CN114324578A - Ferrite steel container sheet butt weld phased array ultrasonic detection method - Google Patents
Ferrite steel container sheet butt weld phased array ultrasonic detection method Download PDFInfo
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Abstract
The invention provides a phased array ultrasonic detection method for a butt weld of a ferritic steel container sheet, which adopts a single-line array self-focusing type phased array ultrasonic probe, wherein the frequency is 5-7.5 MHz, the number of probe wafers is 16-32, and the active aperture is 8-10 mm. The invention adopts a phased array ultrasonic detection method to improve the lower limit of the applicable thickness of ultrasonic detection of the butt weld of the ferritic steel container sheet from 10mm to 6 mm. The comprehensive verification method of combination of artificial simulation defects and real defects of products and phased array ultrasonic detection and ray detection contrast tests is adopted, so that the defect detection rate of the phased array ultrasonic detection technology is improved. The invention uses double probes to symmetrically arrange and simultaneously detect on the two sides of the single side of the welding line, thereby improving the reliability of defect detection and display evaluation. The invention determines the main technical parameters of the phased array ultrasonic detection method of the butt weld of the 6-10 mm ferrite steel container sheet based on the test result, and simultaneously sets the corresponding acceptance standard, thereby realizing the detection effect equivalent to the ray detection.
Description
Technical Field
The invention relates to the technical field of weld joint detection, in particular to a phased array ultrasonic detection method for a butt weld joint of a ferritic steel container sheet.
Background
The ultrasonic detection generally has high detection rate on area type defects, the ray detection generally has high detection rate on volume type defects, and both methods are main detection methods for realizing the internal quality detection of welding seams during the construction and service of a nuclear power station. Due to the influences of the factors such as the arrangement and the structural characteristics of the factory building of the nuclear power station, radiation protection requirements, the limitation of the intensity of a ray source, the limitation of a ray detection operation time window and the like, the long-term overstock of the ray detection workload is caused, and the ray detection becomes a main influence factor which restricts the construction progress and the overhaul period. Particularly, in recent years, with the requirement of fine management of nuclear power plants, construction and overhaul periods of the nuclear power plants need to be further optimized so as to improve economy, and it becomes a new normal state that radiation operation is performed simultaneously by multiple units or multiple groups. However, on-site ray detection is mutually restricted, radiation safety risk is large, ray detection management is strict, ray operation coordination interfaces are numerous, on-site safety protection consumes time and labor, and the utilization rate of a detection time window and the detection efficiency are relatively low compared with ultrasonic detection. The conventional ultrasonic detection technology and the Time of Flight Diffraction (TOFD) ultrasonic detection technology can meet the detection requirement of a welding line with the thickness of more than or equal to 10mm, but no engineering feasible solution is provided for ultrasonic detection of the butt welding line of the ferritic steel container thin plate, so that the development of a detection technology suitable for detecting the internal defects of the butt welding line of the ferritic steel container thin plate (6-10 mm) is urgently needed.
The phased array ultrasonic detection technology is an ultrasonic detection technology which excites independent piezoelectric wafers (array elements) of a phased array probe to synthesize sound beams according to a set delay rule, realizes the functions of scanning, deflecting, focusing and the like of the sound beams, receives ultrasonic signals according to a certain delay rule and displays the internal state of an object to be detected in an image mode. By utilizing the scanning characteristic, the scanning of the detection area can be realized under the condition of not moving the probe; by utilizing the deflection characteristic, the scanning of the detection area can be realized under the condition of not moving the probe, and the large-range scanning coverage of the detection area can be realized by adopting the multi-angle sound beam, so that the detection efficiency and the detection rate of defects are improved; by utilizing the focusing characteristic, the sound field intensity, the reflection amplitude and the signal to noise ratio can be improved, so that the defect detection rate and the measurement accuracy of the depth and the length of the defect are improved. The phased array ultrasonic detection system is a high-performance digitizer, can realize the recording of defect display in the detection process, and can generate high-quality display images projected in different directions by processing the defect display, such as A scanning imaging, C scanning imaging, S scanning imaging and the like. Compared with the conventional ultrasonic detection and diffraction time difference method ultrasonic detection technologies, the phased array ultrasonic detection technology has the advantages that the detection result can be subjected to multi-view imaging, defects can be conveniently identified and judged, the scanning of sound beams in all directions of a detection object can be flexibly controlled to realize the detection of workpieces with complex structures, the sound beams can be controlled to be focused in the detection area to obtain high detection sensitivity and resolution in a large range, the detection data can be recorded in real time, the advantages of good traceability and the like are achieved, and the phased array ultrasonic detection technology is one of the most advanced new technologies in the conventional ultrasonic detection technology.
Due to technical characteristics and advantages, the phased array ultrasonic detection technology is widely applied to the nondestructive detection field of the conventional thermal power industry, the petrochemical industry and other industries, and has a good application effect, but the phased array ultrasonic detection method for the butt weld of the 6-10 mm thin plate of the ferritic steel container has less research, does not realize engineering application, and needs further research.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art.
The invention aims to provide a phased array ultrasonic detection method for a butt weld of a ferritic steel container sheet, and provides a brand-new and reliable detection method for detecting internal defects of the butt weld of the ferritic steel container sheet.
The embodiment of the application provides a ferrite steel container sheet butt weld phased array ultrasonic detection method, which comprises the following steps: the method comprises the following steps of respectively accessing a single-line array self-focusing phased array ultrasonic probe into an ultrasonic phased array instrument and a scanning device, inputting a weld joint structure of a to-be-detected weld joint to be scanned into the ultrasonic phased array instrument, setting the single-line array self-focusing phased array ultrasonic probe to be full-wafer excitation, and scanning in a sector scanning mode; and scanning along the line by adopting double probes symmetrically arranged on two sides of the single side of the welding line, generating an A scanning signal diagram, an S scanning signal diagram and a C scanning signal diagram by using an ultrasonic phased array instrument, observing a defect signal, and measuring the length of the defect.
In some embodiments, the frequency of the single-line array self-focusing phased array ultrasonic probe is 5-7.5 MHz, the number of probe wafers is 16-32, and the active aperture is 8-10 mm.
In some embodiments, the scan angle ranges from 45 ° to 75 °, and the fan scan beam angle increment is a maximum of 1 °.
In some embodiments, the focusing rule of the single-linear-array self-focusing phased array ultrasonic probe is set as follows: and 2-order waves and 3-order waves are adopted to carry out inspection on two sides of a single side of a welding line, the 2-order waves and the 3-order waves are separately arranged, the focusing depth is arranged at the maximum detection sound path, the defects close to the upper surface are scanned by the 2-order waves, and the defects close to the lower surface are scanned by the 3-order waves.
In some embodiments, the front end of the probe is 6-10 mm from the center line of the weld seam during scanning.
In some embodiments, the defect length measurement is measured using the-6 dB method.
In some embodiments, the recording criteria are: when the reflection amplitude is more than or equal to phi 2mm-24dB, evaluation and recording are carried out; the acceptance criteria are: the defects that the reflection amplitude is more than or equal to phi 2-15dB or the indication length is more than or equal to 5mm are unqualified.
In some embodiments, before proceeding to step S1, the probe type and its parameters are determined by:
s1, basic characteristics of butt welding seams of the carded ferrite steel container thin plates: the method comprises the following steps of (1) primarily determining an adopted quasi-probe to be a single-line array self-focusing phased array ultrasonic probe according to basic characteristics of a welding material, a welding process, a joint type, a welding seam surplus height condition and a reachable condition, and determining the frequency, the number of probe chips and an active aperture of the quasi-probe;
s2, performing CIVA simulation on the detected workpiece and the quasi-use probe, and analyzing the matching property of the quasi-use probe and the detected workpiece;
s3, collecting and analyzing typical welding defects of the butt welding seam of the ferritic steel container thin plate, and processing a series of test plates with artificial simulation defects by referring to the size limit value in the ray detection acceptance standard;
and S4, inputting the size information of the welding seam into an ultrasonic phased array instrument, scanning on a test board by using a phased array ultrasonic probe, observing an A scanning signal diagram, an S scanning signal diagram and a C scanning signal diagram, judging whether the defect can be found or not, and determining main technical parameters on the basis.
In some embodiments, the matching in step S2 includes probe parameter sensitivity analysis, detection region sound field and sound beam coverage analysis, focusing rule, and typical defect reflection amplitude response analysis.
In some embodiments, in step S4, the main technical parameters include probe parameters, focusing rules, scanning mode, detection sensitivity, recording and acceptance criteria.
The invention has the beneficial effects that: the phased array ultrasonic detection method for the butt weld of the thin plates of the ferritic steel containers is researched and developed for the first time, the acceptance standard is established, a brand-new and reliable detection means is provided for detecting the internal defects of the butt weld of the thin plates of the ferritic steel containers, the technical problem that the internal defects of the butt weld of the thin plates of the ferritic steel containers can be detected on a single surface is solved, and the quality of the weld is ensured.
Compared with the prior art, the invention has the following advantages:
1. the invention adopts a phased array ultrasonic detection method to improve the lower limit of the applicable thickness of ultrasonic detection of the butt weld of the ferritic steel container sheet from 10mm to 6 mm.
2. The comprehensive verification method of combination of artificial simulation defects and real defects of products and phased array ultrasonic detection and ray detection contrast tests is adopted, so that the defect detection rate of the phased array ultrasonic detection technology is improved.
3. The invention uses double probes to symmetrically arrange and simultaneously detect on the two sides of the single side of the welding line, thereby improving the reliability of defect detection and display evaluation.
4. The invention determines the main technical parameters of the phased array ultrasonic detection method of the butt weld of the 6-10 mm ferrite steel container sheet based on the test result, and simultaneously sets the corresponding acceptance standard, thereby realizing the detection effect equivalent to the ray detection.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Detailed Description
The following detailed description of embodiments of the invention is intended to be illustrative, and is not to be construed as limiting the invention.
The embodiment of the application provides a ferrite steel container sheet butt weld phased array ultrasonic detection method, which comprises the following steps:
1) the single-line array self-focusing phased array ultrasonic probe is respectively connected with an ultrasonic phased array instrument and a scanning device, the frequency of the single-line array self-focusing phased array ultrasonic probe is 5-7.5 MHz, the number of probe chips is 16-32, and the active aperture is 8-10 mm.
2) Inputting the scanned weld structure of the weld to be detected into an ultrasonic phased array instrument, setting a single-line array self-focusing phased array ultrasonic probe to be full-wafer excitation, and scanning in a sector scanning mode, wherein the scanning angle range is 45-75 degrees, and the maximum value of the sector scanning sound beam angle increment is 1 degree.
3) And scanning along the line by adopting double probes symmetrically arranged on two sides of the single side of the welding line, wherein the distance between the front end of each probe and the central line of the welding line is 6-10 mm during scanning, an ultrasonic phased array instrument generates an A scanning signal diagram, an S scanning signal diagram and a C scanning signal diagram, defect signals are observed, and the defect length is measured by adopting a-6 dB method.
In some embodiments, the focusing rule of the single-linear-array self-focusing phased array ultrasonic probe is set as follows: and 2-order waves and 3-order waves are adopted to carry out inspection on two sides of a single side of a welding line, the 2-order waves and the 3-order waves are separately arranged, the focusing depth is arranged at the maximum detection sound path, the defects close to the upper surface are scanned by the 2-order waves, and the defects close to the lower surface are scanned by the 3-order waves.
In some embodiments, the recording criteria are: when the reflection amplitude is more than or equal to phi 2mm-24dB, evaluation and recording are carried out; the acceptance criteria are: the defects that the reflection amplitude is more than or equal to phi 2-15dB or the indication length is more than or equal to 5mm are unqualified.
Before proceeding to step S1, the probe type and its parameters are determined by the following steps:
s1, basic characteristics of butt welding seams of the carded ferrite steel container thin plates: the method comprises the steps of welding materials, a welding process, a joint type, the condition of weld joint surplus height, the condition of accessibility and the like, wherein the adopted probe to be used is preliminarily determined to be a single-line array self-focusing phased array ultrasonic probe according to the basic characteristics of the weld joint, the frequency of the probe to be used is determined to be 5-7.5 MHz, the number of probe wafers is determined to be 16-32, and the active aperture is 8-10 mm.
And S2, performing CIVA simulation on the detected workpiece and the probe to be used, and analyzing the matching of the probe to be used and the detected workpiece, wherein the analysis comprises probe parameter sensitivity analysis, detection area sound field and sound beam coverage analysis, focusing rule, typical defect reflection amplitude response analysis and the like, and the analysis serves as the basis for detection method development.
S3, collecting and analyzing typical welding defects of the butt welding seam of the ferritic steel container thin plate, wherein the typical welding defects comprise defect positions, properties, size information and the like, and processing a series of test plates with artificial simulated defects by referring to size limit values in ray detection acceptance standards;
s4, inputting the size information of the welding seam into an ultrasonic phased array instrument, scanning on a test board for artificially simulating defects by using a phased array ultrasonic probe, observing an A scanning signal diagram, an S scanning signal diagram and a C scanning signal diagram, judging whether the defects can be found, and determining main technical parameters such as a scanning mode, a focusing rule and the like on the basis:
and (3) probe parameters: the frequency is 5MHz, the number of wafers is 32, the active aperture is 10mm, which is the optimal value, and the optimal values of sensitivity and signal-to-noise ratio can be obtained under the parameters.
The focusing rule: and 2-order waves and 3-order waves are adopted to carry out inspection on two sides of a single side of a welding line, the 2-order waves and the 3-order waves are separately arranged, the focusing depth is arranged at the maximum detection sound path, the defects close to the upper surface are scanned by the 2-order waves, and the defects close to the lower surface are scanned by the 3-order waves.
The scanning mode is as follows: the probe is set to be excited by a full wafer and is detected by adopting a fan-shaped scanning mode, the fan-shaped scanning angle range at least covers 45-75 degrees, and the maximum value of the fan-shaped scanning sound beam angle increment is 1 degree. The detection blind area can be greatly reduced, and the detection rate of the weld defects to be detected is improved.
Scanning mode: and scanning is carried out along the line by symmetrically arranging double probes on two sides of the single side of the welding line, the distance between the front end of each probe and the central line of the welding line is 6-10 mm, so that only one scanning is carried out, and the sound beams of 2-order waves and 3-order waves can effectively cover all inspection areas.
Detection sensitivity: in order to ensure the detection rate of defects, when a DAC curve (distance-amplitude curve) is adopted for detection sensitivity setting on the premise that the detection signal-to-noise ratio is allowed, the requirement of scanning sensitivity is not lower than DAC-24 dB; when the sensitivity setting adopts a TCG curve (distance-gain compensation curve), the scanning sensitivity is required to be as high as possible on the premise that the signal-to-noise ratio is greater than 6 dB.
Recording and acceptance criteria: the recording standard is: when the reflection amplitude is more than or equal to phi 2mm-24dB, evaluation and recording are carried out; and the defect that the reflection amplitude is more than or equal to phi 2-15dB or the indication length is more than or equal to 5mm is displayed as unqualified.
S5, carrying out ultrasonic detection and ray detection contrast tests aiming at real defects in butt welds of the ferritic steel container sheets, and further verifying and optimizing the reasonable feasibility of the technical parameters; based on the test result, a reasonable acceptance standard is determined, and the effect equivalent to that of ray detection is achieved.
Analysis and demonstration are developed from three aspects of basic weld joint characteristics, initial probe type selection and target defects, and input and technical support are provided for subsequent simulation analysis and test verification. The thickness of the butt-jointed seam of the ferritic steel container sheet is mainly 6-10 mm, the materials are mainly carbon steel and low alloy steel, the welding method comprises manual electric arc welding, manual tungsten-electrode argon arc welding, combination of manual argon arc welding and electric arc welding, submerged automatic arc welding and the like, and a full penetration butt-jointed joint mode is adopted. After investigation and analysis, a single-line array self-focusing phased array ultrasonic probe is adopted, the frequency is 5 MHz-7.5 MHz, the number of wafers is 16-32, and the active aperture is 8mm-10 mm. Through combing and analyzing the field ray detection result, the common defects of the butt weld of the thin plates of the ferritic steel container are unfused, slag inclusion and air holes are mainly, the unfused mainly comprises the unfused groove, and the slag inclusion and the air holes are randomly distributed in the weld.
And carrying out simulation analysis by using CIVA-UT software, and analyzing the influence of different technical parameters on the detection of the butt weld of the ferritic steel container sheet as the basis for the development of the detection method. Based on CIVA simulation analysis results, the front end of the phased array probe is 6-10 mm away from the central line of the welding seam to perform scanning along the line and sector scanning, so that the welding seam is completely covered by secondary and tertiary waves, and the angle range of sector scanning is 45-75 degrees. The double probes are symmetrically arranged on the two sides of the single side of the welding line and are used for detecting simultaneously, so that the defect detection rate, the reliability and the detection efficiency are improved.
Based on the type and the size of the target defect, a series of test plates with artificial defects such as unfused, pores and slag inclusion are manufactured, and the primary verification of the main technical parameters of the detection method is carried out. And inputting the related parameters into a phased array instrument, generating an A scanning image, an S scanning image and a C scanning image in the phased array instrument, observing a defect signal, and displaying the defect by adopting a half-wave height method (-6dB method).
And (3) developing a PAUT (polyamide-ether-urethane) and RT (reverse transcription) comparison test based on the actual defects of the butt weld of the ferritic steel container sheet, and finishing the optimization and adjustment of the detection method. According to the comparative test result, on the premise of ensuring the defect detection rate (especially the non-fusion type hazardous defects) and the reliability (conservation), establishing a feasible project record and acceptance standard: the recording standard is: when the reflection amplitude is more than or equal to phi 2mm-24dB, evaluation and recording are carried out; the acceptance criteria are: and the defect that the reflection amplitude is more than or equal to phi 2-15dB or the indication length is more than or equal to 5mm is displayed as unqualified.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; may be mechanically coupled, may be electrically coupled or may be in communication with each other; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the present disclosure, the terms "one embodiment," "some embodiments," "an example," "a specific example," or "some examples" and the like mean that a specific feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present disclosure. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (10)
1. A phased array ultrasonic detection method for a butt weld of a ferritic steel container thin plate is characterized by comprising the following steps: the method comprises the following steps of respectively accessing a single-line array self-focusing phased array ultrasonic probe into an ultrasonic phased array instrument and a scanning device, inputting a weld joint structure of a to-be-detected weld joint to be scanned into the ultrasonic phased array instrument, setting the single-line array self-focusing phased array ultrasonic probe to be full-wafer excitation, and scanning in a sector scanning mode; and scanning along the line by adopting double probes symmetrically arranged on two sides of the single side of the welding line, generating an A scanning signal diagram, an S scanning signal diagram and a C scanning signal diagram by using an ultrasonic phased array instrument, observing a defect signal, and measuring the length of the defect.
2. The phased array ultrasonic testing method for the butt weld of the ferritic steel container sheets as claimed in claim 1, characterized in that the frequency of the single-wire array self-focusing phased array ultrasonic probe is 5-7.5 MHz, the number of probe wafers is 16-32, and the active aperture is 8-10 mm.
3. The phased array ultrasonic testing method for the butt weld of the ferritic steel container sheet as recited in claim 1, characterized in that the scanning angle range is 45 ° to 75 °, and the maximum value of the fan-shaped scanning acoustic beam angle increment is 1 °.
4. The phased array ultrasonic testing method for the butt weld of the ferritic steel container sheets as claimed in claim 1, characterized in that the focusing rule of a single-wire array self-focusing phased array ultrasonic probe is set: and 2-order waves and 3-order waves are adopted to carry out inspection on two sides of a single side of a welding line, the 2-order waves and the 3-order waves are separately arranged, the focusing depth is arranged at the maximum detection sound path, the defects close to the upper surface are scanned by the 2-order waves, and the defects close to the lower surface are scanned by the 3-order waves.
5. The phased array ultrasonic testing method for the butt weld of the ferritic steel container sheet as claimed in claim 1, characterized in that during scanning, the distance from the front end of the probe to the center line of the weld is 6-10 mm.
6. The phased array ultrasonic testing method for the butt weld of the ferritic steel container sheet as set forth in claim 1, characterized in that the defect length measurement is performed by a-6 dB method.
7. The phased array ultrasonic testing method for the butt weld of the ferritic steel container sheets according to any one of claims 1 to 6, characterized in that the recording standard is: when the reflection amplitude is more than or equal to phi 2mm-24dB, evaluation and recording are carried out; the acceptance criteria are: the defects that the reflection amplitude is more than or equal to phi 2-15dB or the indication length is more than or equal to 5mm are unqualified.
8. The phased array ultrasonic testing method for the butt weld of the ferritic steel container sheet as claimed in claim 1, is characterized in that before the step S1, the type of the probe and the parameters thereof are determined by the following steps:
s1, basic characteristics of butt welding seams of the carded ferrite steel container thin plates: the method comprises the following steps of (1) primarily determining an adopted quasi-probe to be a single-line array self-focusing phased array ultrasonic probe according to basic characteristics of a welding material, a welding process, a joint type, a welding seam surplus height condition and a reachable condition, and determining the frequency, the number of probe chips and an active aperture of the quasi-probe;
s2, performing CIVA simulation on the detected workpiece and the quasi-use probe, and analyzing the matching property of the quasi-use probe and the detected workpiece;
s3, collecting and analyzing typical welding defects of the butt welding seam of the ferritic steel container thin plate, and processing a series of test plates with artificial simulation defects by referring to the size limit value in the ray detection acceptance standard;
and S4, inputting the size information of the welding seam into an ultrasonic phased array instrument, scanning on a test board by using a phased array ultrasonic probe, observing an A scanning signal diagram, an S scanning signal diagram and a C scanning signal diagram, judging whether the defect can be found or not, and determining main technical parameters on the basis.
9. The phased array ultrasonic testing method for the butt weld of the ferritic steel container sheet according to the claim 8, characterized in that in the step S2, the matching includes probe parameter sensitivity analysis, test area sound field and sound beam coverage analysis, focusing rule, and typical defect reflection amplitude response analysis.
10. The phased array ultrasonic testing method for the butt weld of the ferritic steel container sheet as claimed in claim 8, wherein in the step S4, the main technical parameters include probe parameters, focusing rule, scanning mode, detection sensitivity, recording and acceptance criteria.
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| CN117268297A (en) * | 2023-11-22 | 2023-12-22 | 国营川西机器厂 | Method and device for detecting transverse size of welding spot of double-layer catheter based on ultrasonic longitudinal wave |
| CN117268297B (en) * | 2023-11-22 | 2024-02-02 | 国营川西机器厂 | Method and device for detecting transverse size of welding spot of double-layer catheter based on ultrasonic longitudinal wave |
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