CN113418991A - Reference block and method for determining incident point of circumferential defect detection of pipe fitting - Google Patents
Reference block and method for determining incident point of circumferential defect detection of pipe fitting Download PDFInfo
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- CN113418991A CN113418991A CN202110758736.5A CN202110758736A CN113418991A CN 113418991 A CN113418991 A CN 113418991A CN 202110758736 A CN202110758736 A CN 202110758736A CN 113418991 A CN113418991 A CN 113418991A
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- curved surface
- incident point
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- defect detection
- pipe fitting
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- 230000007547 defect Effects 0.000 title claims abstract description 29
- 238000001514 detection method Methods 0.000 title claims abstract description 28
- 238000000034 method Methods 0.000 title claims abstract description 12
- 239000000523 sample Substances 0.000 claims abstract description 50
- 238000012360 testing method Methods 0.000 claims abstract description 26
- 238000005259 measurement Methods 0.000 claims abstract description 9
- 239000000463 material Substances 0.000 claims abstract description 6
- 238000004140 cleaning Methods 0.000 claims description 3
- 239000011248 coating agent Substances 0.000 claims description 3
- 238000000576 coating method Methods 0.000 claims description 3
- 239000007822 coupling agent Substances 0.000 claims description 3
- 239000002184 metal Substances 0.000 description 5
- 238000012545 processing Methods 0.000 description 5
- 238000010897 surface acoustic wave method Methods 0.000 description 3
- 238000007689 inspection Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000001902 propagating effect Effects 0.000 description 1
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Classifications
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- 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
- G01N29/30—Arrangements for calibrating or comparing, e.g. with standard objects
-
- 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
-
- 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
Abstract
The invention discloses a reference block and a method for determining incident points of circumferential defect detection of a pipe fitting, and belongs to the technical field of acoustic measurement. The reference test block comprises a test block body, and the material of the test block body is the same as that of the surface wave probe curved wedge block; the test block body is formed by continuously surrounding a first curved surface, a first plane, a second curved surface and a second plane in sequence; the curvature radius of the first curved surface and the curvature radius of the second curved surface are equal to the curvature radius of the detected pipe fitting, the axis of the second curved surface is located on the first curved surface, and the distance between the axis of the first curved surface and the axis of the second curved surface is equal to the curvature radius of the detected pipe fitting. When the reference block is used for measuring the incident point, the incident point of the ultrasonic surface wave probe can be quickly and accurately measured after the maximum echo signal of the second curved surface is obtained.
Description
Technical Field
The invention belongs to the technical field of acoustic measurement, and particularly relates to a reference block and a method for determining incident points of circumferential defect detection of a pipe fitting.
Background
The ultrasonic surface wave meets an edge when propagating on the surface of the medium, and when the curvature radius R of the edge is more than 5 times of the wavelength, the surface wave can completely and smoothly pass through; when R is gradually reduced, part of surface wave energy is reflected by the edge; when R is less than or equal to the wavelength, the energy reflected by the edge is larger. This reflective characteristic is used in ultrasonic inspection to detect defects on the surface and near-surface of the workpiece. Based on the principle, the ultrasonic surface wave can be used for detecting the surface defects of the metal workpiece. For example, flat workpieces, springs, cylindrical workpieces, turbine rotor R arcs, surface defect detection of blades.
In metal surface defect detection, ultrasonic surface waves are mostly generated from longitudinal wave mode conversion. The longitudinal wave obliquely incident on the interface when the incidence angle in the wedge is larger than the second critical angle alphaⅡWhen there is no longitudinal wave or transverse wave in the workpiece to be detected, but there is an ultrasonic surface wave on the interface between the wedge and the workpiece, and the generated incident angle α should satisfy the following formula:
wherein, CL1Representing the longitudinal wave velocity of the wedge, CS2Representing the shear wave sound velocity of the workpiece.
In the circumferential defect detection of the pipe of the conventional ultrasonic oblique probe, in order to ensure good acoustic coupling, a planar probe is frequently selected and polished to have the same curvature as the pipe to be detected, and then the detection is carried out. At the moment, the incidence point and the refraction angle of the cambered oblique probe also change. In order to accurately position the circumferential defects of the pipe, the incidence point, the K value and the front edge of the inclined probe are accurately measured by the aid of the reference block.
However, the surface-acoustic-wave probe for the detection of circumferential defects of pipes belongs to a special type of oblique probe, characterized in that: (1) the wedge of the probe is a curved surface, and (2) the K value is infinity. Different from the conventional inclined probe, the acoustic wave excited by the conventional ultrasonic inclined probe is transmitted in the workpiece, and the incident point of the acoustic wave can be measured by a metal test block; however, the surface wave excited by the ultrasonic surface wave probe for detecting the circumferential defects of the pipe propagates on the surface of the metal workpiece, and cannot be measured by a metal test block at present.
Disclosure of Invention
In order to solve the defects in the prior art, the invention aims to provide a reference block and a method for determining the incident point of the circumferential defect detection of the pipe fitting, which can quickly and accurately determine the incident point of the super surface acoustic wave probe.
The invention is realized by the following technical scheme:
the invention discloses a reference test block for determining circumferential defect detection incidence points of a pipe fitting, which comprises a test block body, wherein the material of the test block body is the same as that of a surface wave probe curved wedge block; the test block body is formed by continuously surrounding a first curved surface, a first plane, a second curved surface and a second plane in sequence; the curvature radius of the first curved surface and the curvature radius of the second curved surface are equal to the curvature radius of the detected pipe fitting, the axis of the second curved surface is located on the first curved surface, and the distance between the axis of the first curved surface and the axis of the second curved surface is equal to the curvature radius of the detected pipe fitting.
Preferably, the first plane is perpendicular to the second plane, and a straight line where the axis of the first curved surface and the axis of the second curved surface are located is parallel to the second plane.
Preferably, the arc length of the first curved surface is 1 to 1.5 times of the arc length of the surface wave probe.
Preferably, the width of the test block body is 1.5 to 2 times of the surface wave probe.
Preferably, the first curved surface is provided with an identification of the axis of the second curved surface.
Preferably, the axis of the second curved surface is located at the center of the first curved surface.
The invention discloses a method for measuring an incident point by adopting the reference block for measuring the incident point of the circumferential defect detection of the pipe fitting, which comprises the following steps of:
s1: coating a coupling agent on the first curved surface of the test block body, and tightly attaching the surface wave probe to the first curved surface;
s2: and moving the surface wave probe on the first curved surface, and marking a mark point on the surface wave probe shell corresponding to the axis of the second curved surface when the surface wave probe receives the maximum echo signal of the second curved surface, wherein the mark point is the incident point of the surface wave probe.
Preferably, before step S1, a surface cleaning procedure of the test block body is further included.
Compared with the prior art, the invention has the following beneficial technical effects:
the invention discloses a reference block for determining incident points of circumferential defect detection of pipe fittings, which can rapidly and accurately determine the incident points of ultrasonic surface wave probes by utilizing two cambered surfaces with the curvature radius equal to that of the pipe fittings to be detected on the reference block under the condition that the material of a surface wave probe curved surface wedge block is the same as that of the reference block and after maximum echo signals of the arcs on the reference block can be obtained through a system. The material of the test block body is the same as that of the surface wave probe curved wedge block, so that refraction can be avoided, and the measurement precision is improved. The test block can rapidly and accurately determine the incident point of the super surface acoustic wave probe.
Furthermore, the first plane is perpendicular to the second plane, and the straight line where the axle center of the first curved surface and the axle center of the second curved surface are located is parallel to the second plane, so that the size of the reference block can be reduced according to the geometric dimension relation, and the processing amount and the processing difficulty are reduced.
Furthermore, the arc length of the first curved surface is 1-1.5 times of the arc length of the surface wave probe, so that the surface wave probe can be ensured to have enough moving distance and move stably.
Furthermore, the width of the test block body is 1.5-2 times of that of the surface wave probe, so that the surface wave probe can be ensured to have a sufficient moving range and move stably.
Furthermore, the first curved surface is provided with an identification of the axis of the second curved surface, so that an operator can observe the mark conveniently.
Furthermore, the axis of the second curved surface is positioned at the center of the first curved surface, so that the processing and the subsequent operation are convenient, and the size of the reference block can be reduced.
The invention discloses a method for measuring the incident point by adopting the reference block for measuring the circumferential defect detection incident point of the pipe fitting. The method is simple and convenient to operate, and does not depend on experience and skill level of operators; the measured incident point is accurate and is suitable for popularization and application.
Drawings
FIG. 1 is a schematic view of a system for incident point determination of circumferential defect detection of a pipe fitting according to the present invention;
FIG. 2 is a schematic front view of a reference block of the present invention.
In the figure: 1 is a surface wave probe, 2 is a test block body, 3 is an ultrasonic detection instrument, and 4 is a signal wire.
Detailed Description
The invention will now be described in further detail with reference to the drawings and specific examples, which are given by way of illustration and not by way of limitation.
Referring to fig. 2, the reference block for determining the incident point of the circumferential defect detection of the tube according to the present invention includes a block body 2, wherein the block body 2 is made of the same material as the curved wedge of the surface wave probe 1; the test block body 2 is formed by continuously surrounding a first curved surface AB, a first plane BC, a second curved surface CD and a second plane AD in sequence; radius of curvature O of first curved surface AB1And a second curved surfaceRadius of curvature O of CD2The radius of curvature of the pipe fitting to be detected is equal, the axis of the second curved surface CD is positioned on the first curved surface AB, and the distance between the axis of the first curved surface AB and the axis of the second curved surface CD is equal to the radius of curvature of the pipe fitting to be detected.
In a preferred embodiment of the present invention, a straight line where the axis of the first curved surface AB and the axis of the second curved surface CD are located is parallel to the second plane AD. The size design can reduce the size of the reference block, and reduce the processing amount and the processing difficulty.
In a preferred embodiment of the present invention, the arc length of the first curved surface AB is 1 to 1.5 times the arc length of the surface wave probe 1.
In a preferred embodiment of the present invention, the width of the test block body 2 is 1.5 to 2 times that of the surface wave probe 1.
In a preferred embodiment of the present invention, the first curved surface AB is provided with a mark for the axis of the second curved surface CD, and the mark can be dyed with a striking color.
In a preferred embodiment of the present invention, the axis of the second curved surface CD is located at the center of the first curved surface AB.
The incident point determination method for the reference block for determining the incident point of the circumferential defect detection of the pipe fitting comprises the following steps of:
s0: as shown in fig. 1, first, a surface wave probe 1 is connected to an ultrasonic inspection apparatus 3 through a signal line 4; cleaning the surface of the test block body 2;
s1: coating a coupling agent on the first curved surface AB of the test block body 2, and tightly attaching the surface wave probe 1 to the first curved surface AB to ensure that the surface wave probe 1 is well coupled with the test block body 2;
s2: moving the surface wave probe 1 on the first curved surface AB, when the surface wave probe 1 receives the maximum echo signal of the second curved surface CD, the ultrasonic wave path excited by the surface wave probe 1 passes through the incident point and the axis of the second curved surface CD of the reference block 2, and the position corresponding to the axis of the second curved surface CD is the incident point of the surface wave probe; and then marking on the shell of the surface wave probe 1 corresponding to the axis of the second curved surface CD, wherein the marked point is the incident point of the surface wave probe 1.
It should be noted that the above description is only a part of the embodiments of the present invention, and equivalent changes made to the system described in the present invention are included in the protection scope of the present invention. Persons skilled in the art to which this invention pertains may substitute similar alternatives for the specific embodiments described, all without departing from the scope of the invention as defined by the claims.
Claims (8)
1. A reference block for detecting incidence points of circumferential defect detection of a pipe fitting is characterized by comprising a test block body (2), wherein the material of the test block body (2) is the same as that of a curved wedge block of a surface wave probe (1); the test block body (2) is formed by continuously surrounding a first curved surface, a first plane, a second curved surface and a second plane in sequence; the curvature radius of the first curved surface and the curvature radius of the second curved surface are equal to the curvature radius of the detected pipe fitting, the axis of the second curved surface is located on the first curved surface, and the distance between the axis of the first curved surface and the axis of the second curved surface is equal to the curvature radius of the detected pipe fitting.
2. The reference block for incident point measurement of circumferential defect detection of pipe fittings according to claim 1, wherein the first plane is perpendicular to the second plane, and a straight line where the axis of the first curved surface and the axis of the second curved surface are located is parallel to the second plane.
3. The reference block for incident point detection of circumferential defect detection of pipe fitting of claim 1, wherein the arc length of the first curved surface is 1 to 1.5 times the arc length of the surface wave probe (1).
4. The reference block for incident point measurement of circumferential defect detection of pipe fitting according to claim 1, wherein the width of the block body (2) is 1.5-2 times of the surface wave probe (1).
5. The reference block for incident point measurement of circumferential defect detection of pipe fittings according to claim 1, wherein the first curved surface is provided with an identification of the axis of the second curved surface.
6. The reference block for incident point measurement of circumferential defect detection of pipe fittings according to claim 1, wherein the axis of the second curved surface is located at the center of the first curved surface.
7. The incident point detection method by using the reference block for detecting the incident point of the circumferential defect detection of the pipe fitting according to any one of claims 1 to 6 is characterized by comprising the following steps:
s1: coating a coupling agent on the first curved surface of the test block body (2), and tightly attaching the surface wave probe (1) to the first curved surface;
s2: and moving the surface wave probe (1) on the first curved surface, and marking the shell of the surface wave probe (1) corresponding to the axis of the second curved surface when the surface wave probe (1) receives the maximum echo signal of the second curved surface, wherein the marked point is the incident point of the surface wave probe (1).
8. The method for incident point measurement using the reference block for incident point measurement for circumferential defect detection of pipe fittings according to claim 7, wherein before step S1, the method further comprises a surface cleaning process of the block body (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110758736.5A CN113418991A (en) | 2021-07-05 | 2021-07-05 | Reference block and method for determining incident point of circumferential defect detection of pipe fitting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110758736.5A CN113418991A (en) | 2021-07-05 | 2021-07-05 | Reference block and method for determining incident point of circumferential defect detection of pipe fitting |
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| Publication Number | Publication Date |
|---|---|
| CN113418991A true CN113418991A (en) | 2021-09-21 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110758736.5A Pending CN113418991A (en) | 2021-07-05 | 2021-07-05 | Reference block and method for determining incident point of circumferential defect detection of pipe fitting |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0545342A (en) * | 1991-08-14 | 1993-02-23 | Daido Steel Co Ltd | Sensitivity correcting method in ultrasonic surface wave flaw detection |
| CN102636576A (en) * | 2012-05-09 | 2012-08-15 | 河北省电力研究院 | Measuring method for delay and leading edge of sound-transmission-wedge surface wave probe |
| CN104297351A (en) * | 2014-10-29 | 2015-01-21 | 中广核检测技术有限公司 | Test block and method for measuring refraction angle of ultrasonic angle probe |
| CN109781860A (en) * | 2018-10-31 | 2019-05-21 | 上海船舶工艺研究所(中国船舶工业集团公司第十一研究所) | A kind of reference block and calibration method |
| CN110763768A (en) * | 2019-10-29 | 2020-02-07 | 南京迪威尔高端制造股份有限公司 | Bird-shaped test block |
-
2021
- 2021-07-05 CN CN202110758736.5A patent/CN113418991A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0545342A (en) * | 1991-08-14 | 1993-02-23 | Daido Steel Co Ltd | Sensitivity correcting method in ultrasonic surface wave flaw detection |
| CN102636576A (en) * | 2012-05-09 | 2012-08-15 | 河北省电力研究院 | Measuring method for delay and leading edge of sound-transmission-wedge surface wave probe |
| CN104297351A (en) * | 2014-10-29 | 2015-01-21 | 中广核检测技术有限公司 | Test block and method for measuring refraction angle of ultrasonic angle probe |
| CN109781860A (en) * | 2018-10-31 | 2019-05-21 | 上海船舶工艺研究所(中国船舶工业集团公司第十一研究所) | A kind of reference block and calibration method |
| CN110763768A (en) * | 2019-10-29 | 2020-02-07 | 南京迪威尔高端制造股份有限公司 | Bird-shaped test block |
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Application publication date: 20210921 |