CN117761150A - Method and equipment for detecting vortex of longitudinal groove pipe - Google Patents
Method and equipment for detecting vortex of longitudinal groove pipe Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 83
- 238000001514 detection method Methods 0.000 claims abstract description 198
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- 230000005294 ferromagnetic effect Effects 0.000 claims abstract description 39
- 239000002184 metal Substances 0.000 claims abstract description 19
- 229910052751 metal Inorganic materials 0.000 claims abstract description 19
- 230000035772 mutation Effects 0.000 claims abstract description 16
- 230000008439 repair process Effects 0.000 claims abstract description 10
- 238000012545 processing Methods 0.000 claims abstract description 9
- 238000012360 testing method Methods 0.000 claims description 23
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- 238000007689 inspection Methods 0.000 claims description 10
- 239000000463 material Substances 0.000 claims 4
- 230000035515 penetration Effects 0.000 abstract description 10
- 230000008569 process Effects 0.000 abstract description 3
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- 238000009833 condensation Methods 0.000 description 2
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- 238000012795 verification Methods 0.000 description 2
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910000881 Cu alloy Inorganic materials 0.000 description 1
- 229910000570 Cupronickel Inorganic materials 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
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- 229910052802 copper Inorganic materials 0.000 description 1
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- YOCUPQPZWBBYIX-UHFFFAOYSA-N copper nickel Chemical compound [Ni].[Cu] YOCUPQPZWBBYIX-UHFFFAOYSA-N 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
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Abstract
The invention relates to the technical field of eddy current detection, and particularly discloses a longitudinal groove pipe eddy current detection method and equipment. The method comprises the following steps: performing non-ferromagnetic metal pipe eddy current detection and on-use non-ferromagnetic heat exchange pipe eddy current detection on the longitudinal groove pipe to be detected; judging according to the detection standard, and determining the corresponding defect; judging whether an appearance mutation display signal exists in the irrelevant display signal after no defect exists; if yes, judging whether cracks exist at the shape mutation part; processing the scratch depth exceeding a preset depth according to the scrapped products, and processing the rest according to repairable products; PT detection is carried out on the repairable product at the relevant display position, the defect property and the defect position are determined, then repair is carried out, and permeation rechecking and vortex rechecking are carried out; and outputting qualified products as qualified products according to the results of the permeation rechecking and the vortex rechecking, and processing unqualified products as scrapped products. The method adopts an internal and external penetration detection process, so that the display characteristics of the vortex in the external penetration detection can be analyzed.
Description
Technical Field
The invention relates to the technical field of eddy current detection, in particular to a method and equipment for detecting an eddy current of a longitudinal groove pipe.
Background
At present, large-scale domestic chemical enterprises, including petrochemical industry and coal chemical industry, commonly use high-flux longitudinal groove pipes in the process of separating low-carbon olefins. The longitudinal groove tube has good heat exchange effect in boiling heat exchange and condensation heat transfer, wherein the boiling heat transfer coefficient of the porous surface reaches more than ten times of the light pipe, and the condensation heat transfer of the longitudinal groove reaches three to four times of the light pipe.
However, the existing detection flow of the longitudinal groove pipe to be detected has obvious defects. When the conventional nondestructive testing method is used for testing the longitudinal groove pipe to be tested, the testing flow cannot be normally performed due to the fact that the testing result cannot be accurately evaluated.
Therefore, a detection method specific to the longitudinal groove tube to be detected is needed to ensure the smooth proceeding of the whole detection process and obtain a good detection effect.
Disclosure of Invention
The invention aims to provide a method and equipment for detecting the eddy current of a longitudinal groove pipe, which are used for detecting the longitudinal groove pipe to be detected by using the eddy current, and have good detection effect.
To achieve the purpose, the invention adopts the following technical scheme:
the method for detecting the vortex of the longitudinal groove pipe is used for detecting the longitudinal groove pipe to be detected and comprises the following steps of:
s10: performing non-ferromagnetic metal pipe eddy current detection on the longitudinal groove pipe to be detected to obtain corresponding relevant display signals and non-relevant display signals;
s20: judging whether a non-relevant display signal without determining the defect exists, if yes, performing S30, and if not, performing S40;
s30: judging according to the detection standard according to the generation reason of the irrelevant display signals, determining the corresponding defect, and returning to S20;
s40: judging whether an appearance mutation display signal exists in the non-relevant display signals, if so, performing S50, otherwise, outputting information that no appearance mutation exists, and then performing S60;
s50: judging whether cracks exist at the shape mutation part, if so, outputting information of the existence of the cracks, then performing S60, otherwise, outputting information of the absence of the cracks, and then performing S60;
s60: analyzing the related display signals, determining the depth of the flaw according to the corresponding flaw depth map, judging whether the depth exceeds the preset depth, if so, processing according to the scrapped product, if not, processing according to the repairable product, and then performing S70;
s70: PT detection is carried out on the repairable product at the relevant display position, the defect property and the defect position are determined, then repair is carried out, and after repair is completed, permeation rechecking and vortex rechecking are carried out;
s80: judging whether the restoration is qualified according to the results of the permeation re-inspection and the vortex re-inspection, if so, performing S90, and if not, performing treatment according to the scrapped product;
s90: and judging whether the in-use non-ferromagnetic heat exchange tube vortex detection of the to-be-detected longitudinal groove tube is finished, if so, generating detection records and reports, outputting the to-be-detected longitudinal groove tube as a qualified product, if not, performing in-use non-ferromagnetic heat exchange tube vortex detection of the to-be-detected longitudinal groove tube, acquiring corresponding relevant display signals and non-relevant display signals, and returning to S20.
As a preferable technical scheme of the longitudinal groove pipe vortex detection method, when the longitudinal groove pipe to be detected is subjected to non-ferromagnetic metal pipe vortex detection and/or when the non-ferromagnetic heat exchange pipe vortex detection is used, the method comprises a detection frequency debugging method, wherein the detection frequency debugging method comprises the following steps of: starting up the longitudinal groove pipe vortex detection equipment to preheat for a preset time; switching the longitudinal groove pipe eddy current detection equipment to a near-surface and single-frequency application mode; closing a filter of the longitudinal groove pipe vortex detection equipment; zeroing the detected phase angle; deducing the minimum detection frequency of the detection sample tube, and setting 1/2 of the detection frequency as the initial detection frequency; enabling the detection sample tube to slowly and stably pass through the detection coil of the vertical groove tube vortex detection device, and simultaneously checking vortex meter display of the vertical groove tube vortex detection device to judge whether through hole defect display exists; if no hole defect is displayed, repeating the previous step with the minimum amplitude increasing frequency until the through hole defect is found to be displayed; continuing to increase the frequency with the minimum amplitude after the through hole defect display is found, so that the phase angle of the through hole defect display is close to horizontal; and taking out the detection sample tube, and taking the detection frequency at the moment as the optimal detection frequency.
As a preferable technical scheme of the vertical groove pipe vortex detection method, the preset time is 10min.
As a preferable technical scheme of the longitudinal groove pipe vortex detection method, when the longitudinal groove pipe to be detected is subjected to non-ferromagnetic metal pipe vortex detection and/or when the non-ferromagnetic heat exchange pipe vortex detection is used, the method comprises a filter debugging method, and the filter debugging method comprises the following steps of: starting up the longitudinal groove pipe vortex detection equipment to preheat for the preset time; switching the longitudinal groove pipe eddy current detection equipment to a near-surface and single-frequency application mode; closing the filter; zeroing the detected phase angle; determining the optimal detection frequency according to the debugging method of the detection frequency; enabling the detection sample tube to slowly and stably pass through the detection coil, checking the display of the vortex meter at the same time, and judging whether the through hole defect display is easy to identify and has minimum noise; if the through hole defect display is not easy to identify and has large noise, modulating the filter, setting the high pass of the filter to be the initial frequency of 2Hz, and increasing the low pass of the filter from 10Hz according to the amplitude of 5Hz until the through hole defect display is easy to identify; if the noise cannot be minimized at this time, increasing the high pass of the filter from 2Hz according to the amplitude of 1Hz until the through hole defect is easily identified and the noise is minimized; and taking out the detection sample tube, and finishing the debugging of the filter.
As a preferable technical scheme of the vertical groove pipe vortex detection method, the preset time is 10min.
As a preferable technical scheme of the longitudinal groove pipe vortex detection method, when the longitudinal groove pipe to be detected is subjected to non-ferromagnetic metal pipe vortex detection and/or when the non-ferromagnetic heat exchange pipe vortex detection is used, the method comprises a phase angle debugging method, and the phase angle debugging method comprises the following steps: debugging the longitudinal groove pipe eddy current testing equipment by using the debugging method of the testing frequency and the debugging method of the filter; setting the phase angle displayed by the through hole defect to be a preset angle; sequentially passing through natural defects with other depths, and selecting the most accepted defect depth as a standard depth; if the phase angle of the most accepted defect is the predetermined angle, other debugging can be omitted; and if the phase angle of the most accepted defect is not the preset angle, readjusting the phase angle according to the standard hole parameter until the phase angle of the most accepted defect is the preset angle.
As a preferable technical scheme of the vertical groove pipe vortex detection method, when the vertical groove pipe to be detected is subjected to non-ferromagnetic metal pipe vortex detection and/or when the non-ferromagnetic heat exchange pipe vortex detection is used, the method comprises a manual deep injury map manufacturing method, and the manual deep injury map manufacturing method comprises the following steps of: debugging the longitudinal groove pipe eddy current testing equipment by using the debugging method of the testing frequency and the debugging method of the filter; setting a phase angle displayed by the through hole defect to the predetermined angle; sequentially passing through natural defects of other depths, and recording corresponding phase angles; dividing the display range of the phase angle according to the depth direction of the artificial defect; and drawing a damage depth map of the detection sample tube.
As a preferable technical scheme of the vertical groove pipe vortex detecting method, the predetermined angle is 40 degrees.
As a preferable technical scheme of the vertical groove pipe vortex detection method, the predetermined depth is 1mm.
The longitudinal groove pipe vortex detection equipment is applied to the longitudinal groove pipe vortex detection method and comprises a detection coil, an vortex meter and a filter.
The invention has the beneficial effects that:
according to the method for detecting the eddy current of the longitudinal groove pipe, the eddy current of the non-ferromagnetic metal pipe is detected and the eddy current of the non-ferromagnetic heat exchange pipe is detected sequentially on the longitudinal groove pipe to be detected, so that the result of the two detection can be obtained, and the display signals of the detection result are divided into related display signals, non-related display signals and pseudo display signals. Wherein the pseudo display does not have to be recorded and assessed. And judging the irrelevant display signals according to the detection standard, and determining all the defects, wherein the steps are helpful for confirming the reasons of the defects, so that the defects cannot become interference factors of detection results, thereby improving the efficiency of eddy current detection and ensuring the accuracy of the detection results. By judging whether the appearance mutation display signal exists or not and further judging whether a crack exists at the appearance mutation position, the appearance of the longitudinal groove pipe to be detected can be accurately detected, and the position of defect detection generated in the manufacturing process of the longitudinal groove pipe can be determined. According to the corresponding injury depth map, the depth of the injury is determined, and whether the to-be-detected longitudinal groove pipe is repaired or not is judged according to the injury depth map, so that the purpose of evaluating the injury depth is achieved, unqualified products can be removed timely, the yield of the to-be-detected longitudinal groove pipe is improved through a repairing means, and the manufacturing cost of the to-be-detected longitudinal groove pipe is effectively reduced. And the property and the position of the defect can be determined by carrying out PT detection operation on the repairable longitudinal groove pipe to be detected. The method combines the permeation rechecking operation and the vortex rechecking operation after repair, achieves the aim of detecting the repair effect, and distinguishes the qualified products and the unqualified products in the longitudinal groove pipe to be detected again. The method for detecting the vortex of the longitudinal groove pipe adopts the vortex detection technology to detect the longitudinal groove pipe to be detected, determines the internal and external penetration detection technology, is convenient for analyzing the characteristics of the vortex display signals of the external penetration detection, can achieve good detection effect, and can also analyze the conclusion that the external penetration is better than the internal penetration so as to sum up the typical display signals of the vortex of the longitudinal groove pipe to be detected. By adopting the steps, the defect detection generated in the manufacturing process of the longitudinal groove pipe to be detected can be detected, so that the eddy current detection operation of the longitudinal groove pipe to be detected is completed, and the optimization of a detection scheme is realized.
According to the longitudinal groove pipe vortex detection equipment, the detection requirements of the longitudinal groove pipe vortex detection method can be met by arranging the detection coil, the vortex meter and the filter, smooth completion of the vortex detection operation of the longitudinal groove pipe to be detected is ensured, the workload of operators is reduced, and the efficiency of vortex detection is further improved.
Drawings
Fig. 1 is a flowchart of a method for detecting a vertical tube vortex according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the invention are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Wherein the terms "first location" and "second location" are two distinct locations and wherein the first feature is "above," "over" and "over" the second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is level above the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the invention.
As shown in fig. 1, the present embodiment provides a method for detecting a vertical groove pipe eddy current, which is used for detecting a vertical groove pipe to be detected, and the method for detecting a vertical groove pipe eddy current includes the following steps:
step one: and carrying out non-ferromagnetic metal pipe eddy current detection on the longitudinal groove pipe to be detected, and obtaining corresponding relevant display signals and non-relevant display signals.
Step two: judging whether a non-relevant display signal without determining the defect exists, if yes, performing the third step, and if not, performing the fourth step.
Step three: and (3) judging according to the detection standard according to the generation reason of the uncorrelated display signal, determining the corresponding defect, and returning to the step two.
Step four: judging whether an appearance mutation display signal exists in the non-relevant display signals, if so, performing a step five, otherwise, outputting information that no appearance mutation exists, and then performing a step six.
Step five: judging whether the appearance mutation part has a crack, if so, outputting information of the crack, then carrying out the step six, otherwise, outputting information of no crack, and then carrying out the step six.
Step six: analyzing the related display signals, determining the depth of the flaw according to the corresponding flaw depth map, judging whether the depth exceeds the preset depth, if so, processing according to the scrapped product, if not, processing according to the repairable product, and then performing the step seven.
Step seven: and (3) carrying out PT detection on the repairable product at the relevant display position, determining the defect property and position, repairing, and carrying out permeation rechecking and vortex rechecking after the repair is completed.
Step eight: judging whether the restoration is qualified according to the results of the permeation re-inspection and the vortex re-inspection, if so, performing a step nine, and if not, performing treatment according to the scrapped product.
Step nine: judging whether the to-be-detected longitudinal groove pipe is subjected to eddy current detection of the non-ferromagnetic heat exchange pipe, if so, generating detection records and reports, outputting the to-be-detected longitudinal groove pipe as a qualified product, if not, performing eddy current detection of the to-be-detected longitudinal groove pipe by the non-ferromagnetic heat exchange pipe, acquiring corresponding relevant display signals and non-relevant display signals, and returning to the step two. Specifically, the predetermined depth is 1mm.
According to the method for detecting the eddy current of the longitudinal groove pipe, the eddy current of the non-ferromagnetic metal pipe is detected and the eddy current of the non-ferromagnetic heat exchange pipe is detected sequentially on the longitudinal groove pipe to be detected, so that the result of the two detection can be obtained, and the display signals of the detection result are divided into related display signals, non-related display signals and pseudo display signals. Wherein the pseudo display does not have to be recorded and assessed. And judging the irrelevant display signals according to the detection standard, and determining all the defects, wherein the steps are helpful for confirming the reasons of the defects, so that the defects cannot become interference factors of detection results, thereby improving the efficiency of eddy current detection and ensuring the accuracy of the detection results. By judging whether the appearance mutation display signal exists or not and further judging whether a crack exists at the appearance mutation position, the appearance of the longitudinal groove pipe to be detected can be accurately detected, and the position of defect detection generated in the manufacturing process of the longitudinal groove pipe can be determined. According to the corresponding injury depth map, the depth of the injury is determined, and whether the to-be-detected longitudinal groove pipe is repaired or not is judged according to the injury depth map, so that the purpose of evaluating the injury depth is achieved, unqualified products can be removed timely, the yield of the to-be-detected longitudinal groove pipe is improved through a repairing means, and the manufacturing cost of the to-be-detected longitudinal groove pipe is effectively reduced. And the property and the position of the defect can be determined by carrying out PT detection operation on the repairable longitudinal groove pipe to be detected. The method combines the permeation rechecking operation and the vortex rechecking operation after repair, achieves the aim of detecting the repair effect, and distinguishes the qualified products and the unqualified products in the longitudinal groove pipe to be detected again. The method for detecting the vortex of the longitudinal groove pipe adopts the vortex detection technology to detect the longitudinal groove pipe to be detected, determines the internal and external penetration detection technology, is convenient for analyzing the characteristics of the vortex display signals of the external penetration detection, can achieve good detection effect, and can also analyze the conclusion that the external penetration is better than the internal penetration so as to sum up the typical display signals of the vortex of the longitudinal groove pipe to be detected. By adopting the steps, the defect detection generated in the manufacturing process of the longitudinal groove pipe to be detected can be detected, so that the eddy current detection operation of the longitudinal groove pipe to be detected is completed, and the optimization of a detection scheme is realized.
GB/T12604.6 and NB/T47013.1 define the following terms and definitions apply to this embodiment: the related display signal is a signal (also called a defect signal) generated by a detector during the detection of the longitudinal groove pipe; the uncorrelated display signal refers to a signal formed by an internal and external structure which is irrelevant to defects; the pseudo display signal is a signal caused by the adhesion of other metal impurities on the inner and outer surfaces of the longitudinal groove pipe. Assessment refers to the analysis of the observed detection-related signals to determine the cause of such signals and their classification.
In this embodiment, the relevant display signals include a crack display and a fold display; the uncorrelated display signals comprise appearance mutation display, staggered tooth display, scratch display, indentation display, coating defect display and the like; the pseudo display signals include lift-off effect display, tube conductivity non-uniformity display, tube permeability non-uniformity display, and tube noise display.
The following documents are essential to the application of the present embodiment: standard logarithmic visual chart [ GB11533 ], copper and copper alloy seamless tube eddy current inspection method [ GB/T5248 ], part 3 in nondestructive inspection eddy current inspection apparatus: system performance and inspection [ GB/T14480.3 ], part 1 of a method for measuring artificial defect size of a steel pipe flaw detection comparison sample [ YB/T145 ] and nondestructive detection of pressure-bearing equipment: general requirements [ NB/T47013.1 ]. Where the reference file is dated, only the dated version is applicable to the present embodiment. Where the reference file is not dated, its latest version (including all of the modifiers) is applicable to this embodiment.
In this embodiment, the longitudinal groove tube to be measured is a copper-nickel longitudinal groove tube. In other implementations of this embodiment, the longitudinal groove pipe to be tested is a carbon steel longitudinal groove pipe.
In this embodiment, when the non-ferromagnetic metal pipe eddy current detection is performed on the longitudinal groove pipe to be detected and/or when the non-ferromagnetic heat exchange pipe eddy current detection is used, the method includes a method for debugging detection frequency, and the method for debugging detection frequency includes the following steps: starting up the longitudinal groove pipe vortex detection equipment to preheat for a preset time; switching the longitudinal groove pipe vortex detection equipment to a near-surface and single-frequency application mode; closing a filter of the longitudinal groove pipe vortex detection equipment; zeroing the detected phase angle; deducing the minimum detection frequency of the detection sample tube, and setting 1/2 of the detection frequency as the initial detection frequency; enabling the detection sample tube to slowly and stably pass through the detection coil of the longitudinal groove tube vortex detection device, and simultaneously checking vortex meter display of the longitudinal groove tube vortex detection device to judge whether through hole defect display exists; if the imperforate defect is displayed, the frequency is increased by the minimum amplitude, and the previous step is repeated until the defect of the through hole is displayed; after the through hole defect display is found, the frequency is increased continuously with the minimum amplitude, so that the phase angle of the through hole defect display is close to the horizontal; and taking out the detection sample tube, and setting the detection frequency at the time as the optimal detection frequency.
The debugging method of the detection frequency can carry out the debugging operation of the optimal frequency during the eddy current detection, and the test equipment selects a detection sample tube which is determined by the negotiation of relevant technical specifications and standard requirements and owners. The method has the advantages of simple and reliable steps, high operation stability and good debugging effect, and is favorable for quickly determining the optimal frequency so as to ensure the smooth progress of the longitudinal groove pipe vortex detection method.
When the filter of the detection device is turned off, a specific operation mode is to switch the high pass of the filter to the off mode and switch the low pass of the filter to the broadband mode.
Illustratively, when the non-ferromagnetic metal pipe vortex detection is carried out on the longitudinal groove pipe to be detected and/or the non-ferromagnetic heat exchange pipe vortex detection is carried out, the method for debugging the filter is included, and the method for debugging the filter comprises the following steps: starting up the longitudinal groove pipe vortex detection equipment to preheat for a preset time; switching the longitudinal groove pipe vortex detection equipment to a near-surface and single-frequency application mode; closing the filter; zeroing the detected phase angle; determining the optimal detection frequency according to a debugging method of the detection frequency; enabling the detection tube to slowly and stably pass through the detection coil, checking vortex meter display at the same time, and judging whether through hole defect display is easy to identify and has minimum noise; if the through hole defect display is not easy to identify and the noise is large, modulating the filter, setting the high pass of the filter to be the initial frequency of 2Hz, and increasing the low pass of the filter from 10Hz to 5Hz in sequence until the through hole defect display is easy to identify; if the noise cannot be minimized at this time, increasing the high pass of the filter from 2Hz according to the amplitude of 1Hz until the through hole defect display is easy to identify and the noise is minimized; and taking out the detection sample tube, and finishing the debugging of the filter. Specifically, the predetermined time is 10 minutes.
Wherein the debugging operation of the filter cannot be ended before the noise is not debugged to a minimum, because the noise may seriously affect the through hole defect display identification.
The method for debugging the filter can be used for debugging the filter during eddy current detection, and test equipment selects a detection sample tube which is determined by negotiation between related technical specifications and standard requirements and owners. The method has the advantages of simple and reliable steps, high operation stability and good debugging effect, and is beneficial to rapidly debugging the filter so as to ensure the smooth progress of the vertical groove pipe vortex detection method.
The judgment of the through hole defect display can be carried out according to the curve displayed by the vortex meter, and when the curve displayed by the vortex meter is smooth, the through hole defect display is easy to identify and has small noise.
In this embodiment, the difficulty in identifying the defect display of the through hole and the noise level are determined by the above-mentioned documents, and the defect display of the through hole is easy to identify and the noise is minimal, and the determination method is the conventional one disclosed in the above-mentioned documents, and the specific determination basis is common knowledge in the art, and is known by the person skilled in the art, and will not be repeated here.
In this embodiment, when the non-ferromagnetic metal pipe eddy current detection is performed on the longitudinal groove pipe to be detected and/or when the non-ferromagnetic heat exchange pipe eddy current detection is used, the method for adjusting the phase angle is included, and the method for adjusting the phase angle includes the following steps: debugging the longitudinal groove pipe eddy current testing equipment by using a debugging method of the detection frequency and a debugging method of the filter; setting a phase angle displayed by the through hole defect to a predetermined angle; sequentially passing through natural defects with other depths, and selecting the most accepted defect depth as a standard depth; if the phase angle of the most accepted defect is a predetermined angle, no other debugging can be performed; and if the phase angle of the most accepted defect is not the preset angle, readjusting the phase angle according to the standard hole parameters until the phase angle of the most accepted defect is the preset angle.
The phase angle debugging method can be applied to calibrating the eddy current testing instrument, and the testing equipment selects the testing sample tube which is the same as the longitudinal groove tube to be tested. The depth of the artificial defect is determined according to related technical specifications and standard requirements or by negotiating with a proprietor, and the detection sample tube is provided with an artificial defect, and the defect is subjected to depth verification by using a measuring tool and a standard hole is determined. The method has the advantages of simple and reliable steps, high operation stability and good debugging effect, and is beneficial to rapid debugging of the phase angle so as to ensure the smooth progress of the vertical groove pipe vortex detection method.
In this embodiment, the concept and the judgment method of the phase angle of the most accepted defect are the conventional one disclosed in the above cited document, and the specific judgment is based on the common knowledge in the art, and is well known by the person skilled in the art, and the details are not repeated here.
Illustratively, when the non-ferromagnetic metal pipe vortex detection is carried out on the longitudinal groove pipe to be detected and/or the non-ferromagnetic heat exchange pipe vortex detection is carried out, the method for manually manufacturing the injury depth map comprises the following steps of: debugging the longitudinal groove pipe eddy current testing equipment by using a debugging method of the detection frequency and a debugging method of the filter; setting a phase angle displayed by the through hole defect to a predetermined angle; sequentially passing through natural defects of other depths, and recording corresponding phase angles; dividing the display range of the phase angle according to the depth direction of the artificial defect; and drawing a injury depth map of the detection sample tube. Specifically, the predetermined angle is 40 °.
And when the through hole defect display is easy to identify and the noise is minimum, judging that the debugging of the detection frequency of the vertical slot tube eddy current detection equipment and the debugging of the filter are finished.
The manual manufacturing method of the injury depth map is used for providing the injury depth map during eddy current detection evaluation, and test equipment selects a detection sample tube which is the same as the longitudinal groove tube to be detected. The depth of the artificial defect is determined according to related technical specifications and standard requirements or by negotiating with a proprietor, and the detection sample tube is provided with an artificial defect, and the defect is subjected to depth verification by using a measuring tool.
The embodiment also provides a longitudinal groove pipe vortex detection device which is applied to the longitudinal groove pipe vortex detection method and comprises a detection coil, an vortex meter and a filter.
According to the longitudinal groove pipe vortex detection equipment, the detection requirements of the longitudinal groove pipe vortex detection method can be met by arranging the detection coil, the vortex meter and the filter, smooth completion of the vortex detection operation of the longitudinal groove pipe to be detected is ensured, the workload of operators is reduced, and the efficiency of vortex detection is further improved.
It is to be understood that the above examples of the present invention are provided for clarity of illustration only and are not limiting of the embodiments of the present invention. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the invention are desired to be protected by the following claims.
Claims (10)
1. The method for detecting the longitudinal groove pipe vortex is used for detecting the longitudinal groove pipe to be detected and is characterized by comprising the following steps of:
s10: performing non-ferromagnetic metal pipe eddy current detection on the longitudinal groove pipe to be detected to obtain corresponding relevant display signals and non-relevant display signals;
s20: judging whether a non-relevant display signal without determining the defect exists, if yes, performing S30, and if not, performing S40;
s30: judging according to the detection standard according to the generation reason of the irrelevant display signals, determining the corresponding defect, and returning to S20;
s40: judging whether an appearance mutation display signal exists in the non-relevant display signals, if so, performing S50, otherwise, outputting information that no appearance mutation exists, and then performing S60;
s50: judging whether cracks exist at the shape mutation part, if so, outputting information of the existence of the cracks, then performing S60, otherwise, outputting information of the absence of the cracks, and then performing S60;
s60: analyzing the related display signals, determining the depth of the flaw according to the corresponding flaw depth map, judging whether the depth exceeds the preset depth, if so, processing according to the scrapped product, if not, processing according to the repairable product, and then performing S70;
s70: PT detection is carried out on the repairable product at the relevant display position, the defect property and the defect position are determined, then repair is carried out, and after repair is completed, permeation rechecking and vortex rechecking are carried out;
s80: judging whether the restoration is qualified according to the results of the permeation re-inspection and the vortex re-inspection, if so, performing S90, and if not, performing treatment according to the scrapped product;
s90: and judging whether the in-use non-ferromagnetic heat exchange tube vortex detection of the to-be-detected longitudinal groove tube is finished, if so, generating detection records and reports, outputting the to-be-detected longitudinal groove tube as a qualified product, if not, performing in-use non-ferromagnetic heat exchange tube vortex detection of the to-be-detected longitudinal groove tube, acquiring corresponding relevant display signals and non-relevant display signals, and returning to S20.
2. The method for detecting the vortex of the longitudinal groove pipe according to claim 1, wherein the method for detecting the vortex of the non-ferromagnetic metal pipe material and/or detecting the vortex of the non-ferromagnetic heat exchange pipe for the longitudinal groove pipe to be detected comprises a method for debugging the detection frequency, and the method for debugging the detection frequency comprises the following steps:
starting up the longitudinal groove pipe vortex detection equipment to preheat for a preset time; switching the longitudinal groove pipe eddy current detection equipment to a near-surface and single-frequency application mode; closing a filter of the longitudinal groove pipe vortex detection equipment; zeroing the detected phase angle; deducing the minimum detection frequency of the detection sample tube, and setting 1/2 of the detection frequency as the initial detection frequency; enabling the detection sample tube to slowly and stably pass through the detection coil of the vertical groove tube vortex detection device, and simultaneously checking vortex meter display of the vertical groove tube vortex detection device to judge whether through hole defect display exists; if no hole defect is displayed, repeating the previous step with the minimum amplitude increasing frequency until the through hole defect is found to be displayed; continuing to increase the frequency with the minimum amplitude after the through hole defect display is found, so that the phase angle of the through hole defect display is close to horizontal; and taking out the detection sample tube, and taking the detection frequency at the moment as the optimal detection frequency.
3. The method of detecting a vertical tube vortex according to claim 2, wherein the predetermined time is 10min.
4. The method for detecting the vortex of the longitudinal groove pipe according to claim 2, wherein the method for debugging the filter is included in the detection of the vortex of the non-ferromagnetic metal pipe material of the longitudinal groove pipe to be detected and/or the detection of the vortex of the non-ferromagnetic heat exchange pipe, and comprises the following steps:
starting up the longitudinal groove pipe vortex detection equipment to preheat for the preset time; switching the longitudinal groove pipe eddy current detection equipment to a near-surface and single-frequency application mode; closing the filter; zeroing the detected phase angle; determining the optimal detection frequency according to the debugging method of the detection frequency; enabling the detection sample tube to slowly and stably pass through the detection coil, checking the display of the vortex meter at the same time, and judging whether the through hole defect display is easy to identify and has minimum noise; if the through hole defect display is not easy to identify and has large noise, modulating the filter, setting the high pass of the filter to be the initial frequency of 2Hz, and increasing the low pass of the filter from 10Hz according to the amplitude of 5Hz until the through hole defect display is easy to identify; if the noise cannot be minimized at this time, increasing the high pass of the filter from 2Hz according to the amplitude of 1Hz until the through hole defect is easily identified and the noise is minimized; and taking out the detection sample tube, and finishing the debugging of the filter.
5. The method for detecting a vertical tube vortex according to claim 4, wherein the predetermined time is 10min.
6. The method for detecting the vortex of the longitudinal groove pipe according to claim 4, wherein the method for detecting the vortex of the non-ferromagnetic metal pipe material of the longitudinal groove pipe to be detected and/or detecting the vortex of the non-ferromagnetic heat exchange pipe comprises a phase angle adjusting method, and the phase angle adjusting method comprises the following steps:
debugging the longitudinal groove pipe eddy current testing equipment by using the debugging method of the testing frequency and the debugging method of the filter; setting the phase angle displayed by the through hole defect to be a preset angle; sequentially passing through natural defects with other depths, and selecting the most accepted defect depth as a standard depth; if the phase angle of the most accepted defect is the predetermined angle, other debugging can be omitted; and if the phase angle of the most accepted defect is not the preset angle, readjusting the phase angle according to the standard hole parameter until the phase angle of the most accepted defect is the preset angle.
7. The method for detecting the vortex flow of the longitudinal groove pipe according to claim 6, wherein the method for detecting the vortex flow of the non-ferromagnetic metal pipe material and/or the vortex flow of the non-ferromagnetic heat exchange pipe for detecting the vortex flow of the longitudinal groove pipe to be detected comprises a manual method for manufacturing a flaw depth map, and the manual method for manufacturing the flaw depth map comprises the following steps:
debugging the longitudinal groove pipe eddy current testing equipment by using the debugging method of the testing frequency and the debugging method of the filter; setting a phase angle displayed by the through hole defect to the predetermined angle; sequentially passing through natural defects of other depths, and recording corresponding phase angles; dividing the display range of the phase angle according to the depth direction of the artificial defect; and drawing a damage depth map of the detection sample tube.
8. The method of detecting a vertical tube vortex as set forth in claim 6 or 7 wherein the predetermined angle is 40 °.
9. The method of detecting a vertical tube vortex as set forth in claim 1 wherein the predetermined depth is 1mm.
10. A longitudinal groove pipe eddy current testing apparatus, applied to the longitudinal groove pipe eddy current testing method as claimed in any one of claims 1 to 9, characterized in that the longitudinal groove pipe eddy current testing apparatus comprises a testing coil, an eddy current meter and a filter.
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| CN202311788965.7A CN117761150A (en) | 2023-12-25 | 2023-12-25 | Method and equipment for detecting vortex of longitudinal groove pipe |
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| CN202311788965.7A CN117761150A (en) | 2023-12-25 | 2023-12-25 | Method and equipment for detecting vortex of longitudinal groove pipe |
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