CN111337570A - Ultrasonic flaw detection system for nuclear-grade stainless steel outer sleeve and flaw detection method thereof - Google Patents
Ultrasonic flaw detection system for nuclear-grade stainless steel outer sleeve and flaw detection method thereof Download PDFInfo
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- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
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Abstract
The invention discloses an ultrasonic flaw detection system and method for a nuclear-grade stainless steel outer sleeve, which comprises the following steps: the probe is arranged in the box type detection mechanism, the end part of the box type detection mechanism is provided with a pipe blank aperture for the nuclear grade stainless steel outer sleeve to pass through, and the probe is a combined probe; further comprising: an end cover arranged in the aperture of the tube blank, and a sealing ring is arranged between the end cover and the aperture of the tube blank; the guide sleeve is arranged on the outer side surface of the end cover, and a sealing gasket is arranged between the guide sleeve and the outer side surface of the end cover; the combined probe is a combined probe with a built-in wafer. The invention effectively solves the problem of ultrasonic flaw detection of the nuclear-grade stainless steel jacket and realizes flaw detection operation with low cost, high efficiency and high quality.
Description
Technical Field
The invention relates to an inspection device of a seamless steel pipe, in particular to an ultrasonic flaw detection system for a nuclear-grade stainless steel outer sleeve and a flaw detection method thereof, which are particularly suitable for ultrasonic nondestructive inspection production of a 0Cr17Ni12Mo2Ti (316Ti) seamless steel pipe.
Background
The seamless steel pipe is common metallurgical and steel products, and needs a process 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 flaw detection is needed after the corresponding deformation processing process.
The ultrasonic flaw detection has the characteristics of good directivity, short wavelength, small loss in high-density solids, large reflection on interfaces of media with different densities and the like, has higher detection rate on the area defects, can meet the flaw detection requirements on defects such as internal structure cracks, lap joints, inclusion corrosion pits, unsuitable plastic laminated layers for processing and the like, has low detection cost, high speed, small volume of an inspection instrument, light weight and convenient field use, and is called as a main nondestructive flaw detection mode in the quality inspection process of the seamless steel pipe at present.
The 0Cr17Ni12Mo2Ti seamless steel tube is 316Ti, is used for stainless steel outer sleeves of nuclear-involved facility components, is a hexagonal seamless steel tube, is formed by processing and manufacturing the tube into a phi 68.3 x 1.3mm circular seamless steel tube in advance and then is processed and molded (a hexagonal tube), so that the processing quality of the phi 68.3 x 1.3mm circular seamless steel tube is ensured to meet the technical requirements, and a high-quality tube blank can be provided for manufacturing the hexagonal seamless steel tube. Because of the special application of the seamless steel pipe, the requirement on the quality of pipe making and processing is strict, and the ultrasonic flaw detection is adopted as the main mode of nondestructive testing of the process quality and is also the key process for ensuring the processing quality.
As shown in figure 1, according to the specification of technical requirements such as product characteristics, application, quality and the like, the process of rolling and manufacturing the seamless steel tube comprises the steps of preparing a tube blank (round steel sawing, peeling, end face turning, drilling), extruding and manufacturing the tube, cold rolling the tube, carrying out heat treatment, carrying out acid cleaning and degreasing, straightening, cutting, inspecting and the like, and when the finished tube with the diameter of 68.3 mm to 1.3mm is finally rolled, the defect detection inspection of the inner wall and the outer wall of the seamless steel tube is required to be carried out by 100 percent of ultrasonic waves. The gauge flaw (artificial defect machined on the tube) was 0.072 x 0.12 x 5.0mm (i.e., defect depth x width x length). The quality level of the artificial defect is very severe, particularly the length of the artificial defect is only 5.0mm, the internationally recognized length of the artificial defect of the high-standard aviation pipe is 7.0mm, and the severe quality requirement puts high requirements on equipment and a process for implementing ultrasonic flaw detection. As shown in fig. 2, the main process flow of the ultrasonic nondestructive inspection comprises:
1) preparing a sample tube: the method comprises the steps that a seamless steel pipe with the same overall dimension as that of the seamless steel pipe of the model is processed into a sample pipe for ultrasonic flaw detection, an outer wall flaw is processed in the middle of the sample pipe, an outer wall flaw is processed at one port of the sample pipe, an inner wall flaw is processed at the other port of the sample pipe, the dimensions (depth, width and length) of the three artificial flaws are processed according to product requirements, and the sample pipe needs to be measured after being processed to determine whether the sample pipe meets standard requirements or not;
2) sample tube on-machine debugging: debugging the sample tube on an ultrasonic flaw detection device, and collecting and accumulating various parameters;
3) static debugging: after debugging is finished, the sample tube is subjected to checking static debugging on ultrasonic flaw detection equipment, and a debugging result is confirmed; the method comprises the following steps that a detection frame provided with a probe is leaned on a pipe, the relative position of the frame and the pipe is ensured to be unchanged (namely the relative position of the probe and the pipe is ensured to be unchanged), the relative position of the probe on the frame and the axial line of the pipe is continuously adjusted (namely the 'eccentricity' is adjusted, the incident angle of sound waves on the surface of the pipe is changed by adjusting the relative position, further, incident longitudinal waves are changed into pure transverse waves in the wall thickness of the pipe, and the reflection of the pure transverse waves on the artificial defects of the inner wall and the outer wall of the pipe meets the specified requirements), so that the wave height reflected by the inner wall injury and the outer wall injury;
4) dynamic debugging: carrying out sample tube dynamic verification by adopting parameters (sample tube parameters and equipment motion parameters) consistent with the flaw detection to be carried out, and switching to formal flaw detection;
5) flaw detection operation: carrying out ultrasonic nondestructive flaw detection quality inspection on the seamless steel pipes one by one according to the process technical requirements;
6) recording and reporting: and recording and compiling a flaw detection report after flaw detection is finished.
As the seamless steel pipe of the model is a domestic test product, no production processing example exists in the past, the quality and technical requirements are strict, and the seamless steel pipe is qualified by testing the mechanical property, the metallographic structure, the nonmetallic inclusion, the grain size and the intergranular corrosion besides the inspection qualification, the surface inspection and the size inspection. The equipment commonly used of the domestic ultrasonic inspection of contrast, all can not satisfy its requirement of detecting a flaw, use special equipment to carry out ultrasonic inspection, the price is high (every tub of expense thousands yuan of detecting a flaw, the cost is too high, the enterprise can't bear), purchase professional equipment and carry out the standard improvement system, the cycle length, the expense is high, must not repay, can only stand up current equipment and carry out technological improvement and process optimization, satisfy the ultrasonic inspection demand of this model seamless steel pipe, and current ultrasonic inspection equipment can not satisfy the nondestructive inspection demand of this model seamless steel pipe, the main problem is:
1) the specification and the technical requirement of the large-caliber flaw detection equipment are both not suitable: the specification of the seamless steel pipe is phi 68.3 x 1.3mm, the operation is carried out in large-caliber ultrasonic flaw detection equipment which is suitable for the external diameter specification of a product, the application range of the equipment is phi 32 x 2-phi 159 x 15mm, but the thickness of the wall of the seamless steel pipe is 1.3mm, and the requirement of the minimum specification of the equipment is not met; meanwhile, the flaw detection requirements of the product (the depth of an artificial sample wound is 0.072mm, the length of the artificial sample wound is 5.0mm) are also higher than the minimum requirements of the equipment (the shallowest artificial sample wound is 0.20mm, and the shortest artificial sample wound is 20 mm); although the nondestructive inspection requirement of the seamless steel pipe of the type can be met by improving the technology of the equipment, the coupling is not stable after the test, and the equipment cannot be applied;
2) the single-channel flaw detection equipment is suitable in precision, but the specification is not suitable: the detection precision of the single-channel flaw detection equipment meets the requirement of the product, but the detection specification application range is phi 12 x 0.5-phi 42 x 2.0mm, the model seamless steel pipe is phi 68.5 x 1.3mm, the wall thickness is suitable, but the outer diameter exceeds the maximum outer diameter of the equipment by 26.5 mm;
3) the manual flaw detection efficiency and precision are not satisfied: the mode is not limited by the appearance and specification of the seamless steel tube, manual flaw detection is carried out by operators along the length direction of the seamless steel tube, but the manual flaw detection has huge missed detection risks and is low in efficiency.
In conclusion, due to the particularity of the seamless steel pipe of the type, the current nondestructive inspection equipment cannot meet the requirement of ultrasonic inspection, special equipment is purchased or entrusted to inspect the flaw, the cost is high, the period is long, and the process control is complicated, so that the targeted technical improvement and process optimization are performed on the basis of the current single-channel ultrasonic inspection equipment, and the ultrasonic inspection requirement of the seamless steel pipe of the type is met.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide an ultrasonic flaw detection system for a nuclear-grade stainless steel outer sleeve and a flaw detection method thereof, which effectively solve the problem of ultrasonic flaw detection of the nuclear-grade stainless steel outer sleeve and realize flaw detection operation with low cost, high efficiency and high quality.
In order to achieve the purpose, the invention adopts the following technical scheme:
in one aspect, an ultrasonic inspection system for a nuclear grade stainless steel outer sleeve comprises: the probe is arranged in the box type detection mechanism, the end part of the box type detection mechanism is provided with a pipe blank aperture for the nuclear grade stainless steel outer sleeve to pass through, and the probe is a combined probe; further comprising:
an end cover arranged in the aperture of the tube blank, and a sealing ring is arranged between the end cover and the aperture of the tube blank;
the guide sleeve is arranged on the outer side surface of the end cover, and a sealing gasket is arranged between the guide sleeve and the outer side surface of the end cover;
the combined probe is a combined probe with a built-in wafer.
The end cover is a copper end cover.
The sealing ring is made of corrosion-resistant polymer materials.
The guide sleeve is connected with the outer side surface of the end cover through threads.
In another aspect, a method for ultrasonic inspection of a nuclear grade stainless steel outer sleeve includes the steps of:
1) preparing a sample tube, namely processing a seamless steel tube with the same appearance size as a nuclear-grade stainless steel seamless steel tube into the sample tube for ultrasonic flaw detection, processing an outer wall flaw in the middle of the sample tube, processing an outer wall flaw on one port of the sample tube, and processing an inner wall flaw on the other port of the sample tube;
2) debugging the sample tube on a computer, debugging the sample tube obtained in the step 1) on an ultrasonic flaw detection device, and collecting and accumulating various parameters;
3) performing static debugging, namely performing checking static debugging on the sample tube subjected to debugging in the step 2) on ultrasonic flaw detection equipment, and confirming a debugging result;
4) dynamic debugging, namely performing dynamic verification on the sample tube by adopting parameters consistent with the flaw detection to be performed, and performing conforming and transferring to formal flaw detection;
5) preparing materials, namely placing a nuclear-grade stainless steel seamless steel tube to be subjected to nondestructive flaw detection on a feeding rack of ultrasonic flaw detection equipment by adopting hoisting equipment;
6) performing flaw detection operation, namely performing ultrasonic nondestructive flaw detection quality detection on the nuclear-grade stainless steel seamless steel pipes in the step 5) one by one, and identifying parts which are abnormal or judged to be unqualified in the detection;
7) replacing a sealing ring, stopping the machine after detecting 3-7 nuclear-grade stainless steel seamless steel tubes, replacing the sealing ring at the end part of the box-type detection mechanism, and continuing nondestructive inspection operation;
8) blanking, namely hoisting the nuclear-grade stainless steel seamless steel pipe subjected to nondestructive inspection quality inspection off a discharging rack of ultrasonic inspection equipment by adopting hoisting equipment;
9) and recording and reporting, and recording and compiling a flaw detection report after the nondestructive flaw detection operation is finished.
And 3) specifically, the detection frame to be provided with the combined probe is leaned on the sample tube, the relative position of the detection frame and the sample tube is ensured to be unchanged, and the relative position of the combined probe on the detection frame and the axis of the sample tube is continuously adjusted, so that the wave height reflected by the inner wall wound and the outer wall wound on the ultrasonic flaw detection equipment meets the requirement.
The relative position, namely the eccentricity of the combined probe and the axis of the sample tube is adjusted, the incident angle of sound waves on the surface of the sample tube is changed by adjusting the relative position, and then incident longitudinal waves are changed into pure transverse waves in the wall thickness of the sample tube, and the reflection of the pure transverse waves to artificial defects on the inner wall and the outer wall of the sample tube meets the specified requirements.
And 5) drying water vapor and foreign matters in the inner hole of the nuclear-grade stainless steel seamless steel tube by adopting compressed air, feeding one by one, plugging rubber plugs at two ends of the nuclear-grade stainless steel seamless steel tube one by one before feeding, feeding the nuclear-grade stainless steel seamless steel tube one by one into a transmission mechanism, and connecting the front nuclear-grade stainless steel seamless steel tube and the rear nuclear-grade stainless steel seamless steel tube end to end.
And 6) in the operation, in order to reduce the abrasion loss of the sealing ring, the running speed of the nuclear grade stainless steel seamless steel pipe is reduced by 10-20%.
And 7) performing sealing ring replacement operation once every 3-7 nuclear grade stainless steel seamless steel pipes in the step 7) until the quality inspection of the batch of nuclear grade stainless steel seamless steel pipes is finished.
In the above technical solution, the ultrasonic flaw detection system for the nuclear-grade stainless steel outer sleeve and the flaw detection method thereof provided by the invention also have the following beneficial effects:
1) the invention has reasonable design, proper measures, good positioning and guiding effects, safety, reliability, practicability and high efficiency;
2) the box type detection mechanism has compact sealing compensation structure and good leakage-proof effect, ensures the water coupling stability of ultrasonic incidence, and avoids false alarm caused by the failure of detecting sound waves;
3) the invention ensures the detection sound path coverage by using the stability of the rotary pitch of the combined probe, eliminates the detection blindness and improves the detection quality of flaw detection;
4) on the basis of not changing the properties of the original equipment, the invention implements local adaptability improvement, has little change in the whole process of flaw detection, low cost and little investment and is easy to implement on site;
5) the invention effectively solves the problem of ultrasonic flaw detection of the nuclear-grade stainless steel outer sleeve and realizes flaw detection operation with low cost, high efficiency and high quality;
6) the invention has strong universality, and has certain reference and application values for the corresponding improvement of other similar flaw detection equipment;
7) the invention provides experience, accumulates data and lays a foundation for realizing industrialization and industrialization production of the product in future.
Drawings
FIG. 1 is a schematic view of an ultrasonic inspection apparatus performing inspection;
FIG. 2 is a flowchart of a flaw detection operation performed by the ultrasonic flaw detection apparatus;
FIG. 3 is a schematic diagram of the configuration of the ultrasonic inspection system of the present invention;
FIG. 4 is a side view of the ultrasonic inspection system of FIG. 3;
FIG. 5 is a flowchart of the flaw detection operation performed by the ultrasonic flaw detection apparatus of the present invention.
Detailed Description
The technical scheme of the invention is further explained by combining the drawings and the embodiment.
Referring to fig. 3 to 4, an ultrasonic inspection system for a nuclear-grade stainless steel outer sleeve according to the present invention includes: the box type detection mechanism 1 is a water tank, a probe is arranged in the box type detection mechanism 1, the end part of the box type detection mechanism 1 is provided with a pipe blank aperture for a nuclear grade stainless steel outer sleeve to pass through, and the pipe blank aperture meets the function that a phi 68.5mm seamless steel pipe 10 smoothly passes through the box type detection mechanism 1; the probe is a combined probe 2; further comprising:
the preferred, locate the end cover 3 in pipe aperture and form the end face compensation, copper end cover is selected for use to this end cover 3, still be equipped with sealing washer 4 between this end cover 3 and the pipe aperture, play and prevent 1 terminal surface of box detection mechanism and leak the effect that influences the sound wave coupling, the internal diameter of sealing washer 4 equals with seamless steel pipe 10's external diameter, corrosion-resistant polymer material is selected for use to sealing washer 4 material, quantity is in order to guarantee seamless steel pipe 10 not hindered and the terminal surface is watertight when 360 rotatory and horizontal displacement suitable (generally adopt 2 ~ 3, especially 3 effects are suitable).
Preferably, the guide sleeve 5 which is arranged on the outer side surface of the end cover 3 and is in threaded connection forms a guide function, so that the seamless steel tube 10 is guided to enter the box-type detection mechanism 1, and meanwhile, a sealing gasket 6 is arranged between the guide sleeve 5 and the outer side surface of the end cover 3, so that the function of preventing water leakage of the end surface is further achieved.
Preferably, the combined probe 2 adopts a combined probe with a built-in wafer, and aims to improve the precision of ultrasonic flaw detection and meet the flaw detection requirement of artificial flaws with the length less than 5 mm.
Referring to fig. 5, the present invention further provides an ultrasonic flaw detection method for a nuclear-grade stainless steel outer sleeve, including the following steps:
1) preparing a sample tube, namely processing a seamless steel tube with the same appearance size as a nuclear-grade stainless steel seamless steel tube into the sample tube for ultrasonic flaw detection, processing an outer wall flaw in the middle of the sample tube, processing an outer wall flaw on one port of the sample tube, and processing an inner wall flaw on the other port of the sample tube, wherein the sizes (depth, width and length) of the three artificial flaws are processed according to the product requirements, and the sample tube needs to be measured after being processed so as to determine whether the sample tube meets the standard requirements or not;
2) debugging the sample tube on a computer, debugging the sample tube obtained in the step 1) on an ultrasonic flaw detection device, and collecting and accumulating various parameters;
3) performing static debugging, namely performing checking static debugging on the sample tube subjected to debugging in the step 2) on ultrasonic flaw detection equipment, and confirming a debugging result; the method comprises the following steps that a detection frame provided with a combined probe is leaned on a sample tube, the relative position of the detection frame and the sample tube is ensured to be unchanged (namely the relative position of the combined probe and the sample tube is ensured to be unchanged), the relative position of the combined probe on the detection frame and the axis of the sample tube is continuously adjusted (namely the eccentricity of the combined probe and the axis of the sample tube is adjusted, the incident angle of sound waves on the surface of the sample tube is changed by adjusting the relative position, further, incident longitudinal waves are changed into pure transverse waves in the wall thickness of the sample tube, and the reflection of the pure transverse waves to artificial defects on the inner wall and the outer wall of the sample tube meets the specified requirements), so that the wave height of the inner wall injury and the outer wall injury reflected on ultrasonic;
4) dynamic debugging, namely performing dynamic verification on the sample tube by adopting parameters (sample tube parameters and equipment motion parameters) consistent with the flaw detection to be performed, and performing formal flaw detection;
5) preparing materials, namely placing nuclear-grade stainless steel seamless steel tubes to be subjected to nondestructive flaw detection on a feeding rack of ultrasonic flaw detection equipment by adopting hoisting equipment, drying water vapor and foreign matters in inner holes of the nuclear-grade stainless steel seamless steel tubes one by adopting compressed air, feeding the nuclear-grade stainless steel seamless steel tubes one by one, filling rubber plugs at two ends of the nuclear-grade stainless steel seamless steel tubes one by one before feeding (preventing the inner holes from being filled with water and influencing flaw detection), feeding the nuclear-grade stainless steel seamless steel tubes one by one into a transmission mechanism, and connecting the front nuclear-grade stainless steel seamless steel tubes and the rear nuclear-grade stainless steel seamless steel tubes;
6) performing flaw detection operation, namely performing ultrasonic nondestructive flaw detection quality detection on the nuclear-grade stainless steel seamless steel pipes in the step 5) one by one, and marking the parts which are abnormal or unqualified in detection, wherein the running speed of the nuclear-grade stainless steel seamless steel pipes is reduced by 10-20% in order to reduce the abrasion loss of sealing rings during operation;
7) replacing a sealing ring, stopping the machine after detecting 3-7 nuclear-grade stainless steel seamless steel tubes, replacing the sealing ring at the end part of a box-type detection mechanism (the sealing ring is abraded under the friction of rotation and horizontal movement of the seamless steel tubes, and needs to be replaced in time when leakage occurs), and continuing to perform nondestructive inspection operation, wherein the sealing ring replacement operation is performed once every 3-7 nuclear-grade stainless steel seamless steel tubes until the quality inspection of the batch of nuclear-grade stainless steel seamless steel tubes is finished;
8) blanking, namely, hoisting the nuclear-grade stainless steel seamless steel pipe subjected to nondestructive inspection quality inspection off a discharge rack of ultrasonic inspection equipment by adopting hoisting equipment (the qualified and unqualified seamless steel pipes need to be placed separately);
9) and recording and reporting, and recording and compiling a flaw detection report after the nondestructive flaw detection operation is finished.
According to the contents of the procedure model, the nondestructive inspection operation of the nuclear-grade stainless steel seamless steel pipe can be completed on a single-channel ultrasonic inspection device.
Example one
Taking a seamless steel pipe with the steel grade marks of 0Cr17Ni12Mo2Ti (316Ti) and the specification of phi 68.3 x 1.3mm as an example, the single-channel ultrasonic flaw detection process method (process flow) comprises the following steps:
1) preparing a sample tube, namely processing a seamless steel tube with the same appearance size as a nuclear-grade stainless steel seamless steel tube into the sample tube for ultrasonic flaw detection, processing an outer wall flaw in the middle of the sample tube, processing an outer wall flaw on one port of the sample tube, and processing an inner wall flaw on the other port of the sample tube, wherein the sizes (depth, width and length) of the three artificial flaws are processed according to the product requirements, and the sample tube needs to be measured after being processed so as to determine whether the sample tube meets the standard requirements or not;
2) debugging the sample tube on a computer, debugging the sample tube obtained in the step 1) on an ultrasonic flaw detection device, and collecting and accumulating various parameters;
3) performing static debugging, namely performing checking static debugging on the sample tube subjected to debugging in the step 2) on ultrasonic flaw detection equipment, and confirming a debugging result; the method comprises the following steps that a detection frame provided with a combined probe is leaned on a sample tube, the relative position of the detection frame and the sample tube is ensured to be unchanged (namely the relative position of the combined probe and the sample tube is ensured to be unchanged), the relative position of the combined probe on the detection frame and the axis of the sample tube is continuously adjusted (namely the eccentricity of the combined probe and the axis of the sample tube is adjusted, the incident angle of sound waves on the surface of the sample tube is changed by adjusting the relative position, further, incident longitudinal waves are changed into pure transverse waves in the wall thickness of the sample tube, and the reflection of the pure transverse waves to artificial defects on the inner wall and the outer wall of the sample tube meets the specified requirements), so that the wave height of the inner wall injury and the outer wall injury reflected on ultrasonic;
4) dynamic debugging, namely performing dynamic verification on the sample tube by adopting parameters (sample tube parameters and equipment motion parameters) consistent with the flaw detection to be performed, and performing formal flaw detection;
5) preparing materials, namely placing nuclear-grade stainless steel seamless steel tubes to be subjected to nondestructive flaw detection on a feeding rack of ultrasonic flaw detection equipment by adopting hoisting equipment, drying water vapor and foreign matters in inner holes of the nuclear-grade stainless steel seamless steel tubes one by adopting compressed air, feeding the nuclear-grade stainless steel seamless steel tubes one by one, filling rubber plugs at two ends of the nuclear-grade stainless steel seamless steel tubes one by one before feeding (preventing the inner holes from being filled with water and influencing flaw detection), feeding the nuclear-grade stainless steel seamless steel tubes one by one into a transmission mechanism, and connecting the front nuclear-grade stainless steel seamless steel tubes and the rear nuclear-grade stainless steel seamless steel tubes;
6) performing flaw detection operation, namely performing ultrasonic nondestructive flaw detection quality detection on the nuclear-grade stainless steel seamless steel pipes in the step 5) one by one, and identifying the parts which are abnormal or unqualified in detection, wherein the running speed of the nuclear-grade stainless steel seamless steel pipes is reduced by 10-20% (the normal speed is 5m/min generally, and the running speed of the nuclear-grade stainless steel seamless steel pipes is 4-4.5 m/min preferably) in order to reduce the abrasion loss of sealing rings during operation;
7) replacing a sealing ring, stopping the machine after detecting 5 nuclear-grade stainless steel seamless steel tubes, replacing the sealing ring at the end part of a box-type detection mechanism (the sealing ring is abraded under the friction of the rotation and horizontal movement of the seamless steel tubes, and needs to be replaced in time when leakage occurs), and continuing to perform nondestructive inspection operation, wherein 3 sealing rings are replaced once every 5 nuclear-grade stainless steel seamless steel tubes until the quality inspection of the nuclear-grade stainless steel seamless steel tubes in the batch is finished;
8) blanking, namely, hoisting the nuclear-grade stainless steel seamless steel pipe subjected to nondestructive inspection quality inspection off a discharge rack of ultrasonic inspection equipment by adopting hoisting equipment (the qualified and unqualified seamless steel pipes need to be placed separately);
9) and recording and reporting, and recording and compiling a flaw detection report after the nondestructive flaw detection operation is finished.
In conclusion, the ultrasonic flaw detection system for the nuclear-grade stainless steel outer sleeve and the flaw detection method thereof realize ultrasonic flaw detection on the high-end seamless steel pipe with the artificial flaw length less than or equal to 5mm, and meet the requirement of the high-end seamless steel pipe. Reasonable design, in-place measures, good positioning and guiding effects, safety, reliability, practicality, high efficiency, compact sealing and compensating structure of a box type detection mechanism (water tank), good leakage-proof effect, ensured water coupling stability of ultrasonic wave incidence, avoided false alarm caused by no-place detection sound wave, stable rotating thread pitch by using a combined probe, ensured detection sound path coverage, eliminated detection blindness, and improved flaw detection quality, and the local improvement cost is low, the investment is less, the field implementation is easy, the problem of ultrasonic flaw detection of the nuclear grade stainless steel outer sleeve is effectively solved, the flaw detection operation with low cost, high efficiency and high quality is realized, and the accumulated technical experience of industrialized production of the nuclear grade stainless steel seamless steel pipe is realized in the future, the corresponding improvement to other similar flaw detection equipment has certain reference application value, and can create economic benefits more than tens of thousands yuan per year.
It should be understood by those skilled in the art that the above embodiments are only for illustrating the present invention and are not to be used as a limitation of the present invention, and that changes and modifications to the above described embodiments are within the scope of the claims of the present invention as long as they are within the spirit and scope of the present invention.
Claims (10)
1. An ultrasonic inspection system for a nuclear grade stainless steel outer sleeve, comprising: box detection mechanism is equipped with probe, its characterized in that in the box detection mechanism: the end part of the box type detection mechanism is provided with a pipe blank aperture for the nuclear grade stainless steel outer sleeve to pass through, and the probe is a combined probe; further comprising:
an end cover arranged in the aperture of the tube blank, and a sealing ring is arranged between the end cover and the aperture of the tube blank;
the guide sleeve is arranged on the outer side surface of the end cover, and a sealing gasket is arranged between the guide sleeve and the outer side surface of the end cover;
the combined probe is a combined probe with a built-in wafer.
2. The ultrasonic inspection system of claim 1 for use with a nuclear grade stainless steel outer sleeve, wherein: the end cover is a copper end cover.
3. The ultrasonic inspection system of claim 1 for use with a nuclear grade stainless steel outer sleeve, wherein: the sealing ring is made of corrosion-resistant polymer materials.
4. The ultrasonic inspection system of claim 1 for use with a nuclear grade stainless steel outer sleeve, wherein: the guide sleeve is connected with the outer side surface of the end cover through threads.
5. The ultrasonic inspection method for the nuclear grade stainless steel outer sleeve according to any one of claims 1 to 4, comprising the steps of:
1) preparing a sample tube, namely processing a seamless steel tube with the same appearance size as a nuclear-grade stainless steel seamless steel tube into the sample tube for ultrasonic flaw detection, processing an outer wall flaw in the middle of the sample tube, processing an outer wall flaw on one port of the sample tube, and processing an inner wall flaw on the other port of the sample tube;
2) debugging the sample tube on a computer, debugging the sample tube obtained in the step 1) on an ultrasonic flaw detection device, and collecting and accumulating various parameters;
3) performing static debugging, namely performing checking static debugging on the sample tube subjected to debugging in the step 2) on ultrasonic flaw detection equipment, and confirming a debugging result;
4) dynamic debugging, namely performing dynamic verification on the sample tube by adopting parameters consistent with the flaw detection to be performed, and performing conforming and transferring to formal flaw detection;
5) preparing materials, namely placing a nuclear-grade stainless steel seamless steel tube to be subjected to nondestructive flaw detection on a feeding rack of ultrasonic flaw detection equipment by adopting hoisting equipment;
6) performing flaw detection operation, namely performing ultrasonic nondestructive flaw detection quality detection on the nuclear-grade stainless steel seamless steel pipes in the step 5) one by one, and identifying parts which are abnormal or judged to be unqualified in the detection;
7) replacing a sealing ring, stopping the machine after detecting 3-7 nuclear-grade stainless steel seamless steel tubes, replacing the sealing ring at the end part of the box-type detection mechanism, and continuing nondestructive inspection operation;
8) blanking, namely hoisting the nuclear-grade stainless steel seamless steel pipe subjected to nondestructive inspection quality inspection off a discharging rack of ultrasonic inspection equipment by adopting hoisting equipment;
9) and recording and reporting, and recording and compiling a flaw detection report after the nondestructive flaw detection operation is finished.
6. The ultrasonic inspection method for the nuclear grade stainless steel outer sleeve according to claim 5, wherein: and 3) specifically, the detection frame to be provided with the combined probe is leaned on the sample tube, the relative position of the detection frame and the sample tube is ensured to be unchanged, and the relative position of the combined probe on the detection frame and the axis of the sample tube is continuously adjusted, so that the wave height reflected by the inner wall wound and the outer wall wound on the ultrasonic flaw detection equipment meets the requirement.
7. The ultrasonic inspection method for the nuclear grade stainless steel outer sleeve according to claim 6, wherein: the relative position, namely the eccentricity of the combined probe and the axis of the sample tube is adjusted, the incident angle of sound waves on the surface of the sample tube is changed by adjusting the relative position, and then incident longitudinal waves are changed into pure transverse waves in the wall thickness of the sample tube, and the reflection of the pure transverse waves to artificial defects on the inner wall and the outer wall of the sample tube meets the specified requirements.
8. The ultrasonic inspection method for the nuclear grade stainless steel outer sleeve according to claim 5, wherein: and 5) drying water vapor and foreign matters in the inner hole of the nuclear-grade stainless steel seamless steel tube by adopting compressed air, feeding one by one, plugging rubber plugs at two ends of the nuclear-grade stainless steel seamless steel tube one by one before feeding, feeding the nuclear-grade stainless steel seamless steel tube one by one into a transmission mechanism, and connecting the front nuclear-grade stainless steel seamless steel tube and the rear nuclear-grade stainless steel seamless steel tube end to end.
9. The ultrasonic inspection method for the nuclear grade stainless steel outer sleeve according to claim 5, wherein: and 6) in the operation, in order to reduce the abrasion loss of the sealing ring, the running speed of the nuclear grade stainless steel seamless steel pipe is reduced by 10-20%.
10. The ultrasonic inspection method for the nuclear grade stainless steel outer sleeve according to claim 5, wherein: and 7) performing sealing ring replacement operation once every 3-7 nuclear grade stainless steel seamless steel pipes in the step 7) until the quality inspection of the batch of nuclear grade stainless steel seamless steel pipes is finished.
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