CN110231398A - A kind of simulating test pieces for lead sealing Defect With Eddy Current Testing and preparation method thereof and application - Google Patents
A kind of simulating test pieces for lead sealing Defect With Eddy Current Testing and preparation method thereof and application Download PDFInfo
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- CN110231398A CN110231398A CN201910641103.9A CN201910641103A CN110231398A CN 110231398 A CN110231398 A CN 110231398A CN 201910641103 A CN201910641103 A CN 201910641103A CN 110231398 A CN110231398 A CN 110231398A
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- lead sealing
- eddy current
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/72—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables
- G01N27/82—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws
- G01N27/90—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws using eddy currents
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/72—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables
- G01N27/82—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws
- G01N27/90—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws using eddy currents
- G01N27/9006—Details, e.g. in the structure or functioning of sensors
Abstract
The present invention relates to power cable lead sealing quality testing field technical fields, more particularly, to simulating test pieces of lead sealing Defect With Eddy Current Testing and preparation method thereof and application.It include: test block substrate, insulation material layer and defect sturcture；Defect sturcture is provided on test block substrate, and insulation material layer is covered in defect sturcture and test block substrate；Defect sturcture is eight grooves, respectively first to the 8th groove, wherein, first to fourth groove sequence in a manner of being parallel to the four edges of square arranges, 5th to the 8th groove sequence in a manner of being parallel to the four edges of square arranges, and the 5th to the 8th groove be respectively positioned on the inside of first to fourth groove, and be not connected between the first to the 8th groove；The first and third, five, seven grooves are parallel to each other, and second, four, six, eight grooves are parallel to each other.The simulating test pieces for the lead sealing Defect With Eddy Current Testing that the present invention designs are capable of material, surface state, covering insulation and the defect sturcture of the detected lead sealing of real simulation.
Description
Technical field
The present invention relates to power cable lead sealing quality testing field technical field, more particularly, to lead sealing EDDY CURRENT is lacked
Sunken simulating test pieces and preparation method thereof and application.
Background technique
In background of invention, it is only intended to increase understanding of the overall background of the invention for disclosed information, without
Necessarily it is considered as recognizing or imply that information composition has become in any form to show well known to persons skilled in the art
There is technology.
Power cable with cross-linked polyethylene insulation ontology and annex quality defect be the main reason for leading to high-tension cable failure,
For sealing lead as one of HV cable accessories in-site installation, sealing, the critical process of ground connection, the lead sealing quality formed after sealing lead is direct
Influence the safe and stable operation of high-tension cable.Once because installation quality is unqualified or operation in the factors such as stress, vibration cause lead
There is the defects of cracking, hole in envelope, easily leads to attachment watered and wetting or electrical connection is bad, insulation degree reduces, to cause
Voltage Cable Lines Construction fault trip even cable breakdown accident, causes serious economic loss.Especially high-tension cable is various connects
In the construction of head, with greater need for the lead sealing of high quality.
Power cable with cross-linked polyethylene insulation lead sealing refers to as cable accessory with alloy materials such as the slicker solders of heating and melting
Molding structure and surface pyrocondensation after blocking the gap between tail pipe end and metallic sheath cover the pyrocondensation of one layer of 3-5mm thickness
Pipe, material is mainly plastics, including PVC, ABS, EVA, the insulating materials such as PET.The technique of production lead sealing is known as warding off lead or sealing lead,
The technical process of covering pyrocondensation insulating materials is known as sheath shrinkable sleeve.In recent years, the typical lead sealing defect that the scene of the accident is collected has table
Face tool marks shape scratches, radial craze and transfiguration.Surface tool marks shape is scratched mainly from the unreachable position of lead sealing processing technology, and radial
The defects of cracking is also influenced by the factors such as stress, vibration in running not only from this reason, causes lead sealing cracking, deformation.Cause
This, it is necessary to check and evaluation is carried out to cable lead sealing quality using a kind of effectively reliable detection means, guarantees the various ends of cable
The sealing safety of head, thus the breakdown accident for avoiding cable lead sealing defect from causing.But artificial checking of seals need to strip lead sealing pyrocondensation
Set and waterproof band restore difficult, inefficiency, therefore do not remove the cable accessory lead sealing surface defect under the conditions of exterior insulation
It detects most important.
HV cable accessories lead sealing is detected in the case of exterior insulation for not removing, the detection method occurred at present is main
There are loop resistance test, the detection of X-ray digital imagery and EDDY CURRENT.However, present inventors believe that since loop resistance is tested
There are problems that completely can not effectively detecting lead sealing cracking with the detection of X-ray digital imagery, and eddy detection technology has not
Examined position influences, the apparent application advantages such as detected component, detection efficiency height are not touched in operation.Therefore, for vortex
The relation technological researching of detection HV cable accessories lead sealing is highly desirable.
Summary of the invention
For this purpose, the reason of finding after present invention research, cause the above problem is mainly: at present lead sealing EDDY CURRENT lack with
Reality is detected the material that workpiece is close and defect sturcture test block come the sensitivity check detected and the equivalent pair of defect
Than lacking test lead sealing detecting instrument performance and verifying the tool of detection process validity.Therefore, the present invention proposes that one kind is used for
Simulating test pieces of lead sealing Defect With Eddy Current Testing and preparation method thereof and application.
An object of the present disclosure: a kind of simulating test pieces for lead sealing Defect With Eddy Current Testing are provided.
Second purpose of the invention: a kind of production method of simulating test pieces for lead sealing Defect With Eddy Current Testing is provided.
Third purpose of the present invention: answering for described simulating test pieces for lead sealing Defect With Eddy Current Testing and preparation method thereof is provided
With.
For achieving the above object, the invention discloses following technical proposals:
Firstly, the present invention discloses a kind of simulating test pieces for lead sealing Defect With Eddy Current Testing, comprising: test block substrate, insulation
Material layer and defect sturcture；The defect sturcture is provided on test block substrate, the insulation material layer be covered on defect sturcture and
On test block substrate, for seal defect structure and its surface of the test block substrate at place；The defect sturcture is eight grooves, point
It Wei the first to the 8th groove, wherein the length of first to fourth groove is identical, and the length of the 5th to the 8th groove is identical, and
The length of first to fourth groove is greater than the length of the 5th to the 8th groove；The depth of first to fourth groove is successively passed
Increase, the depth of the 5th to the 8th groove is incremented by successively, and the incremental manner of the two and incremental change are identical；Described first to
Four grooves sequence in a manner of being parallel to the four edges of square arranges, and the 5th to the 8th groove is to be parallel to square
The mode sequence of four edges arranges, and the 5th to the 8th groove is respectively positioned on the inside of first to fourth groove, and first to the 8th is recessed
It is not connected between slot；Described first and third, five, seven grooves be parallel to each other, described second, four, six, eight grooves are parallel to each other.
As further technical solution, the material of the test block substrate is terne metal；Preferably mass percent is
The terne metal of 60-65% lead and the combination of 35-40% tin.The sealing lead welding rod of cable lead seal is terne metal.The fusing point of lead is
327 DEG C, the fusing point of tin is 232 DEG C.With the terne metal that the tin of 65% lead and 35% is configured to, in 180-250 DEG C of temperature
It is in semi-solid state in range, that is, similar to paste.The terne metal of this proportion have it is wider can operating temperature range, than
It is relatively appropriate for warding off lead operation.If stanniferous amount is very little, it is not easy to wipe when warding off lead and wards off molding；If stanniferous amount is too many, solder can
Operating temperature range is small, is unfavorable for warding off lead operation.
As further technical solution, the thickness of the insulation material layer can insulate according in detected high-tension cable
Material thickness selection, for example, as actually thickness of insulating layer≤3mm of detected workpiece, when≤3mm, the thickness of insulation material layer
Degree is 3mm；When 3mm < reality be detected workpiece thickness of insulating layer≤5mm when, insulation material layer with a thickness of 5mm.
As further technical solution, the material of the insulation material layer includes PVC, ABS, EVA, appointing in PET etc.
It anticipates one kind.
As further technical solution, the test block substrate is cube structure, for example, its size can be long 204-
210mm, wide 204-210mm, high 20-30mm or any other suitable size, for example, the test block substrate be arc or
Person is hemispheric, as long as being suitable for the relevant simulated defect test block of lead sealing EDDY CURRENT in protection scope.
As further technical solution, the length of first to fourth groove is 40mm, and depth is followed successively by
1mm、2mm、3mm、4mm。
As further technical solution, the length of the 5th to the 8th groove is 20mm, and depth is followed successively by
1mm、2mm、3mm、4mm。
As further technical solution, edge 40mm of first to fourth groove apart from test block substrate 1.
As further technical solution, described first and third, five, in seven grooves, the spacing between adjacent grooves is
40mm；Described second, four, six, in eight grooves, the spacing between adjacent grooves is 40mm.
As further technical solution, the surface of the depth direction of the groove and the test block substrate 1 where groove is hung down
Directly.
As further technical solution, the width of the groove is 1mm.
The characteristics of simulating test pieces that the present invention designs first is that: simulating test pieces covering insulating materials and test block substrate help
It is detected the structure of lead sealing in real simulation, the defect sturcture on simulating test pieces can effectively reflect EDDY CURRENT lead sealing defect ruler
Very little and echo equivalent size helps to ensure that the equivalent of detection sensitivity verification and defect compares, helps to ensure that test lead sealing
Detecting instrument performance and verifying detection process validity, the final effective detection for guaranteeing lead sealing surface defect.
The characteristics of simulating test pieces that the present invention designs second is that: (1) by groove be arranged to the reason of being distributed in this way be simulation
It is detected the actual defects layout on lead sealing surface, it may be possible to lateral, it is also possible to longitudinal, it is also possible to horizontal and vertical same
When it is existing, there are also lead sealing cracking directions to be commonly stretching stress, and Impact direction is generally laterally or longitudinal.(2) defect knot
There are also be to need a zero defect position to carry out such as shaking signal and background to make an uproar before lead sealing EDDY CURRENT for the such layout reasons of structure
Region is debugged in the verification of acoustical signal, and layout as the center that just the 5th to the 8th groove surrounds meets this need
It asks.(3) advantage being arranged in this way is that shaking signal, the ambient noise signal before being both able to satisfy lead sealing EDDY CURRENT verify debugging,
The verification that can be carried out flaw sensitivity again and defect size are to when evaluating, the simulating test pieces phase of debugging and defect before will test
In conjunction with substantially increasing the efficiency of detection, combined advantageous effect of the invention.
Secondly, the present invention discloses the preparation method of the simulating test pieces for lead sealing Defect With Eddy Current Testing, including as follows
Step:
(1) pore-free and substrate material uniform in material are chosen, test block substrate is processed into；
(2) defect sturcture is processed according to above-mentioned setting on the test block substrate of step (1), then in test block substrate appearance
Covering insulating material layer on face, with seal defect structure and its surface of the test block substrate at place.
As further technical solution, in step (1), the test block substrate the preparation method comprises the following steps: terne metal is existed
Terne metal substrate material is made within the scope of 185 DEG C -250 DEG C after Hybrid Heating, is then detected by ultrasonic wave or digital radial
Select pore-free and substrate material uniform in material, be cut to cuboid to get.
As further technical solution, in step (1), lacked using the precision machined method production of numerical control electric spark is described
Fall into structure.
Finally, the present invention discloses described simulating test pieces for lead sealing Defect With Eddy Current Testing and preparation method thereof in lossless inspection
Application in the fields such as survey, power cable lead sealing quality testing.
Compared with prior art, the present invention achieve it is following the utility model has the advantages that
(1) simulating test pieces for the lead sealing Defect With Eddy Current Testing that the present invention designs are capable of the material of the detected lead sealing of real simulation
Matter, surface state, covering insulation and defect sturcture.
(2) defect sturcture on the simulating test pieces that design of the present invention can effectively reflect EDDY CURRENT lead sealing flaw size and
Echo equivalent size can be efficiently used in detection sensitivity verification and defects assessment, and can be effectively used for test lead sealing detector
Device performance and verifying detection process validity.
Detailed description of the invention
The Figure of description for constituting a part of the invention is used to provide further understanding of the present invention, and of the invention shows
Examples and descriptions thereof are used to explain the present invention for meaning property, does not constitute improper limitations of the present invention.
Fig. 1 is the top view in the embodiment of the present invention 1 for the simulating test pieces of lead sealing Defect With Eddy Current Testing.
Fig. 2 is the main view in the embodiment of the present invention 1 for the simulating test pieces of lead sealing Defect With Eddy Current Testing.
Fig. 3 is the top view in the embodiment of the present invention 2 for the simulating test pieces of lead sealing Defect With Eddy Current Testing.
Fig. 4 is the effect picture that signal is shaken in the embodiment of the present invention 5.
Fig. 5 is the effect picture of 5 small-medium size defect of the embodiment of the present invention.
Fig. 6 is the effect picture of large scale defect in the embodiment of the present invention 5.
Attached drawing acceptance of the bid note respectively represents: 1- test block substrate, 2- insulation material layer, the first groove of 3-, the second groove of 4-, 5- the
Three grooves, the 4th groove of 6-, the 5th groove of 7-, the 6th groove of 8-, the 7th groove of 9-, the 8th groove of 10-.
Specific embodiment
It is noted that following detailed description is all illustrative, it is intended to provide further instruction to the present invention.Unless another
It indicates, all technical and scientific terms used herein has usual with general technical staff of the technical field of the invention
The identical meanings of understanding.
It should be noted that term used herein above is merely to describe specific embodiment, and be not intended to restricted root
According to exemplary embodiments of the present invention.As used herein, unless the context clearly indicates otherwise, otherwise singular
Also it is intended to include plural form, additionally, it should be understood that, when in the present specification using term "comprising" and/or " packet
Include " when, indicate existing characteristics, step, operation, device, component and/or their combination.
As described in background, lead sealing EDDY CURRENT lacks the material being close with practical detected workpiece and lacks at present
It falls into structure test block to compare come the sensitivity check detected and the equivalent of defect, lack test lead sealing detecting instrument performance and tests
Demonstrate,prove the tool of detection process validity.Therefore, the present invention propose a kind of simulating test pieces for lead sealing Defect With Eddy Current Testing and its
Production method is further illustrated the present invention now in conjunction with the drawings and specific embodiments.
Embodiment 1
With reference to Fig. 1 and 2, a kind of simulating test pieces for lead sealing Defect With Eddy Current Testing, comprising: test block substrate (1), insulation material
The bed of material (2) and defect sturcture；The defect sturcture is provided on test block substrate (1), and the insulation material layer (2) is covered on defect
In structure and test block substrate (1), for seal defect structure and its surface of the test block substrate (1) at place；The defect sturcture
For eight grooves, the respectively first to the 8th groove (3,4,5,6,7,8,9,10), wherein first to fourth groove (3,4,5,
6) length is identical, and the length of the 5th to the 8th groove (7,8,9,10) is identical, and the length of first to fourth groove (3,4,5,6)
Degree is greater than the length of the 5th to the 8th groove (7,8,9,10)；The depth of first to fourth groove (3,4,5,6) is successively passed
Increase, the depth of the 5th to the 8th groove (7,8,9,10) is incremented by successively, and the incremental manner of the two and incremental change are identical；Institute
It states first to fourth groove (3,4,5,6) sequence in a manner of being parallel to the four edges of square to arrange, the described 5th to the 8th
Groove (7,8,9,10) sequence in a manner of being parallel to the four edges of square arranges, and the 5th to the 8th groove (7,8,9,10)
It is respectively positioned on the inside of first to fourth groove (3,4,5,6), and is not connected between the first to the 8th groove；Described first and third,
Five, seven grooves (3,5,7,9) are parallel to each other, described second, four, six, eight grooves (4,6,8,10) are parallel to each other.
Embodiment 2
A kind of simulating test pieces for lead sealing Defect With Eddy Current Testing, with embodiment 1, difference is: referring to Fig. 3, the examination
Block substrate (1) is cube structure, having a size of long 204mm, wide 204mm, high 20mm.First to fourth groove (3,4,
5,6) length is 40mm, and depth is followed successively by 1mm, 2mm, 3mm, 4mm.5th to the 8th groove (7,8,9,10)
Length is 20mm, and depth is followed successively by 1mm, 2mm, 3mm, 4mm.First to fourth groove (3,4,5,6) distance examination
The edge 40mm of block substrate (1).Described first and third, five, in seven grooves (3,5,7,9), the spacing between adjacent grooves is
40mm；Described second, four, six, in eight grooves (4,6,8,10), the spacing between adjacent grooves is 40mm；The width of the groove
Degree is 1mm, and the depth direction of the groove is vertical with the surface of test block substrate (1) where groove.
Embodiment 3
A kind of preparation method of the simulating test pieces for lead sealing Defect With Eddy Current Testing, includes the following steps:
(1) mass percent is made to heat in 185 DEG C of -250 DEG C of temperature ranges after 65% lead and the mixing of 35% tin
At internal pore-free terne metal substrate material uniform in material, substrate material is having a size of high 22mm, long 206mm and width 206mm
Cuboid；
(2) it is former to choose pore-free substrate uniform in material for the block substrate raw material obtained with digital radial inspection testing procedure (1)
Then above-mentioned substrate material is processed into examination having a size of high 20mm long 204mm wide 204mm's with hi-precision cutting milling tools by material
Cube structure is to get test block substrate；
(3) on a face of the long 204mm and wide 204mm of the test block substrate (1) of step (2), with numerical control electric spark essence
It is close to process the first to the 8th groove, i.e. defect sturcture；
(4) insulation material layer with area is covered in the defect sturcture of step (3), the material of insulation material layer is PVC,
Up to simulating test pieces.
Embodiment 4
A kind of preparation method of the simulating test pieces for lead sealing Defect With Eddy Current Testing, includes the following steps:
(1) mass percent is made to heat in 185 DEG C of -250 DEG C of temperature ranges after 60% lead and the mixing of 40% tin
At internal pore-free terne metal substrate material uniform in material, substrate material is having a size of high 33mm, long 218mm and width 216mm
Cuboid；
(2) it is former to choose pore-free substrate uniform in material for the block substrate raw material obtained with digital radial inspection testing procedure (1)
Then above-mentioned substrate material is processed into examination having a size of high 30mm long 210mm wide 210mm's with hi-precision cutting milling tools by material
Cube structure is to get test block substrate；
(3) on a face of the long 210mm and wide 210mm of the test block substrate (1) of step (2), with numerical control electric spark essence
It is close to process the first to the 8th groove, i.e. defect sturcture；
(4) insulation material layer with area is covered in the defect sturcture of step (3), the material of insulation material layer is PET,
Up to simulating test pieces.
Embodiment 5
Using test block as described in example 2 as object, when implementing lead sealing detection with eddy detection technology, according to practical quilt
The thickness for detecting workpiece demand selection insulation material layer (2), as actually thickness of insulating layer≤3mm of detected workpiece, insulation
Material layer (2) with a thickness of 3mm, when 3mm < reality is detected thickness of insulating layer≤5mm of workpiece, insulation material layer (2)
With a thickness of 5mm.After having selected suitable insulation material layer (2), popped one's head in putting type coil in defect sturcture, i.e., the 5th to the 8th
Vortex is carried out in the center surface that groove (7,8,9,10) surrounds and shakes signal calibration (with reference to shown in Fig. 4), and probe fitting is exhausted
Edge material layer (2) test identifies shake letter after adjust the amplitude equivalent for shaking signal and background signal and angle and lacked convenient for the later period
Identification is fallen into, signal angle will be such as shaken and be adjusted to 0 ° or 180 ° of horizontality and amplitude equivalent is adjusted to two ratio circles
It is interior.Again by the eddy current probe horizontal abutment insulation material layer (2) after adjusting, the defect sturcture under insulating materials is surveyed respectively,
I.e. first to the 8th groove (3,4,5,6,7,8,9,10), the length direction for left and right moving direction square cut groove of popping one's head in, when
Detecting instrument system energy is proved when the shaking signal that defect groove eddy current amplitude equivalent and angle are calibrated before being clearly distinguishable from
Effectively detection achievees the purpose that calibrate detection sensitivity and assessment size, also realize not less than the defect of this flaw size
The verifying of lead sealing detecting instrument performance and detection process validity.With reference to Fig. 5, generated for the 5th groove (7) small sized defects
Eddy current signal waveform diagram, eddy current signal amplitude equivalent is laid out obviously pulls open up and down slightly larger than signal and signal is shaken,
Significant change occurs for angle, forms " 8 " the word flaw indication for being easy to identify；It is the 4th groove (6) large scale defect with reference to Fig. 6
The eddy current signal waveform diagram of generation, eddy current signal amplitude equivalent is significantly greater than shaking signal and signal is laid out obviously up and down
It pulls open, significant change occurs for angle, forms " 8 " the word flaw indication for being easier to identify.Small sized defects and large scale defect energy
It is enough easily to detected, and small sized defects and the amplitude equivalent and angle of large scale defect also produce obvious comparison.?
Before EDDY CURRENT lead sealing testing inspection instrument Detection capability and during detection suspect detecting instrument detectability when it is equal
It can be verified in the invention test block.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, for the skill of this field
For art personnel, the invention may be variously modified and varied.All within the spirits and principles of the present invention, made any to repair
Change, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of simulating test pieces for lead sealing Defect With Eddy Current Testing characterized by comprising test block substrate, insulation material layer
And defect sturcture；The defect sturcture is provided on test block substrate, and the insulation material layer is covered on defect sturcture and test block base
On material, for seal defect structure and its surface of the test block substrate at place；The defect sturcture is eight grooves, respectively the
One to the 8th groove, wherein the length of first to fourth groove is identical, and the length of the 5th to the 8th groove is identical, and first to
The length of 4th groove is greater than the length of the 5th to the 8th groove；The depth of first to fourth groove is incremented by successively, described
The depth of 5th to the 8th groove is incremented by successively, and the incremental manner of the two and incremental change are identical；First to fourth groove
Sequence arranges in a manner of being parallel to the four edges of square, and the 5th to the 8th groove is to be parallel to square four edges
Mode sequence arrange, and the 5th to the 8th groove is respectively positioned on the inside of first to fourth groove, and between the first to the 8th groove
It is not connected to；The first and third, five, seven grooves are parallel to each other, and second, four, six, eight grooves are parallel to each other.
2. being used for the simulating test pieces of lead sealing Defect With Eddy Current Testing as described in claim 1, which is characterized in that the test block substrate
Material be terne metal；Preferably mass percent is the terne metal that 60-65% lead and 35-40% tin combine.
3. being used for the simulating test pieces of lead sealing Defect With Eddy Current Testing as described in claim 1, which is characterized in that the insulating materials
The thickness of layer can be selected according to insulation thickness in detected high-tension cable, it is preferable that when reality is detected the exhausted of workpiece
When edge layer thickness≤3mm, when≤3mm, insulation material layer with a thickness of 3mm；When 3mm < reality is detected the insulating layer thickness of workpiece
When degree≤5mm, insulation material layer with a thickness of 5mm.
4. being used for the simulating test pieces of lead sealing Defect With Eddy Current Testing as described in claim 1, which is characterized in that the insulating materials
The material of layer includes PVC, ABS, EVA, any one in PET etc.；
Preferably, the test block substrate is cube structure, arcuate structure or hemispherical dome structure, more preferably square knot
Structure, having a size of long 204mm, wide 204mm, high 20mm.
5. being used for the simulating test pieces of lead sealing Defect With Eddy Current Testing as described in claim 1, which is characterized in that described first to the
The length of four grooves is 40mm, and depth is followed successively by 1mm, 2mm, 3mm, 4mm；
Preferably, the length of the 5th to the 8th groove is 20mm, and depth is followed successively by 1mm, 2mm, 3mm, 4mm.
6. being used for the simulating test pieces of lead sealing Defect With Eddy Current Testing as described in claim 1, which is characterized in that described first to the
Edge 40mm of four grooves apart from test block substrate 1；
Preferably, described first and third, five, in seven grooves, the spacing between adjacent grooves is 40mm；Described second, four, six, eight
In groove, the spacing between adjacent grooves is 40mm.
7. being used for the simulating test pieces of lead sealing Defect With Eddy Current Testing as described in claim 1, which is characterized in that the depth of the groove
It is vertical with the surface of test block substrate 1 where groove to spend direction；Preferably, the width of the groove is 1mm.
8. special such as the preparation method of the described in any item simulating test pieces for lead sealing Defect With Eddy Current Testing of claim 1-7
Sign is, includes the following steps:
(1) pore-free and substrate material uniform in material are chosen, test block substrate is processed into；
(2) defect sturcture is processed on the test block substrate of step (1), then the covering insulating material on test block substrate outer surface
Layer, with seal defect structure and its surface of the test block substrate at place.
9. the preparation method as claimed in claim 8, which is characterized in that in step (1), the preparation method of the test block substrate
Are as follows: terne metal substrate material is made in terne metal within the scope of 185 DEG C -250 DEG C after Hybrid Heating, then passes through ultrasonic wave
Or digital radial detection select pore-free and substrate material uniform in material, be cut to cuboid to get；
Preferably, in step (1), the defect sturcture is made using the precision machined method of numerical control electric spark.
10. as claim 1-7 is described in any item for the simulating test pieces of lead sealing Defect With Eddy Current Testing and/or such as claim
Application of the simulating test pieces of the preparation of method described in 8 or 9 in non-destructive testing, power cable lead sealing quality testing field.
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| CN201910641103.9A CN110231398B (en) | 2019-07-16 | 2019-07-16 | Simulation test block for detecting defects of lead-sealed eddy current test and manufacturing method and application thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112881532A (en) * | 2021-01-20 | 2021-06-01 | 西北工业大学 | Ultrasonic detection test block for diffusion welding lamination defects, and preparation method and application thereof |
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| CN112881532B (en) * | 2021-01-20 | 2023-02-24 | 西北工业大学 | Ultrasonic detection test block for diffusion welding lamination defects, and preparation method and application thereof |
| CN113049331A (en) * | 2021-03-12 | 2021-06-29 | 北京中实国金国际实验室能力验证研究有限公司 | Preparation method of nondestructive testing simulation test block and simulation test block |
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| CN110231398B (en) | 2023-01-31 |
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