 102, performing differential calculation on the first magnetic signal and the second magnetic signal at each same time point, and fitting to obtain a magnetic signal curve to be researched.
And 103, amplifying the magnetic signal curve to be researched by a preset multiple to obtain the amplified magnetic signal curve to be researched.
And 104, responding to the amplified magnetic signal curve to be researched, wherein only one peak appears in a preset magnetic signal intensity range with a preset length, and the position shown by the peak is the position of the pipeline welding seam.
The measuring device of the first magnetic signal is the same as the measuring device of the second magnetic signal, and the measuring devices are all fluxgate sensor probes.
The fluxgate sensor probe is a triaxial fluxgate sensor probe, and the resolution of the fluxgate sensor probe is 0.002 nT.
The detection range of the fluxgate sensor probe is a range which is 1.5-9 m away from the fluxgate sensor probe along the vertical direction.
The number of the plurality of time points is determined according to the length of the pipeline to be detected and the acquisition frequency of the fluxgate sensor probe.
Wherein the sampling frequency ranges from 20 Hz to 100 Hz.
Wherein the preset multiple is 5-20 times.
Wherein the preset length is at least 2 m.
Wherein the preset magnetic signal intensity range is greater than or equal to 2000nT and less than or equal to 100000 nT.
Wherein, the method further comprises:
acquiring third magnetic signals and fourth magnetic signals of a plurality of time points, wherein the measuring device of the third magnetic signals and the measuring device of the fourth magnetic signals are positioned on two sides of a central shaft of the measuring device of the first magnetic signals or the measuring device of the second magnetic signals;
carrying out differential calculation on the third magnetic signal and the fourth magnetic signal at each same time point, and fitting to obtain a comparison magnetic signal curve;
amplifying the comparison magnetic signal curve by a preset multiple to obtain an amplified comparison magnetic signal curve;
and comparing the amplified comparison magnetic signal curve with the amplified magnetic signal curve to be researched to determine the position of the pipeline welding seam.
All the above optional technical solutions may be combined arbitrarily to form optional embodiments of the present application, and are not described herein again.
According to the method for positioning the pipeline welding seam, magnetic signals of an upper magnetic signal measuring device and a lower magnetic signal measuring device at a plurality of time points are obtained, difference calculation is carried out on the two magnetic signals of each same time point, and a magnetic signal curve to be researched is obtained through fitting; in order to facilitate observation of the magnetic signal curve, amplifying the magnetic signal curve to be researched by a preset multiple to obtain an amplified magnetic signal curve to be researched; the amplified magnetic signal curve to be researched only has one wave crest within the preset magnetic signal intensity range with the preset length, and the position shown by the wave crest is the position of the pipeline welding seam, so that the pipeline welding seam can be accurately positioned, the subsequent targeted excavation of the pipeline can be conveniently detected or determined, and the detection cost is saved.
Fig. 2 is a flowchart of a method for positioning a pipe weld according to an embodiment of the present disclosure. The method comprises steps 201 to 208. The steps of the method are described in detail below:
In order to acquire the first magnetic signal and the second magnetic signal, the inspector is required to walk on the pipeline ground with the pipeline weld inspection device. Fig. 3 is a schematic structural diagram of a pipeline weld joint detection device. Referring to fig. 3, the first magnetic signal measuring device a1 and the second magnetic signal measuring device a2 are located on the pipeline weld detecting apparatus, the first magnetic signal measuring device a1 and the second magnetic signal measuring device a2 are connected by a bracket B, and the first magnetic signal measuring device a1 is located above the second magnetic signal measuring device a 2.
Optionally, the bracket B is an all-aluminum bracket.
Optionally, the measuring device a1 for the first magnetic signal and the measuring device a2 for the second magnetic signal are the same and are both fluxgate sensor probes.
The fluxgate sensor is a sensor for measuring a weak magnetic field by utilizing the nonlinear relation between the magnetic induction intensity and the magnetic signal intensity of a high-permeability iron core in a measured magnetic field under the saturation excitation of an alternating magnetic field. Compared with other types of magnetic measuring instruments, the fluxgate sensor has the characteristics of high resolution, wide and reliable weak magnetic field measurement range, capability of directly measuring the component of the magnetic field, suitability for use in a fast moving system and the like.
The working principle of the fluxgate sensor is based on the nonlinear magnetization characteristic of an iron core material, a sensitive element of the fluxgate sensor is an iron core made of a high-permeability and easily-saturated material, and the iron core is surrounded by two windings: one is an excitation coil and the other is a signal coil. Under the magnetization of the alternating excitation signal, the magnetic permeability of the iron core changes periodically between saturation and non-saturation, so that the induction coil surrounding the iron core induces a signal which is in response to an external magnetic field.
Optionally, the fluxgate sensor probe is a triaxial fluxgate sensor probe. Wherein, triaxial fluxgate sensor probe has three orthogonal measuring coils, constitutes three measuring axes: an X-axis, a Y-axis, and a Z-axis. In the center of the three measuring coils, there is a permalloy core, which is common to the three measuring coils. Three measuring coils and the magnetic core form a three-axis fluxgate sensor probe, and can measure three components of a magnetic field at one point in space: an X-axis component, a Y-axis component, and a Z-axis component.
Optionally, the resolution of the fluxgate sensor probe is 0.002 nT.
Optionally, the detection range of the fluxgate sensor probe is a range 1.5-9 m away from the fluxgate sensor probe along the vertical direction. It is understood that the pipeline may be laid in the river bed or at the gully of the river, and the fluxgate sensor probe should have a large detection range in order to facilitate the surveying staff to hold the pipeline weld detecting device to position the pipeline weld.
Optionally, the number of the plurality of time points is determined according to the length of the pipeline to be measured and the acquisition frequency of the fluxgate sensor probe. The magnetic signal acquired by the fluxgate sensor probe is a discontinuous signal and has a certain acquisition frequency, and the acquisition result seen by human eyes is continuous, so that the human eyes cannot distinguish the gap between two acquisition points due to the high acquisition frequency.
Optionally, the sampling frequency ranges from 20 Hz to 100 Hz. Preferably, the acquisition frequency is 25 Hz.
And 202, performing differential calculation on the first magnetic signal and the second magnetic signal at each same time point, and fitting to obtain a magnetic signal curve to be researched.
Wherein the first magnetic signal and the second magnetic signal at each same time point are subjected to a differential calculation to eliminate ambient noise (background noise).
Here, the difference calculation is embodied as subtracting the second magnetic signal value from the first magnetic signal value.
And 203, amplifying the magnetic signal curve to be researched by a preset multiple to obtain the amplified magnetic signal curve to be researched.
In order to more clearly display the magnetic signal curve to be studied, the magnetic signal curve to be studied is amplified by a preset factor before being studied.
Optionally, the preset multiple is 5-20 times. Preferably, the preset multiple is 10 times.
And 204, responding to the amplified magnetic signal curve to be researched, wherein only one peak appears in a preset magnetic signal intensity range with a preset length, and the position shown by the peak is the position of the pipeline welding seam.
Wherein the preset length is at least 2m, preferably 2 m. It will be understood that the length of the pipe to be measured is constituted by a succession of preset lengths.
Wherein the preset magnetic signal intensity range is greater than or equal to 2000nT and less than or equal to 100000 nT. The values 2000nT and 100000nT are summarized by field probing experience. That is, when the magnetic signal intensity is less than 2000nT or greater than 100000nT, the magnetic signal intensity is an invalid magnetic signal, which cannot be used as a basis for determining the position of the pipe weld, and the signal needs to be filtered.
It should be noted that, when only one peak appears in the amplified magnetic signal curve to be studied in the preset magnetic signal intensity range of the preset length, the position shown by the peak is the position of the pipeline weld, and when a plurality of peaks (for example, three peaks) or no peaks appear in the amplified magnetic signal curve to be studied in the preset magnetic signal intensity range of the preset length, it indicates that the pipeline weld does not exist in the preset length.
For example, when three peaks appear in the amplified magnetic signal curve to be studied in the preset magnetic signal intensity range of the preset length, it indicates that there is a bent pipe or a flange or other structures in the preset length.
On the basis of the above steps, in order to verify the accuracy of the result, the method for positioning the pipeline weld seam provided by the embodiment of the application further includes the following steps:
In order to acquire the third magnetic signal and the fourth magnetic signal, a third magnetic signal measuring device A3 and a fourth magnetic signal measuring device a4 may be further disposed on the pipe weld detecting apparatus. Fig. 4 or fig. 5 is a schematic structural diagram of a pipeline weld joint detection device. Referring to fig. 4 or 5, the third magnetic signal measuring device A3 and the fourth magnetic signal measuring device a4 are located on the pipeline weld detecting apparatus together with the first magnetic signal measuring device a1 and the second magnetic signal measuring device a2, and the third magnetic signal measuring device A3 and the fourth magnetic signal measuring device a4 are located on both sides of the central axis of the first magnetic signal measuring device a1 or the second magnetic signal measuring device a2, respectively, and are connected by a bracket B.
Referring to fig. 4, the third magnetic signal sensing device A3 and the fourth magnetic signal sensing device a4 may be symmetrically disposed at both sides of the first magnetic signal sensing device a1, and the center of the first magnetic signal sensing device a1, the center of the third magnetic signal sensing device A3, and the center of the fourth magnetic signal sensing device a4 may be located on the same plane.
Referring to fig. 5, the third magnetic signal measuring device A3 and the fourth magnetic signal measuring device a4 are symmetrically disposed at both sides of a point between the first magnetic signal measuring device a1 and the second magnetic signal measuring device a 2.
The structure of the pipe weld detecting device may also have other structural forms, and is not limited to the structure shown in fig. 4 or fig. 5, and is not limited specifically herein.
In addition, as will be understood by those skilled in the art, the pipe weld detecting apparatus may further include more measuring devices for magnetic signals, but from the economical and practical viewpoints, the pipe weld detecting apparatus may be provided with at most four measuring devices for magnetic signals.
And step 206, performing difference calculation on the third magnetic signal and the fourth magnetic signal at each same time point, and fitting to obtain a contrast magnetic signal curve.
Here, the difference calculation method may be the same as the difference calculation method in step 202.
And step 207, amplifying the contrast magnetic signal curve by a preset multiple to obtain an amplified contrast magnetic signal curve.
The preset multiple may be the same as the preset multiple in step 203, which facilitates comparison.
And 208, comparing the amplified comparison magnetic signal curve with the amplified magnetic signal curve to be researched, and determining the position of the pipeline welding seam.
Responding to the fact that the contrast magnetic signal curve after contrast and amplification and the magnetic signal curve to be researched after amplification are within the same preset length, the magnetic signal intensity is within the preset magnetic signal intensity range, and only one wave peak appears in the magnetic signal intensity, and then the position shown by the wave peak is proved to be the position where the pipeline welding seam is located.
Responding to the fact that the contrast magnetic signal curve after contrast and amplification and the magnetic signal curve to be researched after amplification are within the same preset length, the magnetic signal intensity is within the preset magnetic signal intensity range, but more than one wave peak appears in the magnetic signal intensity, and proving that the position shown by the wave peak is not necessarily the position of the pipeline welding seam.
According to the method for positioning the pipeline welding seam, magnetic signals of an upper magnetic signal measuring device and a lower magnetic signal measuring device at a plurality of time points are obtained, difference calculation is carried out on the two magnetic signals of each same time point, and a magnetic signal curve to be researched is obtained through fitting; in order to facilitate observation of the magnetic signal curve, amplifying the magnetic signal curve to be researched by a preset multiple to obtain an amplified magnetic signal curve to be researched; the amplified magnetic signal curve to be researched only has one wave crest within the preset magnetic signal intensity range with the preset length, and the position shown by the wave crest is the position of the pipeline welding seam, so that the pipeline welding seam can be accurately positioned, the subsequent targeted excavation of the pipeline can be conveniently detected or determined, and the detection cost is saved.
Example one
When the circumferential weld of the pipeline is subjected to safety detection, the position of the circumferential weld needs to be determined, the positioning method of the pipeline welding provided by the application can be utilized, the pipeline welding detection device shown in fig. 3 can be utilized, the flow chart of the method is shown in fig. 6, and the specific steps comprise:
The length of the pipeline to be measured can be 2km, and the acquisition frequency of the fluxgate sensor probe is 25 Hz.
And step 602, performing difference calculation on the first magnetic signal and the second magnetic signal at each same time point, and fitting to obtain a magnetic signal curve to be researched.
And step 604, responding to that the amplified magnetic signal curve to be researched is within the range of 2m, presetting the magnetic signal intensity range to be more than or equal to 2000nT and less than or equal to 100000nT, and only generating one peak, wherein the position shown by the peak is the position of the girth weld of the pipeline.
Example two
When the punching oil stealing card of the pipeline is subjected to safety detection, the position of the punching oil stealing card is required to be determined, the pipeline welding seam detection device shown in FIG. 3 can be utilized by utilizing the positioning method of the pipeline welding seam provided by the application, the flow chart of the method is shown in FIG. 7, and the specific steps comprise:
The length of the pipeline to be measured can be 2km, and the acquisition frequency of the fluxgate sensor probe is 25 Hz.
And step 702, performing differential calculation on the first magnetic signal and the second magnetic signal at each same time point, and fitting to obtain a magnetic signal curve to be researched.
And 703, amplifying the magnetic signal curve to be researched by 10 times to obtain the amplified magnetic signal curve to be researched.
In this application, the terms "first," "second," "third," and "fourth" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. The term "plurality" means two or more unless expressly limited otherwise.
The above description is only for facilitating the understanding of the technical solutions of the present application by those skilled in the art, and is not intended to limit the present application. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (10)
1. A method of positioning a pipe weld, the method comprising:
acquiring first magnetic signals and second magnetic signals of a plurality of time points, wherein an acquisition device of the first magnetic signals is positioned above an acquisition device of the second magnetic signals;
performing differential calculation on the first magnetic signal and the second magnetic signal at each same time point, and fitting to obtain a magnetic signal curve to be researched;
amplifying the magnetic signal curve to be researched by a preset multiple to obtain an amplified magnetic signal curve to be researched;
and responding to the amplified magnetic signal curve to be researched, wherein only one wave peak appears in a preset magnetic signal intensity range with a preset length, and the position shown by the wave peak is the position of the pipeline welding seam.
2. The method according to claim 1, wherein the means for acquiring the first magnetic signal is the same as the means for acquiring the second magnetic signal and is a fluxgate sensor probe.
3. The method of claim 2, wherein the fluxgate sensor probe is a three-axis fluxgate sensor probe and the resolution of the fluxgate sensor probe is 0.002 nT.
4. The method for positioning the pipe weld according to claim 2, wherein the detection range of the fluxgate sensor probe is a range of 1.5-9 m away from the fluxgate sensor probe in the vertical direction.
5. The method for positioning the pipe weld according to claim 2, wherein the number of the plurality of time points is determined according to the length of the pipe to be measured and the acquisition frequency of the fluxgate sensor probe.
6. The method for positioning the pipeline weld joint according to claim 5, wherein the sampling frequency is in a range of 20-100 Hz.
7. The method for positioning the pipe weld according to any one of claims 1 to 6, wherein the preset multiple is 5 to 20 times.
8. The method of positioning a pipe weld according to any one of claims 1 to 6, wherein the predetermined length is at least 2 m.
9. The method for positioning a pipe weld according to any one of claims 1 to 6, wherein the preset magnetic signal intensity range is 2000nT or more and 100000nT or less.
10. The method of positioning a pipe weld according to claim 1, further comprising:
acquiring third magnetic signals and fourth magnetic signals of the plurality of time points, wherein the measuring device of the third magnetic signals and the measuring device of the fourth magnetic signals are positioned on two sides of a central shaft of the measuring device of the first magnetic signals or the measuring device of the second magnetic signals;
performing difference calculation on the third magnetic signal and the fourth magnetic signal at each same time point, and fitting to obtain a comparison magnetic signal curve;
amplifying the comparison magnetic signal curve by the preset times to obtain an amplified comparison magnetic signal curve;
and comparing the amplified comparison magnetic signal curve with the amplified magnetic signal curve to be researched, and determining the position of the pipeline welding seam.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010622114.5A CN113884566B (en) | 2020-07-01 | 2020-07-01 | Positioning method for pipeline welding seam |
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