CN111380952B - Nondestructive testing device and method for dirt and carburization defects of inner wall of seamless steel tube - Google Patents
Nondestructive testing device and method for dirt and carburization defects of inner wall of seamless steel tube Download PDFInfo
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- CN111380952B CN111380952B CN201811633308.4A CN201811633308A CN111380952B CN 111380952 B CN111380952 B CN 111380952B CN 201811633308 A CN201811633308 A CN 201811633308A CN 111380952 B CN111380952 B CN 111380952B
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- G—PHYSICS
- G01—MEASURING; TESTING
- 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
- G01N27/82—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws
- G01N27/90—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws using eddy currents
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
Abstract
A nondestructive testing device and method for dirt and carburization defects on the inner wall of a seamless steel tube comprises the following steps: 1) Adjusting eddy current detection parameters; 2) The eddy current detection frequency is selected to be 1-10 KHz; 3) The phase of the vortex signal of the standard sample tube is adjusted, and the vortex signal of the standard sample tube is placed on the X-axis to deviate by 10 degrees up and down from the standard value; 4) Adjusting sensitivity parameters on the instrument to ensure that the signal amplitude is 60-80% of the full amplitude of the X axis of the instrument, namely the horizontal axis; 5) 4 times of eddy current signal amplitude is observed by passing through an eddy current probe at intervals of 90 degrees, and the maximum and minimum values are 70-90%; 6) The parameters of the instrument are not moved, other eddy current inspection type sample tubes are taken for testing, and the phase of the artificial defect signal is observed; the phase of the signal should have a significant phase difference with the soil and carburized analog signal for identification; 7) Setting a circle domain alarm mode; 8) Detecting the alloy pipe to be detected; 9) And judging that the detected signal is unqualified if the detected signal exceeds the set signal amplitude.
Description
Technical Field
The invention relates to a nondestructive testing technology, in particular to a nondestructive testing device and method for dirt and carburization defects on the inner wall of a seamless steel tube.
Background
The seamless steel pipe is a common metallurgical and ferrous product, and a plurality of working procedures are needed from metal smelting and steel rolling to finished product delivery, and in order to ensure that the processing quality of the seamless steel pipe meets the corresponding technical requirements, nondestructive inspection is needed after the corresponding deformation processing working procedures.
The U-shaped tube bundle of 690 alloy tubes for nuclear power is applied to the inside of a primary nuclear evaporator, chinese brands NS3105, U.S. brands UNS N06690 and French brands NC30Fe U-shaped tube bundle, is an extrusion tube obtained by extruding a large-specification extrusion tube blank, is deformed by a plurality of cold working processes to prepare straight tubes with the length of 19-26 m, is bent to obtain U-shaped tubes with different bending radiuses, and is assembled according to technical requirements. The nominal outer diameter of 690 alloy pipe is generally selected between 17.48-19.05mm according to different types of steam generators, the wall thickness is about 1.01-1.09mm, and the length-diameter ratio (length/outer diameter) of the 690 alloy pipe reaches 1232 (22500/18.26). One steam generator is provided with about 5000 to 8000 pipes which are different according to different models of the unit, and one unit is formed by about 2 to 3 steam generators according to different powers.
690 alloy pipe making technology is mastered by few countries, because 690 alloy pipe uses, the product quality requirements are strict, besides the existing conventional nondestructive testing measures, after the straight pipe making is finished, the working procedures of heat treatment, straightening, external polishing and the like before the pipe bending machining are carried out, various tests such as sample material organization and mechanical property test, branch-by-branch size and flaw detection (ultrasonic) test, roughness test and the like including pipe inner wall dirt and carburization test are carried out according to the technical requirements, and the pipe bending machining working procedure can be carried out after each test is qualified. Because of foreign technical barriers, no related mature nondestructive testing technology exists in China, and nondestructive testing is generally implemented by referring to nuclear power pipe technical specifications. The working procedure method related to the detection of the dirt and carburization of the inner wall mainly comprises the following steps: (1) dirt inspection: manually checking by adopting an endoscope; (2) carburizing and checking: and (3) performing physicochemical inspection on samples obtained from adjacent areas around the found dirt in the endoscope inspection, and observing whether the carburized layer is qualified. The detection operation procedure flow mainly comprises the following steps:
(1) dirt inspection: after ultrasonic inspection, tissue and mechanical property inspection, the endoscope cable which is 20 m long and is at least 3mm thinner than the inner diameter of the pipe is inserted into the pipe to be detected by manpower, and is slowly pulled out during recovery, and meanwhile, images acquired by a miniature camera installed on the head of the cable and displayed on a display screen are observed to be distinguished. The operation procedures are as follows:
opening an endoscope, checking the external protection of an endoscope video cable with the length of 20 meters, checking the marked length scale from a camera on the endoscope video cable with the length of 20 meters, inserting the cable into the inner hole of a pipe, until the image that the miniature camera at the end of the video cable extends to the other end of the pipe is seen on a display screen, slowly pulling out the video cable at the speed of about 1 cm per second, simultaneously observing the image on the display screen, stopping pulling the cable when the dirt is seen on the display screen, slightly moving the cable, reading the position scale value (which is the dirt area) displayed on the cable in the initial and final areas of the dirt, checking the dirt with the map, recording g, repeating h according to the steps of e-g until the dirt checking of the inner wall of the 690 alloy pipe is finished, and cutting the dirt part after calculating the length of the qualified part if the check exceeds the map requirement, otherwise, and scrapping the whole product.
(2) Carburizing and checking: the physical and chemical examination is carried out on samples obtained from adjacent areas around 690 alloy pipes with dirt found in the endoscope examination, namely, the physical and chemical examination is carried out by sampling (cutting section) at suspected positions and then carrying out the examination under a microscope. The operation procedures are as follows:
a. taking samples close to two sides of a dirt part (but not including the dirt part) in the qualified pipe in the dirt checking step, b. Preparing metallographic samples of each obtained 2 samples, c. Observing the samples under a microscope, d obtaining a carburization checking result, e. Recording, and repeating the steps according to the steps of a-e operation circularly until the pipe inspection of the suspected carburization defects in the batch 690 of alloy pipes is finished.
Although the existing dirt inspection and carburization inspection can meet the inspection precision required by the technical standard of 690 alloy pipes, certain defects exist, namely:
1) Time consuming: a tube material is inserted from an endoscope cable to recovery, observation and video recording, and the time for completing the dirt inspection is 417-667 hours according to 5000-8000 branch tube materials of a steam generator.
2) The cost is high: the service life of an endoscope video cable is up to 2 ten thousand counts, the service life of the endoscope video cable needs to be replaced, otherwise the accuracy of inspection and discrimination is reduced, and the manufacturers of the endoscope video cable can count the number of the whole world, the price is monopoly, the purchasing period is long, the purchasing cost is high, and each 30 ten thousand yuan (15 yuan for single-count detection cost of the endoscope video cable according to the detection of 2 ten thousand branches of materials) is realized.
3) The yield is low: the carburization degree inspection of the inner wall of the pipe needs sampling for destructive inspection, and even if the inspection is in accordance with the technical standard, 690 alloy pipe is destroyed and cannot be used, so that the yield is low.
4) The labor intensity is high: all adopt manual operation, transport, sample, system appearance, observe, judge, especially operating personnel's skill experience requires higher, is unfavorable for the arbitrary power resource allocation of enterprise, and receives the emotional state influence greatly.
5) Defects are not easy to identify: the carburization exceeding of the defect part of the inner wall of the 690 alloy pipe cannot be identified quickly, the overall detection efficiency is affected, and the method becomes the longest time-consuming inspection procedure.
The eddy current flaw detection is a flaw detection method which is used for detecting the surface and near-surface defects of a conductive member and is quick in speed, easy to realize industrial automatic detection, capable of detecting flaws, revealing dimensional changes and material characteristics, and accordingly evaluating the characteristics of heat treatment effect, material quality, measured dimensions and the like, and therefore becomes a main mode of nondestructive detection of a seamless steel tube at present.
In summary, the existing 690 alloy pipe inner wall dirt and carburization defect detection method has certain defects, and the eddy current flaw detection principle is utilized to implement corresponding technical improvement on the existing inner wall dirt and carburization defect detection method, so that automatic nondestructive detection is realized on the basis of ensuring detection quality, the operation efficiency is improved, the labor intensity is reduced, the detection cost is reduced, and the dependence on technical experience of operators is reduced.
Disclosure of Invention
The invention aims to design a nondestructive testing device and method for dirt and carburization defects on the inner wall of a seamless steel pipe, fully utilizes eddy current flaw detection equipment, prepares and uses a standard sample tube through simulating defects, replaces an endoscope and sampling test mode, realizes automatic detection of dirt and carburization defects on the inner wall of an alloy pipe, improves the operation efficiency by more than 3 times on the basis of ensuring the detection quality, does not perform destructive detection on the pipe, reduces the detection cost, and meets the requirements of nondestructive flaw detection on the alloy pipe.
In order to achieve the above purpose, the technical scheme of the invention is as follows:
a nondestructive testing device for dirt and carburization defects on the inner wall of a seamless steel tube is a standard sample tube and comprises: a main pipe is cut out from all detected alloy pipes with the length of 1.6-3.3 m, three round holes with the diameter not more than 5mm are processed on the outer circumferential surface of the main pipe at equal intervals, and the space between the round holes is more than or equal to 200mm; the fixed column is made of nonmetallic materials, the middle part of the outer wall of the fixed column is provided with steps along the circumferential direction to form a large diameter section and a small diameter section, and threads are machined on the outer circumferential surface of the cylinder of the small diameter section; the diameter of the large-diameter section cylinder is 0.01-0.03 mm larger than the inner diameter of the measured alloy pipe; a rectangular gap is formed in the side wall of the graphite ring along the axial direction to form a C-shaped structure; the graphite ring is sleeved on the small-diameter section of the fixed column, and one side of the graphite ring is propped against the step surface; a fixed sleeve, one end of which is open, and the inner wall of which is provided with threads; the fixing sleeve is sleeved on the small-diameter section cylinder of the fixing column, the end part of the fixing sleeve is propped against the outer side end of the graphite ring, and the graphite ring is positioned and fastened in the main pipe by being in threaded fit with the outer circumferential surface of the small-diameter section cylinder; a small hole for the lead wire to pass through is arranged in the center of the inner bottom of the fixed sleeve; the lead wire is a non-metal fine wire, and one end of the lead wire stretches into the fixing sleeve from the small hole of the fixing sleeve and is fixed.
Preferably, the length of the main pipe is 2.5-3.0 m.
Preferably, the fixing column is made of composite nylon.
Preferably, the length of the lead exceeds 20-30% of the length of the alloy pipe to be measured.
The diameter and thickness of the graphite ring are customized according to the eddy current signal requirement of the simulation defect.
The invention relates to a detection method of a nondestructive detection device for dirt and carburization defects on the inner wall of a seamless steel pipe, which comprises the following steps:
1) And (3) adjusting eddy current detection parameters: the standard sample tube passes through the eddy current detection probe, and the eddy current signal of the standard sample tube is displayed on the instrument display screen for detection;
2) Selecting an optional numerical value of eddy current detection frequency between 1 and 10KHz;
3) The phase of the vortex signal of the standard sample tube is adjusted, and the vortex signal of the standard sample tube is arranged on the X axis (+/-)
10°)；
4) Adjusting sensitivity parameters on the instrument to enable the signal amplitude to be a value which is selected between 60% and 80% of the full amplitude of the X axis of the instrument, namely the horizontal axis;
5) 4 times of eddy current probe passing at 90 degree intervals, observing the eddy current signal amplitude of the standard sample tube for 4 times, wherein the maximum and minimum values of the eddy current signal amplitude are between 70% and 90% of the full amplitude of the instrument display screen;
6) The parameters of the instrument are not moved, other eddy current inspection type sample tubes are taken for testing, and the signal phase of the artificial defect is observed, wherein the artificial defect is a flat bottom hole with a certain diameter processed on the outer surface of the tube; the phase of the signal is obviously different from that of the filth and carburized analog signals for identification, otherwise, the detection frequency is adjusted, and the steps are repeated until the phases of the two signals have easy-to-identify difference;
7) Setting a circle domain alarm mode, and taking 65-75% of the full amplitude of an X axis of the instrument, namely a horizontal axis, as an alarm threshold; preferably 70% amplitude value;
8) Detecting the alloy pipe to be detected;
9) If the detected signal exceeds the set signal amplitude, judging that the detected signal is unqualified, otherwise, judging that the detected signal is qualified.
The invention relates to a nondestructive testing device and method for inner wall dirt and carburization defect of seamless steel tube, which comprises two parts of standard sample tube for simulating defect and inner wall dirt and carburization defect testing method, namely: the standard sample tube is arranged on the eddy current flaw detection equipment, the automatic detection of dirt and carburization defects on the inner wall of a seamless steel tube such as 690 alloy tube is realized through the fault scanning function of the probe, and the parameters of the sample tube and the simulated defect parameters can be realized through adjusting the eddy current frequency and the geometric parameters of a graphite ring.
The invention utilizes the eddy current flaw detection principle and adopts a manual simulation flaw comparison mode to realize automatic nondestructive detection. The artificial defect simulation device adopts a standard sample tube with an integral structure, a graphite ring is arranged in the standard sample tube, and eddy current signals sent by carburization defects are simulated through the C-shaped graphite ring.
According to the invention, eddy current flaw detection equipment is fully utilized, standard sample tubes are prepared and used by simulating defects, an endoscope and sampling inspection mode is replaced, automatic detection of dirt and carburization defects on the inner wall of the 690 alloy tube is realized, the operation efficiency is improved by more than 3 times on the basis of ensuring the detection quality, destructive detection of the tube is avoided, the detection cost is reduced, and the requirements of nondestructive flaw detection of the 690 alloy tube are met. The improved mode is reasonable, the structure is compact, the installation, the use and the maintenance are convenient, the thickness (the size of the simulated defect) of the C-shaped graphite ring can be adjusted, the required vortex signals can be adjusted, the working procedure is smooth, the method is safe and reliable, the method is practical and efficient, the improvement cost is low, the investment is low, the field implementation is easy, the application value is good, the technical requirement of nondestructive testing of small-aperture seamless steel pipes is met, and the method is a domestic initial technology. The method has strong universality, improves the detection method for detecting dirt and carburization defects in seamless steel pipes of other types and specifications, and has certain reference and application values.
The invention has the beneficial effects that:
1. according to the invention, eddy current flaw detection equipment is fully utilized, and through simulating defects, the synchronous execution of 690 alloy pipe inner wall dirt and carburization detection is realized, so that the method is a domestic initiative, and similar technology is not found abroad, and has a certain creativity;
2. the standard sample tube is used for preparation, an endoscope and sampling inspection mode is replaced, automatic detection of dirt and carburization defects on the inner wall of the 690 alloy tube is realized, the operation efficiency is improved by more than 3 times on the basis of ensuring the detection quality, and the detection cost is reduced;
3. the improved mode is reasonable, the structure is compact, the installation, the use and the maintenance are convenient, and the required eddy current signal can be regulated by adjusting the thickness (the size of the simulated defect) of the C-shaped graphite ring;
4. the problem of destructive sampling inspection is effectively solved, the detection operation with low cost, high efficiency and high quality is realized, the yield is improved, and the method is practical and efficient;
5. the dependence on the skill and experience requirements of operators is reduced without using an imported endoscope cable;
6. the improvement cost is low, the investment is low, the field implementation is easy, the application value is good, and the technical requirements of nondestructive testing of small-aperture seamless steel pipes are met;
7. the method has strong universality, improves the detection method for detecting dirt and carburization defects in seamless steel pipes of other types and specifications, and has certain reference and application values.
Drawings
FIG. 1 is a schematic diagram of a nondestructive testing device (standard cuvette) embodiment of the present invention;
FIG. 2 is a schematic diagram of the structure of an embodiment of the nondestructive testing device (standard cuvette) of the present invention;
FIG. 3 is a schematic view of the structure of a graphite ring in an embodiment of the nondestructive testing device (standard cuvette) of the present invention;
FIG. 4 is a graph showing the position and amplitude control range of the soil and carburized signal according to the present invention;
FIG. 5 is a schematic diagram of the contamination and carburization signal and defect signal of the inner wall of the tube during normal detection according to the present invention;
FIG. 6 shows the eccentric state of the tube and the detecting coil of the invention-Guan Nabi dirt is furthest away from the detecting coil;
FIG. 7 shows the concentric state of the tube and the detection coil of the present invention-Guan Nabi dirt is nearly equidistant from the detection coil in all directions;
FIG. 8 shows the tube and sense coil of the present invention off-center-Guan Nabi dirt is nearest the sense coil.
Detailed Description
Referring to fig. 1 to 3, the nondestructive testing device for the dirt and carburization defect of the inner wall of a seamless steel pipe according to the present invention is a standard sampling tube, comprising:
the method comprises the steps that a main pipe 1 is cut out from all detected alloy pipes with qualified detection, the length is 1.6-3.3 m, three round holes 101 with diameters not exceeding 5mm are processed on the outer circumferential surface of the main pipe at equal intervals, and the distance between the round holes is more than or equal to 200mm;
the fixed column 2 is made of composite nylon, the middle part of the outer wall of the fixed column is provided with a step 21 along the circumferential direction to form a large diameter section and a small diameter section, and threads are processed on the outer circumferential surface of a cylinder 22 of the small diameter section; the diameter of the large-diameter section cylinder 23 is 0.01-0.03 mm larger than the inner diameter of the measured alloy pipe;
a rectangular gap 31 is formed on the side wall of the graphite ring 3 along the axial direction to form a C-shaped structure; the graphite ring 3 is sleeved on the small-diameter section cylinder 22 of the fixed column 2, and one side of the graphite ring is propped against the step surface;
a fixing sleeve 4 with one end open and the inner wall provided with threads; the fixing sleeve 4 is sleeved on the small-diameter section cylinder 22 of the fixing column 2, the end part of the fixing sleeve abuts against the outer side end of the graphite ring 3, and the graphite ring 3 is positioned and fastened in the main pipe 1 through the threaded fit of the fixing sleeve 4 and the outer circumferential surface of the small-diameter section cylinder 22; a small hole 41 for the lead wire to pass through is arranged in the center of the inner bottom of the fixed sleeve 4;
a lead wire (not shown) is a non-metal thin wire, and one end of the lead wire extends into the fixing sleeve 4 from the small hole 41 of the fixing sleeve 4 and is fixed.
Preferably, the length of the main pipe 1 is 2.5-3.0 m.
Preferably, the fixing column 2 is made of composite nylon.
Preferably, the graphite ring 3 is a concentric reducing ring with rectangular grooves on the circumferential surface, and the diameter and thickness of the graphite ring are customized according to the eddy current signal requirement of the simulation defect.
Preferably, the length of the lead exceeds 20-30% of the length of the alloy pipe to be measured.
The invention relates to a detection method of a nondestructive detection device for dirt and carburization defects on the inner wall of a seamless steel pipe, which comprises the following steps:
1) And (3) adjusting eddy current detection parameters: the standard sample tube passes through the eddy current detection probe, and the eddy current signal of the standard sample tube is displayed on the instrument display screen for detection;
2) Selecting an optional numerical value of eddy current detection frequency between 1 and 10KHz;
3) The phase of the vortex signal of the standard sample tube is adjusted, and the vortex signal of the standard sample tube is arranged on the X axis (+/-)
10°)；
4) Adjusting sensitivity parameters on the instrument to enable the signal amplitude to be a value which is selected between 60% and 80% of the full amplitude of the X axis of the instrument, namely the horizontal axis;
5) 4 times of eddy current probe passing at 90 degree intervals, observing the eddy current signal amplitude of the standard sample tube for 4 times, wherein the maximum and minimum values of the eddy current signal amplitude are between 70% and 90% of the full amplitude of the instrument display screen;
6) The parameters of the instrument are not moved, other eddy current inspection type sample tubes are taken for testing, and the phase of an artificial defect signal is observed, wherein the artificial defect signal is generally a flat bottom hole with a certain diameter which is processed on the outer surface of the tube; the phase of the signal is obviously different from that of the filth and carburized analog signals for identification, otherwise, the detection frequency is adjusted, and the steps are repeated until the phases of the two signals have easy-to-identify difference;
7) Setting a circle domain alarm mode, and taking a 70% amplitude value as an alarm threshold value;
8) Detecting the alloy pipe to be detected;
9) If the detected signal exceeds the set signal amplitude, judging that the detected signal is unqualified, otherwise, judging that the detected signal is qualified. Referring to fig. 4, a soil and carburized signal display position and amplitude control range is shown, wherein:
soil and carburization signal at 70% amplitude position of X axis: the dirt in the pipe is farthest away from the detection coil-in an eccentric state;
dirt and carburization signal at 80% amplitude position of X axis: the dirt in the pipe and the detection coil are equidistant-concentric in all angle directions;
dirt and carburization signal at 90% amplitude position of X-axis: the dirt in the pipe is closest to the detection coil-eccentric state.
Referring to fig. 5, a schematic diagram of a defect signal and a carburized signal on the inner wall of a tube during normal detection is shown, wherein 10 is the defect signal, 20 is the inner wall dirt and the carburized signal, and α is the phase difference between the defect signal and the inner wall dirt and carburized signal.
FIG. 6 shows the eccentric state of the steel pipe 100 and the detecting coil 200 of the present invention, namely, the dirt 300 on the inner wall of the pipe is farthest away from the detecting coil 200;
FIG. 7 shows the concentric state of the steel pipe 100 and the detecting coil 200 of the present invention, in which the dirt 300 on the inner wall of the pipe is almost equidistant from the detecting coil 200 in all directions;
fig. 8 shows the steel pipe 100 and the detecting coil 200 of the present invention in an eccentric state, i.e., the dirt 300 on the inner wall of the pipe is closest to the detecting coil 200.
Examples:
taking a seamless steel tube of alloy 690 with the specification of phi 19.05 x 1.09 as an example, with the Chinese trademark NS3105, the U.S. trademark UNS N06690 and the French trademark NC30Fe, the process method for automatically detecting the internal dirt and carburization defects comprises the following steps:
1) Standard sample tube assembly: one end of the lead wire passes through the small-diameter round hole of the fixed sleeve and is fixedly connected with the main body, then the C-shaped graphite ring is assembled on the small-diameter section of the fixed column in an oriented way, and the threaded hole in the fixed sleeve with the lead wire is fastened with the threaded pair Ji Xuan of the small-diameter section of the fixed column in a screwed way.
2) Standard coupon line-up: and (3) adopting lead traction, combining a fixed sleeve and a fixed column which are provided with graphite rings, directionally loading the fixed sleeve and the fixed column into an inner hole of a main pipe, traction to a central position, and taking out the lead.
3) And (3) adjusting eddy current detection parameters: the standard sample tube passes through the eddy current testing probe, the signal can be displayed on the instrument display screen, the testing is carried out, the operation procedures are as follows:
(1) selecting an eddy current detection frequency of 10KHz (a value is optionally selected between 1 and 10 KHz);
(2) adjusting the phase of the vortex signal of the standard sample tube, and placing the vortex signal of the standard sample tube on an X axis (+ -10 degrees);
(3) adjusting sensitivity parameters on the instrument to ensure that the signal amplitude is about 80 percent (a value is optionally selected between 60 and 80 percent) of the full amplitude of an X axis (horizontal axis) of the instrument;
(4) 4 times of eddy current signal amplitude is observed by passing through an eddy current probe at 90 degrees intervals, wherein the maximum and minimum values of the eddy current signal amplitude are between 70% and 90% of the full amplitude of a display screen of the instrument;
(5) the instrument parameters are not moved, other eddy current test type sample tubes are taken for testing and observing the signal phase of the artificial defect (generally, a flat bottom hole with a certain diameter is processed on the outer surface of the tube), the signal phase has obvious phase difference with the sewage and carburization analog signals for identification, otherwise, the detection frequency is adjusted, and the steps are repeated until the phases of the two signals have easy identification differences;
(6) setting a circle domain alarm mode, and taking a 70% amplitude value as an alarm threshold value;
(7) detecting;
(8) if the detected signal exceeds the set signal amplitude, judging that the detected signal is unqualified, otherwise, judging that the detected signal is qualified.
690 alloy pipe inner wall dirt and carburization defect detection field operation process flow is:
manufacturing a dirt and carburization detection sample tube according to a judgment criterion, adjusting sample tube signal parameters (phase, sensitivity, frequency and the like), c carrying out dirt and carburization detection while carrying out ultrasonic detection one by one, d detecting, marking unqualified parts, e regularly carrying out sample tube verification, continuing the detection if the unqualified parts meet preset and requirement, f detecting, blanking the tube, g recording, and recording and compiling a detection report after the detection is finished.
According to the nondestructive testing device and method, eddy current flaw detection equipment is fully utilized, standard sample tubes are prepared and used instead of an endoscope and a sampling testing mode through simulation of defects, automatic synchronous detection of dirt and carburization defects inside 690 alloy tubes is achieved, the operation efficiency is improved by more than 3 times on the basis of ensuring the detection quality, the tubes are not subjected to destructive detection, the detection cost is reduced, the production requirement of a high-end nuclear power tube quality testing procedure is met, and the nondestructive testing device and method are domestic initial technology, have no related report at home and abroad and have certain creativity. The improved mode is reasonable, the structure is compact, the installation, the use and the maintenance are convenient, the thickness (the size of the simulated defect) of the C-shaped graphite ring can be adjusted, the required vortex signals can be adjusted, the working procedure is smooth, the method is safe and reliable, the method is practical and efficient, the improvement cost is low, the investment is low, the field implementation is easy, the application value is good, the technical requirement of nondestructive testing of small-aperture seamless steel pipes is met, and the method is a domestic initial technology. The method has strong universality, improves the detection method of the internal dirt and carburization defects of seamless steel pipes of other types and specifications, has certain reference and application values, can create economic benefit of more than 200 ten thousand yuan each year, and has wide market application prospect.
Claims (8)
1. A nondestructive test device for seamless steel pipe inner wall filth and carburization defect, its characterized in that: it is a standard coupon comprising:
a main pipe is cut out from all detected alloy pipes with the length of 1.6-3.3 m, three round holes with the diameter not more than 5mm are processed on the outer circumferential surface of the main pipe at equal intervals, and the space between the round holes is more than or equal to 200mm;
the fixed column is made of nonmetallic materials, the middle part of the outer wall of the fixed column is provided with steps along the circumferential direction to form a large diameter section and a small diameter section, and threads are machined on the outer circumferential surface of the cylinder of the small diameter section; the diameter of the large-diameter section cylinder is 0.01-0.03 mm larger than the inner diameter of the measured alloy pipe;
a rectangular gap is formed in the side wall of the graphite ring along the axial direction to form a C-shaped structure; the graphite ring is sleeved on the small-diameter section of the fixed column, and one side of the graphite ring is propped against the step surface;
a fixed sleeve, one end of which is open, and the inner wall of which is provided with threads; the fixing sleeve is sleeved on the small-diameter section cylinder of the fixing column, the end part of the fixing sleeve is propped against the outer side end of the graphite ring, and the graphite ring is positioned and fastened in the main pipe by being in threaded fit with the outer circumferential surface of the small-diameter section cylinder; a small hole for the lead wire to pass through is arranged in the center of the inner bottom of the fixed sleeve;
the lead wire is a non-metal fine wire, and one end of the lead wire stretches into the fixing sleeve from the small hole of the fixing sleeve and is fixed.
2. The nondestructive testing device for the dirt and carburization defect of the inner wall of a seamless steel pipe according to claim 1, wherein the length of the parent pipe is 2.5-3.0 m.
3. The nondestructive testing device for the contamination and carburization defect of the inner wall of a seamless steel tube according to claim 1, wherein the fixing column is made of composite nylon.
4. The nondestructive testing device for contamination and carburization defects of inner walls of seamless steel pipes according to claim 1, wherein the graphite ring is a concentric different diameter ring having rectangular grooves on the circumferential surface.
5. The nondestructive testing device for contamination and carburization defects of inner walls of seamless steel pipes according to claim 1, wherein the length of the lead wire exceeds 20-30% of the length of the alloy pipe being tested.
6. The method for detecting the non-destructive inspection device for the dirt and carburization defect of the inner wall of the seamless steel pipe according to claim 1, comprising the steps of:
1) And (3) adjusting eddy current detection parameters: the standard sample tube passes through the eddy current detection probe, and the eddy current signal of the standard sample tube is displayed on the instrument display screen for detection;
2) Selecting an optional numerical value of eddy current detection frequency between 1 and 10KHz;
3) The phase of the vortex signal of the standard sample tube is adjusted, and the vortex signal of the standard sample tube is placed on the standard value of the X axis to deviate by 10 degrees up and down;
4) Adjusting sensitivity parameters on the instrument to enable the signal amplitude to be a value which is selected between 60% and 80% of the full amplitude of the X axis of the instrument, namely the horizontal axis;
5) 4 times of eddy current probe passing at 90 degree intervals, observing the eddy current signal amplitude of the standard sample tube for 4 times, wherein the maximum value and the minimum value of the eddy current signal amplitude are between 70% and 90% of the full amplitude of the instrument display screen;
6) The parameters of the instrument are not moved, other eddy current inspection type sample tubes are taken for testing, and the signal phase of the artificial defect is observed, wherein the artificial defect is a flat bottom hole with a certain diameter processed on the outer surface of the tube; the phase of the signal is obviously different from that of the filth and carburized analog signals for identification, otherwise, the detection frequency is adjusted, and the steps are repeated until the phases of the two signals have easy-to-identify difference;
7) Setting a circle domain alarm mode, and taking an amplitude value of 65-70% of the full amplitude of an X axis of the instrument, namely a horizontal axis, as an alarm threshold;
8) Detecting the alloy pipe to be detected;
9) If the detected signal exceeds the set signal amplitude, judging that the detected signal is unqualified, otherwise, judging that the detected signal is qualified.
7. The method for detecting the non-destructive testing device for the dirt and the carburized defect on the inner wall of the seamless steel pipe according to claim 6, wherein the standard sample tube is arranged on the eddy current flaw detection equipment, the dirt and the carburized defect on the inner wall of the seamless steel pipe are automatically detected by the fault scanning function of the probe, and the parameters of the sample tube and the simulated defect are realized by adjusting the eddy current frequency and the geometric parameters of the graphite ring.
8. The method for detecting the non-destructive testing device for the dirt and carburized defect on the inner wall of the seamless steel tube according to claim 6, wherein the step 7) is to set a circle alarm mode, and the 70% amplitude value is used as an alarm threshold.
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