CN114563472A - Valve sealing weld joint water coupling ultrasonic nondestructive testing method and system - Google Patents

Valve sealing weld joint water coupling ultrasonic nondestructive testing method and system Download PDF

Info

Publication number
CN114563472A
CN114563472A CN202210083369.8A CN202210083369A CN114563472A CN 114563472 A CN114563472 A CN 114563472A CN 202210083369 A CN202210083369 A CN 202210083369A CN 114563472 A CN114563472 A CN 114563472A
Authority
CN
China
Prior art keywords
water
weld
detection
weld joint
nondestructive testing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202210083369.8A
Other languages
Chinese (zh)
Inventor
邓江勇
陈振华
银帮耀
王琪
汤恒
许国琛
杨磊涛
曾勇
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
China General Nuclear Power Corp
Nanchang Hangkong University
Guangxi Fangchenggang Nuclear Power Co Ltd
Original Assignee
China General Nuclear Power Corp
Nanchang Hangkong University
Guangxi Fangchenggang Nuclear Power Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by China General Nuclear Power Corp, Nanchang Hangkong University, Guangxi Fangchenggang Nuclear Power Co Ltd filed Critical China General Nuclear Power Corp
Publication of CN114563472A publication Critical patent/CN114563472A/en
Pending legal-status Critical Current

Links

Images

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • 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
    • G01N29/04—Analysing solids
    • G01N29/043—Analysing solids in the interior, e.g. by shear waves
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B17/00—Measuring arrangements characterised by the use of infrasonic, sonic or ultrasonic vibrations
    • G01B17/02—Measuring arrangements characterised by the use of infrasonic, sonic or ultrasonic vibrations for measuring thickness
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • 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
    • G01N29/22—Details, e.g. general constructional or apparatus details
    • G01N29/24—Probes
    • G01N29/2456—Focusing probes
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • 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
    • G01N29/22—Details, e.g. general constructional or apparatus details
    • G01N29/28—Details, e.g. general constructional or apparatus details providing acoustic coupling, e.g. water
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • 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
    • G01N29/44—Processing the detected response signal, e.g. electronic circuits specially adapted therefor
    • G01N29/4463—Signal correction, e.g. distance amplitude correction [DAC], distance gain size [DGS], noise filtering
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2291/00—Indexing codes associated with group G01N29/00
    • G01N2291/02—Indexing codes associated with the analysed material
    • G01N2291/023—Solids
    • G01N2291/0234—Metals, e.g. steel
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2291/00—Indexing codes associated with group G01N29/00
    • G01N2291/02—Indexing codes associated with the analysed material
    • G01N2291/028—Material parameters
    • G01N2291/02854—Length, thickness
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2291/00—Indexing codes associated with group G01N29/00
    • G01N2291/02—Indexing codes associated with the analysed material
    • G01N2291/028—Material parameters
    • G01N2291/0289—Internal structure, e.g. defects, grain size, texture
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2291/00—Indexing codes associated with group G01N29/00
    • G01N2291/26—Scanned objects
    • G01N2291/267—Welds
    • G01N2291/2675—Seam, butt welding
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • 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

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Biochemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Acoustics & Sound (AREA)
  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)

Abstract

The invention relates to a valve seal weld joint water coupling ultrasonic nondestructive testing method and a system, the method comprises the following steps of S1, arranging a plurality of measuring points on the circumference of the weld joint; s2, detecting each measuring point of the circumference of the welding seam by adopting a special detection probe device; s3, adjusting the position and direction of a water immersion focusing probe of the special detection probe device; and S4, extracting detection signals of each measuring point, and measuring the thickness and the internal defects of the welding line at the measuring point according to the detection signals of each measuring point. The invention discloses a valve sealing weld joint water coupling ultrasonic nondestructive testing system which comprises a testing unit, a control unit and a calculating unit. The invention utilizes a special detection probe device to efficiently transmit the ultrasonic focused sound beam into the circumferential weld along the coupling water jet in a water spray coupling mode, measures the thickness and the internal defects of the weld by analyzing the correlation between the pulse characteristics of the detection signal and the weld structure, and improves the detection sensitivity and the detection precision.

Description

Valve sealing weld joint water coupling ultrasonic nondestructive testing method and system
Technical Field
The invention relates to the technical field of valve seal weld joint detection and maintenance, in particular to a valve seal weld joint water coupling ultrasonic nondestructive detection method and system.
Background
The various seal welded valves are widely applied to nuclear power systems, and in addition to normally blocking medium circulation and avoiding internal leakage, the valves also need to keep the integrity and effectiveness of boundary sealing structures such as valve fillers and valve covers, and the like, so that medium leakage is prevented. The lip welding sealing structure is adopted for sealing the valve cover of a common stop valve, and a thin sealing ring welding seam is formed by welding a lip welding groove on the boundary of the valve cover, so that a medium is prevented from leaking outside through a gap of the valve cover, and the quality of the sealing welding seam is very important for ensuring the realization of a sealing function. However, the influence of welding process fluctuation during the welding process may cause the thickness of the welding seam and internal defects to be lower, which inevitably causes the performance of the welding seam to be reduced, and further influences the operation safety of the valve. Therefore, after welding or in service, the measurement of the thickness and the internal defects of the valve sealing weld joint by the nondestructive testing technology plays an important role in the operation and maintenance of the valve and the safety guarantee of the valve.
Because the sealing weld reinforcement surface of the nuclear power valve is a convex cambered surface and the surface is rough, the ultrasonic probe is directly placed in the weld reinforcement surface, so that good acoustic coupling cannot be obtained, and ultrasonic waves cannot be effectively thrown into the interior of a weld, so that the thickness, the internal defects and the internal organization structure of the weld are difficult to measure; and because the valve is arranged on the pipeline, the problem of acoustic coupling can be solved by completely immersing the valve and the probe in the coupling liquid, but the valve and the probe are not suitable for field detection.
Disclosure of Invention
The invention aims to solve the technical problems that in the prior art, the surface acoustic coupling performance of a valve sealing weld is poor and sound waves are difficult to enter, and provides a water coupling ultrasonic nondestructive testing method and system for the valve sealing weld.
The technical scheme adopted by the invention for solving the technical problems is as follows: a water coupling ultrasonic nondestructive testing method for a valve sealing weld joint is constructed, and comprises the following steps:
s1, arranging a plurality of measuring points on the circumference of the welding seam;
s2, detecting each measuring point on the circumference of the welding seam by adopting a special detection probe device, wherein the special detection probe device comprises a water immersion focusing probe and a water jacket, and the ultrasonic detection sound beam is emitted into the welding seam along the coupling water jet in a water spray coupling mode;
s3, adjusting the position and the direction of the water immersion focusing probe of the special detection probe device to enable the central axis of the water immersion focusing probe to be vertical to the weld joint extra height surface;
and S4, extracting detection signals of each measuring point, and measuring the thickness and the internal defects of the welding line at the measuring point according to the detection signals of each measuring point.
Preferably, the step S1 specifically includes setting measuring points at intervals of 60 ° along the circumference of the weld.
Preferably, before the step S2, the method further includes exhausting air in the water jacket, and after the water jacket is filled with the coupling water, gradually reducing the water pressure while maintaining the continuity and stability of the water flow.
Preferably, the step S3 specifically includes:
s31, adjusting the position and the direction of the water immersion focusing probe, and observing the waveform amplitude of the detection signal;
and S32, enabling the reflection echo of the weld joint residual height surface to reach a peak value through fine adjustment, and enabling the central axis of the water immersion focusing probe to be perpendicular to the weld joint residual height surface.
Preferably, the step S3 is followed by: and adjusting the gain of the testing instrument to enable the reflection echo of the weld joint residual height surface to reach a set value, adding a compensation value on the basis of the set value for detecting the sensitivity, and recording a detection signal.
Preferably, the characteristic pulse of the detection signal of each measuring point comprises a probe end reflected echo F1Water reflection echo F2The reflection echo F of the slit end of the weld3And a weld bottom reflection echo F4。
Preferably, the measuring the thickness and the internal defect of the welding seam at the measuring point according to the detection signal of each measuring point comprises: according to the reflected echo F of the slit end of the welding seam3Calculating the thickness of the weld
Figure BDA0003486770060000021
Wherein c is the longitudinal wave sound velocity in the welding seam, t3Reflecting echoes F for the ends of the slits3Time of peak value of t2Reflecting echo F for water2The peak time of (c).
Preferably, in order to ensure that the thickness of the welding seam meets the requirement, a final evaluation value T of the thickness of the welding seam is determinedEvaluation of＝T-0.06。
Preferably, the longitudinal wave sound velocity c in the weld joint is corrected by comparing with a metallographical measurement result.
The invention also constructs a valve seal weld joint water coupling ultrasonic nondestructive testing system, which comprises:
the detection unit is used for detecting each measuring point on the circumference of the welding seam;
the control unit is used for adjusting the position and the direction of a water immersion focusing probe of the special detection probe device to ensure that the central axis of the water immersion focusing probe is vertical to the weld joint residual height surface;
and the computing unit is used for extracting the detection signals of the measuring points and measuring the thickness and the internal defects of the welding seams at the measuring points according to the detection signals of the measuring points.
The implementation of the invention has the following beneficial effects: the invention utilizes a special detection probe device to efficiently transmit the ultrasonic focused acoustic beam into the circumferential weld along the coupling water jet in a water spray coupling mode, measures the thickness and the internal defects of the weld by analyzing the correlation between the pulse characteristics of the detection signal and the structure of the weld, and improves the detection sensitivity and the detection precision.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a schematic diagram of the valve seal weld water coupling ultrasonic nondestructive testing method of the present invention;
FIG. 2 is a schematic view of measuring point selection in the valve seal weld water coupling ultrasonic nondestructive testing method of the present invention;
FIG. 3 is a schematic structural diagram of a dedicated test probe apparatus of the present invention;
FIG. 4 is a schematic diagram of the water-coupled ultrasonic nondestructive testing method for the valve sealing weld joint of the present invention;
FIG. 5 is a schematic view of the installation position of the dedicated test probe unit of the present invention;
FIG. 6 is a schematic diagram of the detection of the valve seal weld joint water coupling ultrasonic nondestructive detection method of the present invention;
FIG. 7 is a characteristic diagram of the No. 3 measuring point detection signal of the valve sealing weld joint water coupling ultrasonic nondestructive detection method of the present invention;
FIG. 8 is a characteristic diagram of the No. 4 measuring point detection signal of the valve sealing weld joint water coupling ultrasonic nondestructive detection method of the present invention;
FIG. 9 is a weld metallographic image of station # 3 in comparison to the present invention;
FIG. 10 is a weld metallographic image of station No. 4 in comparison to the invention;
FIG. 11 is a comparison of the results of the valve seal weld water-coupled ultrasonic nondestructive testing method of the present invention with the results of the metallographic method;
FIG. 12 is a schematic view of a valve seal weld water-coupled ultrasonic non-destructive inspection system of the present invention.
Detailed Description
For a more clear understanding of the technical features, objects and effects of the present invention, embodiments of the present invention will now be described in detail with reference to the accompanying drawings. In the following description, it is to be understood that the orientations and positional relationships indicated by "front", "rear", "upper", "lower", "left", "right", "longitudinal", "lateral", "vertical", "horizontal", "top", "bottom", "inner", "outer", "leading", "trailing", and the like are configured and operated in specific orientations based on the orientations and positional relationships shown in the drawings, and are only for convenience of describing the present invention, and do not indicate that the device or element referred to must have a specific orientation, and thus, are not to be construed as limiting the present invention.
It is also noted that, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," "disposed," and the like are intended to be inclusive and mean, for example, that they may be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. When an element is referred to as being "on" or "under" another element, it can be "directly" or "indirectly" on the other element or intervening elements may also be present. The terms "first", "second", "third", etc. are only for convenience in describing the present technical solution, and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated, whereby the features defined as "first", "second", "third", etc. may explicitly or implicitly include one or more of such features. 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 following description, for purposes of explanation and not limitation, specific details are set forth, such as particular system structures, techniques, etc. in order to provide a thorough understanding of the embodiments of the invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.
As shown in FIG. 1, the invention discloses a water coupling ultrasonic nondestructive testing method for a valve sealing weld joint, which comprises the following steps:
s1, arranging a plurality of measuring points on the circumference of the welding seam; specifically, the measuring points are selected as shown in fig. 2, and one point is arranged at intervals of 60 degrees along the circumference of the welding line.
S2, detecting each measuring point on the circumference of the welding seam by adopting a special detecting probe device, wherein as shown in figure 3, the special detecting probe device 1 comprises a water immersion focusing probe 11 and a water jacket 12; the special detection probe device enables the ultrasonic detection sound beam to enter the inside of the welding seam through the coupling water jet in a water spraying coupling mode, and effectively improves detection sensitivity and detection precision. The ultrasonic detection sound beam is coupled and incident into the circumferential weld through the water jet flow, the acoustic coupling characteristic is good and stable, the focusing probe is adopted to emit the focused sound beam, the sound field capability can be further improved, and the high-sensitivity and high-precision measurement of the thickness and the internal defects of the weld is realized together.
As shown in fig. 4, specifically, the special detection probe device 1 is connected with the test instrument main unit 100 through a radio frequency signal line, is fixed on a hand wheel connecting rod of the valve 200 through a connecting mechanism 2, can adjust the direction of the special detection probe device through the connecting mechanism, and conveys water to the water jacket 12 through a water pump and sprays the water to the surface of a weld joint from a water spraying end; an ultrasonic probe 11 in the water jacket 12 transmits ultrasonic waves to be incident into a weld joint through coupling water, wherein the ultrasonic probe can be a water immersion focusing probe; the coupling water collector 3 is hung on a pipeline, and coupling water flows into the coupling water collector 3 from the front end of the probe 11 along the valve 200 and is pumped back into the water tank 4 through a water pump, so that water circulation is realized.
Further, before step S2, the method further includes exhausting air in the water jacket, connecting the water pump and the water jacket through a hose, turning on the water pump and adjusting the water pressure to the maximum to exhaust air in the water jacket 12, and after the water jacket 12 is filled with the coupling water, gradually reducing the water pressure and maintaining the continuity and stability of the water flow; discharging the air in the water jacket 12; after the water jacket 12 is filled with coupling water, the water pressure is gradually reduced to a minimum while maintaining the continuity and stability of the water flow.
S3, adjusting the position and direction of a water immersion focusing probe of the special detection probe device to enable the central axis of the water immersion focusing probe to be vertical to the extra height surface of the welding seam;
as shown in fig. 5, further, step S3 specifically includes:
s31, adjusting the position and direction of the water immersion focusing probe, and observing the waveform amplitude of the detection signal;
and S32, enabling the reflection echo of the weld joint residual height surface to reach a peak value through fine adjustment, and enabling the central axis of the water immersion focusing probe to be perpendicular to the weld joint residual height surface.
Step S3 is followed by: and adjusting the gain of the testing instrument to enable the reflection echo of the welding seam extra-high surface to reach a set value, namely 80% of the full screen, increasing a compensation value 12dB on the basis of the set value for detecting sensitivity, and recording a detection signal.
And S4, extracting detection signals of each measuring point, and measuring the thickness and the internal defects of the welding line at the measuring point according to the detection signals of each measuring point. Analyzing the correlation between the pulse characteristics of the detection signal and the structure of the welding seam, and accurately determining the thickness and the internal defects of the welding seam by accurately positioning the pulse peak time position in the detection signal;
specifically, as shown in fig. 6, the characteristic pulse of the detection signal of each measuring point comprises a probe end reflected echo F1Water reflection echo F2The reflection echo F of the slit end of the weld3And a weld bottom reflection echo F4. Correspondingly, the probe end reflects an echo F1Is set to t1Water reflection echo F2Is set to t2The reflection echo F of the slit end of the weld3Is set to t3And a weld bottom reflection echo F4Is set to t4The pulse arrival time is the peak time of the pulse wave.
Further, the step of measuring the thickness and the internal defects of the welding line at the measuring point according to the detection signal of each measuring point specifically comprises the following steps: echo F reflected from slit end of weld3Calculating the thickness of the weld
Figure BDA0003486770060000061
Wherein c is the longitudinal wave sound velocity in the welding seam, t3Reflecting echoes F for the ends of the slits3Time of peak value of t2As water reflection echo F2The peak time of (c).
Further, the average error between the measured value of 0.06mm and the gold phase value (actual value) measured by the metallographic method is obtained according to the detection test analysis, so that the final evaluation value of the weld thickness is determined to ensure that the weld thickness meets the requirement
TEvaluation of＝T-0.06 (2)；
According to the formula (2), the weld thickness evaluation value TEvaluation ofAs shown in table 1.
TABLE 1 weld thickness measurement T and evaluation TEvaluation of(mm)
Figure BDA0003486770060000062
Figure BDA0003486770060000071
And further, comparing the measured result with a metallographic method, correcting the longitudinal wave sound velocity c in the welding seam, reducing detection errors, ensuring the reliability of the thickness of the welding seam and the evaluation value of the internal defect, and correcting the sound velocity to obtain the longitudinal wave sound velocity c in the welding seam which is 5120 m/s.
As shown in FIGS. 7 to 8, for the results of thickness measurement by the method of the present invention, t is measured by calculating the measured value of "t" at the measuring point No. 33-t2T is calculated at the measuring point No. 4 at 0.7 μ s3-t2It was 0.77. mu.s. The average sound velocity c measured by the experiment was 5120 m/s. According to the formula (1), the thickness T of the weld at the measuring point No. 3 is 1.79mm, and the thickness T of the weld at the measuring point No. 4 is 1.97 mm. And similarly, the thickness of the welding seam of other measuring points can be measured by adopting the same method.
In the prior art, the circumferential weld is cut, and the thickness and the internal defects of the weld of each measuring point are measured by a metallographic method to verify the thickness measurement result of the ultrasonic nondestructive testing. The cross-section metallographic images of the No. 3 and No. 4 weld joints are shown in FIGS. 9-10, and the metallographic measurement results of the No. 3 and No. 4 weld joints are 1.79mm and 1.91mm, respectively.
As shown in FIG. 11, the ultrasonic measured value and the metallographic measured value of the weld at each measuring point are compared, the ultrasonic thickness measurement value and the metallographic measured value have good consistency, the maximum error is 0.11, and the average error is 0.06 mm. The special probe and the detection method for the valve sealing weld joint water coupling ultrasonic nondestructive thickness measurement can well measure the thickness and the internal defects of the valve sealing weld joint and meet the detection requirements of the thickness and the internal defects of the nuclear power valve sealing weld joint.
Completely, a set of valve sealing weld joint water coupling ultrasonic nondestructive testing system can be formed by integrating software and hardware, the system is applied and demonstrated in a test point power plant, and the optimization improvement of the system is gradually perfected according to a feedback result through on-site joint debugging testing of a nuclear power plant to form a set of system solution.
Therefore, as shown in fig. 12, the present invention further discloses a valve seal weld water coupling ultrasonic nondestructive testing system, which includes:
the detection unit is used for detecting each measuring point on the circumference of the welding seam;
the control unit is used for adjusting the position and the direction of the water immersion focusing probe of the special detection probe device to ensure that the central axis of the water immersion focusing probe is vertical to the weld joint residual height surface; the position and the direction of the water immersion focusing probe can be adjusted according to a control signal of the control unit, the control unit can record the parameters of the position and the direction of the water immersion focusing probe and carry out fine adjustment according to parameter data, and the position of the probe is conveniently and accurately aligned; and
and the computing unit extracts the detection signals of the measuring points and measures the thickness and the internal defects of the welding line at the measuring points according to the detection signals of the measuring points. The calculation unit can input a calculation formula in advance and calculate according to the data detected by the detection unit; or the calculation unit can directly perform calculation processing on the data detected by the detection unit, and simultaneously adjust the calculation mode, so that the accuracy is improved.
The implementation of the invention has the following beneficial effects:
the invention realizes the detection of the valve annular sealing weld by using a special detection probe device; the ultrasonic focused sound beam is efficiently transmitted into the circumferential weld along the coupling water jet in a water spray coupling mode, so that the detection sensitivity and the detection precision are greatly improved; deeply analyzing the correlation between the pulse characteristics of the detection signal and the structure of the welding seam, and accurately determining the thickness and the internal defects of the welding seam by accurately positioning the time position of the pulse peak value in the detection signal; the measured value is corrected by correcting the sound velocity and analyzing the error of the measured value, the maximum measurement error is less than or equal to 0.06mm, and the reliability of the thickness of the welding line and the evaluation value of the internal defect is ensured.
It is to be understood that the foregoing examples, while indicating the preferred embodiments of the invention, are given by way of illustration and description, and are not to be construed as limiting the scope of the invention; it should be noted that, for those skilled in the art, the above technical features can be freely combined, and several changes and modifications can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention; therefore, all equivalent changes and modifications made within the scope of the claims of the present invention should be covered by the claims of the present invention.

Claims (10)

1. A valve seal weld joint water coupling ultrasonic wave nondestructive testing method is characterized by comprising the following steps:
s1, arranging a plurality of measuring points on the circumference of the welding seam;
s2, detecting each measuring point on the circumference of the welding seam by adopting a special detection probe device, wherein the special detection probe device comprises a water immersion focusing probe and a water jacket, and the ultrasonic detection sound beam is emitted into the welding seam along the coupling water jet in a water spray coupling mode;
s3, adjusting the position and the direction of the water immersion focusing probe of the special detection probe device to enable the central axis of the water immersion focusing probe to be vertical to the weld joint extra height surface;
and S4, extracting detection signals of each measuring point, and measuring the thickness and the internal defects of the welding line at the measuring point according to the detection signals of each measuring point.
2. The method for nondestructive testing of valve seal weld by water coupling ultrasonic wave according to claim 1, wherein the step S1 specifically includes setting test points at intervals of 60 ° along the circumference of the weld.
3. The method for nondestructive testing of valve sealing weld by using water coupling ultrasonic waves as claimed in claim 1, wherein before step S2, the method further comprises exhausting air from the water jacket, and after the water jacket is filled with coupling water, the water pressure is gradually reduced while the water flow is kept continuous and stable.
4. The method for nondestructive testing of valve seal weld by water coupling ultrasonic waves as claimed in claim 1, wherein the step S3 specifically includes:
s31, adjusting the position and the direction of the water immersion focusing probe, and observing the waveform amplitude of the detection signal;
and S32, enabling the reflection echo of the weld joint residual height surface to reach a peak value through fine adjustment, and enabling the central axis of the water immersion focusing probe to be perpendicular to the weld joint residual height surface.
5. The method for nondestructive testing of valve seal weld by water coupling ultrasonic wave according to claim 1, wherein the step S3 is followed by the steps of: and adjusting the gain of the testing instrument to enable the reflection echo of the weld joint residual height surface to reach a set value, adding a compensation value on the basis of the set value for detecting the sensitivity, and recording a detection signal.
6. The valve seal weld water coupling ultrasonic nondestructive testing method as claimed in claim 1 wherein the characteristic pulse of the test signal at each measuring point comprises probe end reflected echo F1Water reflection echo F2The reflection echo F of the slit end of the weld3And a weld bottom reflection echo F4。
7. The valve seal weld water coupling ultrasonic nondestructive testing method according to claim 6, wherein the step of measuring the weld thickness and internal defects at the measuring points according to the detection signals at the measuring points comprises the steps of: according to the reflected echo F of the slit end of the welding seam3Calculating the thickness of the weld
Figure FDA0003486770050000021
Wherein c is the longitudinal wave sound velocity in the welding seam, t3Reflecting echoes F for the ends of the slits3Time of peak value of t2As water reflection echo F2The peak time of (c).
8. The valve seal weld joint water coupling ultrasonic nondestructive testing method according to claim 7, characterized in that, in order to ensure that the weld joint thickness and the internal defects meet the requirements, the final evaluation value T of the weld joint thickness is determinedEvaluation of＝T-0.06。
9. The valve seal weld water coupling ultrasonic nondestructive testing method of claim 7 wherein the longitudinal sonic velocity c in the weld is corrected by comparison with metallographic measurements.
10. The utility model provides a valve seal welding seam water coupling ultrasonic wave nondestructive test system which characterized in that includes:
the detection unit is used for detecting each measuring point on the circumference of the welding seam;
the control unit is used for adjusting the position and the direction of a water immersion focusing probe of the special detection probe device to ensure that the central axis of the water immersion focusing probe is vertical to the weld joint residual height surface;
and the computing unit extracts the detection signals of the measuring points and measures the thickness and the internal defects of the welding seams at the measuring points according to the detection signals of the measuring points.
CN202210083369.8A 2022-01-07 2022-01-25 Valve sealing weld joint water coupling ultrasonic nondestructive testing method and system Pending CN114563472A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN202210016789 2022-01-07
CN2022100167894 2022-01-07

Publications (1)

Publication Number Publication Date
CN114563472A true CN114563472A (en) 2022-05-31

Family

ID=81713219

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202210083369.8A Pending CN114563472A (en) 2022-01-07 2022-01-25 Valve sealing weld joint water coupling ultrasonic nondestructive testing method and system

Country Status (1)

Country Link
CN (1) CN114563472A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115575498A (en) * 2022-10-09 2023-01-06 哈尔滨工业大学 Ultrasonic online detection method for weld defects of aircraft tire welding ring core

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115575498A (en) * 2022-10-09 2023-01-06 哈尔滨工业大学 Ultrasonic online detection method for weld defects of aircraft tire welding ring core

Similar Documents

Publication Publication Date Title
US5497662A (en) Method and apparatus for measuring and controlling refracted angle of ultrasonic waves
US11353430B2 (en) Phased array probe and method for testing a spot-weld
US7823451B2 (en) Pulse echo/through transmission ultrasonic testing
US9121817B1 (en) Ultrasonic testing device having an adjustable water column
CN105699492A (en) An ultrasonographic method used for weld seam detection
CN110007003A (en) Partition method for the non-homogeneous metal thick plate welding-seam phased array supersonic detection of the velocity of sound
KR20100045284A (en) Calibration block (reference block) and calibration procedure for phased-array ultrasonic inspection
CN106680374A (en) Phased array ultrasonic imaging detection method for large-diameter and thick-wall alloy steel weld with stainless steel surfacing layer
CN108562647A (en) The polyethylene pipe hot melt banjo fixing butt jointing supersonic detection device and method that PA-TOFD is combined
CN102507734A (en) Ultrasonic time-of-flight diffraction (TOFD) detection method for weld seam
CN105021142A (en) Measuring method of laser lap joint welding seam width and device used by method
CN201218806Y (en) Ultrasonic detection apparatus for pipe butt-joint seam
CN110208384A (en) A kind of workpiece surface is open the measurement method at oblique flaw height and inclination angle
KR20100124242A (en) Calibration block (reference block) and calibration procedure for phased-array ultrasonic inspection
CN110988139A (en) Phased array ultrasonic detection method for welding buoy base plate and sampan
US5665893A (en) Reference block for determining operating characteristics of ultrasonic transducer in right circular cylinder type probe
CN106841392A (en) A kind of phased array ultrasonic detecting method for nuclear power station BOSS weld seams
US6125704A (en) Ultrasonic technique for inspection of weld and heat-affected zone for localized high temperature hydrogen attack
CN114563472A (en) Valve sealing weld joint water coupling ultrasonic nondestructive testing method and system
CN113834874B (en) Method for simulating and analyzing joint fillet weld defects based on CIVA
JPH02120659A (en) Non-destructive dimensions and defect inspection for thin tube weld part
KR20100124238A (en) Calibration block (reference block) and calibration procedure for phased-array ultrasonic inspection
CN110988132A (en) Welding seam single-side TOFD detection method
JPS6315104A (en) Inner-hole mapping device and method
US11933766B2 (en) Material profiling for improved sizing accuracy

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination