CN113933381A - Pipeline stress internal detection method based on strong and weak magnetic detection method - Google Patents
Pipeline stress internal detection method based on strong and weak magnetic detection method Download PDFInfo
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- CN113933381A CN113933381A CN202111327805.3A CN202111327805A CN113933381A CN 113933381 A CN113933381 A CN 113933381A CN 202111327805 A CN202111327805 A CN 202111327805A CN 113933381 A CN113933381 A CN 113933381A
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- G01N27/83—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws by investigating stray magnetic fields
- G01N27/87—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws by investigating stray magnetic fields using probes
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/72—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables
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Abstract
The invention relates to the technical field of pipeline stress detection methods, in particular to a pipeline stress internal detection method based on a strong and weak magnetism detection method. According to the invention, the acquired strong magnetic signal and weak magnetic signal are subjected to ratio processing, so that the size of the pipeline crack and the lift-off value of the probe can be reduced, the stress damage degree of the pipeline can be accurately judged without being influenced by the change of the size of the crack and the lift-off value, and further the stress concentration area and the fatigue damage without forming a volume defect can be identified, so that the standard evaluation is carried out on the fatigue damage.
Description
Technical Field
The invention relates to the technical field of pipeline stress detection methods, in particular to a pipeline stress internal detection method based on a strong and weak magnetic detection method.
Background
Pipelines work under the action of repeated load for a long time, stress damage is often generated locally, some stress damage areas reach critical yield points or are subjected to plastic deformation, and the areas cause great hidden dangers for the safe use of components. The traditional nondestructive detection technology cannot detect the fatigue damage without forming the volume defect, and is difficult to make correct evaluation on the safety and the service life of the pipeline.
Magnetic flux leakage (strong magnetism) internal detection is currently applied in large scale in volume defect detection in the operation process of pipelines. The internal detection of the magnetic leakage has the advantages of strong detection capability, high reliability, good stability, high recognition rate, suitability for detection of the corrosion volume defect of the pipeline, and the like. But it is not sensitive to various weld defects such as cracks, slag inclusion, incomplete penetration and the like and stress concentration.
The weak magnetic detection technology utilizes the natural magnetomechanical relation of the stress concentration area to evaluate the stress state of the material, and can carry out early prejudgment and evaluation on the stress concentration area of the pipeline. However, weak magnetic detection signals are weak, are easily interfered by external signals, and are poor in signal stability, so that weak magnetic stress detection has great interference and uncertainty.
In order to ensure the safety of the pipeline operation, a new detection method which can accurately evaluate the stress concentration degree of the pipeline and has high stability is needed.
Disclosure of Invention
The invention provides a pipeline stress internal detection method based on a strong and weak magnetic detection method, overcomes the defects of the prior art, and solves the problem that the traditional nondestructive detection technology cannot detect fatigue damage without volume defects; the pipeline stress detection device combines magnetic leakage (strong magnetism) detection and weak magnetism detection to detect the pipeline stress, is not influenced by the size of a crack and the change of a lift-off value, and can accurately judge the stress damage degree of the pipeline.
The technical scheme of the invention is realized by the following measures: the method comprises the steps of respectively carrying out strong magnetism magnetization and weak magnetism magnetization treatment on a pipeline, collecting strong magnetism signals by adopting a strong magnetism detection probe in the magnetization process, collecting weak magnetism signals by adopting a weak magnetism detection probe, respectively carrying out filtering treatment on the collected strong magnetism signals and the collected weak magnetism signals, dividing the filtered strong magnetism signals and the filtered weak magnetism signals to obtain a ratio, and judging the stress damage degree of the pipeline according to the ratio.
The following is further optimization or/and improvement of the technical scheme of the invention:
when the ratio is more than 3.5, the pipeline has no stress defect; when the ratio is 2.0 to 3.5, the pipeline is indicated to be weak stress defect; when the ratio is less than 2.0, the pipeline is indicated to be in strong stress damage.
The electrified solenoid is adopted to generate a magnetic field, and the external magnetic field generated by the electrified solenoid is controlled by the power supply to respectively generate magnetic field environments of strong magnetic fields and weak magnetic fields.
The strong magnetic detection probe and the weak magnetic detection probe respectively adopt Hall sensors.
According to the invention, the acquired strong magnetic signal and weak magnetic signal are subjected to ratio processing, so that the size of the pipeline crack and the lift-off value of the probe can be reduced, the stress damage degree of the pipeline can be accurately judged without being influenced by the change of the size of the crack and the lift-off value, and further the stress concentration area and the fatigue damage without forming a volume defect can be identified, so that the standard evaluation is carried out on the fatigue damage.
Drawings
FIG. 1 is a logic block diagram of embodiment 5.
Detailed Description
The present invention is not limited by the following examples, and specific embodiments may be determined according to the technical solutions and practical situations of the present invention.
The invention is further described below with reference to the following examples:
example 1: the pipeline stress internal detection method based on the strong and weak magnetism detection method comprises the steps of respectively carrying out strong magnetism magnetization processing and weak magnetism magnetization processing on a pipeline, adopting a strong magnetism detection probe to collect strong magnetism signals in the magnetization process, adopting a weak magnetism detection probe to collect weak magnetism signals, respectively carrying out filtering processing on the collected strong magnetism signals and the collected weak magnetism signals, dividing the filtered strong magnetism signals and the filtered weak magnetism signals to obtain a ratio, and judging the stress damage degree of the pipeline according to the ratio.
When the pipeline stress internal detection method is adopted to detect the pipeline stress, the collected strong magnetic signals and weak magnetic signals are subjected to ratio processing, so that the size of the pipeline crack and the lift-off value of the probe (a strong magnetic detection probe and a weak magnetic detection probe) can be reduced (removed), the stress damage degree of the pipeline can be accurately judged without being influenced by the change of the size of the crack and the lift-off value, and further the stress concentration area and the fatigue damage without forming a volume defect can be identified, so that the pipeline stress internal detection method can be subjected to benchmark evaluation. Thereby making a correct assessment of the safety and service life of the pipeline.
The magnetization processing and the acquisition of the magnetic signals are all technical means well known in the art.
Example 2: as an optimization of the above embodiment, when the ratio is greater than 3.5, it indicates that the pipe has no stress defect; when the ratio is 2.0 to 3.5, the pipeline is indicated to be weak stress defect; when the ratio is less than 2.0, the pipeline is indicated to be in strong stress damage.
Example 3: in the optimization of the above embodiment, the energized solenoid is used to generate a magnetic field, and the external magnetic field generated by the energized solenoid is controlled by the power supply to generate magnetic field environments of strong magnetic field and weak magnetic field, respectively. The use of an energized solenoid to generate a magnetic field is known in the art.
Example 4: as the optimization of the above embodiment, the strong magnetism detection probe and the weak magnetism detection probe respectively adopt hall sensors.
The Hall sensor adopts a 49E type Hall sensor.
Example 5: as shown in fig. 1, the method for detecting the pipeline stress based on the strong and weak magnetic detection method specifically comprises the following steps:
firstly, performing strong magnetic magnetization treatment on a pipeline, starting a strong magnetic detection probe to collect a strong magnetic signal in the process of performing the strong magnetic magnetization treatment on the pipeline, putting the collected strong magnetic signal into an R1 register, and performing filtering treatment on strong magnetic signal data stored in the R1 register; secondly, carrying out weak magnetic magnetization treatment on the pipeline, starting a weak magnetic probe to collect weak magnetic signals in the process of carrying out the weak magnetic magnetization treatment on the pipeline, putting the collected weak magnetic signals into an R2 register, and carrying out filtering treatment on weak magnetic signal data stored in the R2 register; then, the strong magnetic signal data of the R1 register after filtering processing is divided by the weak magnetic signal data of the R2 register to obtain a ratio, and the ratio is put into the R3 register. Judging the stress damage degree of the pipeline according to the ratio, namely when the ratio is more than 3.5, indicating that the pipeline has no stress defect; when the ratio is 2.0 to 3.5, the pipeline is indicated to be weak stress defect; when the ratio is less than 2.0, the pipeline is indicated to be in strong stress damage. And storing the damage information and the corresponding coordinate position, and further completing the detection of the stress damage of the pipeline.
The method comprises the following steps of carrying out filtering processing on collected strong magnetic signal data (magnetic induction intensity data), wherein the filtering processing method comprises the following steps: determining the maximum deviation value A allowed by two times of sampling, and judging when a new value is detected each time: if the difference between the current value and the previous value is greater than A, the current value is invalid, the current value is abandoned, the previous value is used for replacing the current value, and interference signals are filtered; if the difference between the current value and the previous value is less than or equal to A, the current value is valid.
The technical characteristics form an embodiment of the invention, which has strong adaptability and implementation effect, and unnecessary technical characteristics can be increased or decreased according to actual needs to meet the requirements of different situations.
Claims (5)
1. The method is characterized by comprising the steps of respectively carrying out strong magnetic magnetization and weak magnetic magnetization on a pipeline, acquiring strong magnetic signals by adopting a strong magnetic detection probe in the magnetization process, acquiring weak magnetic signals by adopting a weak magnetic detection probe, respectively carrying out filtering processing on the acquired strong magnetic signals and the acquired weak magnetic signals, dividing the filtered strong magnetic signals and the filtered weak magnetic signals to obtain a ratio, and judging the stress damage degree of the pipeline according to the ratio.
2. The method for detecting the stress in the pipeline based on the strong and weak magnetic detection method according to claim 1, wherein when the ratio is more than 3.5, the pipeline is free of stress defects; when the ratio is 2.0 to 3.5, the pipeline is indicated to be weak stress defect; when the ratio is less than 2.0, the pipeline is indicated to be in strong stress damage.
3. The method for detecting the stress in the pipeline based on the strong and weak magnetic detection method according to claim 1 or 2, characterized in that an electrified solenoid is adopted to generate a magnetic field, and an external magnetic field generated by the electrified solenoid is controlled by a power supply to generate magnetic field environments of strong magnetic and weak magnetic external magnetic fields respectively.
4. The method for detecting the stress in the pipeline based on the strong and weak magnetic detection method according to claim 1 or 2, wherein the strong magnetic detection probe and the weak magnetic detection probe respectively adopt Hall sensors.
5. The method for detecting the stress in the pipeline based on the strong and weak magnetic detection method according to claim 3, wherein the strong magnetic detection probe and the weak magnetic detection probe respectively adopt Hall sensors.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114544043A (en) * | 2022-01-29 | 2022-05-27 | 中国石油大学(北京) | Multi-steel stress detection device and method |
| CN117571815A (en) * | 2023-11-15 | 2024-02-20 | 中磁数智(北京)科技有限公司 | Weak magnetic detection method for reserved branch pipe position of heat supply direct-buried pipeline |
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2021
- 2021-11-10 CN CN202111327805.3A patent/CN113933381A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114544043A (en) * | 2022-01-29 | 2022-05-27 | 中国石油大学(北京) | Multi-steel stress detection device and method |
| CN117571815A (en) * | 2023-11-15 | 2024-02-20 | 中磁数智(北京)科技有限公司 | Weak magnetic detection method for reserved branch pipe position of heat supply direct-buried pipeline |
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