CN109696474A - Pipeline transverse crack detection method - Google Patents
Pipeline transverse crack detection method Download PDFInfo
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- CN109696474A CN109696474A CN201811534298.9A CN201811534298A CN109696474A CN 109696474 A CN109696474 A CN 109696474A CN 201811534298 A CN201811534298 A CN 201811534298A CN 109696474 A CN109696474 A CN 109696474A
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- crack defect
- pipeline
- transversal crack
- transversal
- probe
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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
- G01N29/04—Analysing solids
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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
- G01N29/24—Probes
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- 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
Abstract
The invention discloses a kind of pipeline transverse crack detection methods, comprising steps of 1) selection probe K value is less than the probe of x, probe K value when x is primary wave and tangent inner wall of the pipe；2) pipeline is detected using the primary wave of the probe；If 3) detect the first transversal crack defect, determine that the first transversal crack defect exists.Pipeline transverse crack detection method disclosed by the invention, by selecting to pop one's head according to probe K value, it ensure that the ultrasonic wave covering pipeline that probe is issued when detecting, to ensure that the probe is able to detect that each position of pipeline, avoid occur some position detection of pipeline less than the case where, to reduce erroneous judgement probability.
Description
Technical field
The present invention relates to pipeline inspection technology fields, more specifically to a kind of pipeline transverse crack detection method.
Background technique
In engineering, need to raw material to critical piping and weld seam carry out transversal crack detection, such as it is big to four in power plant
The raw material and weld seam of pipeline (main steam line, reheaing steam pipe etc.) carry out transversal crack detection.
It is easier to judge by accident also without reference to standard currently, detecting no better method to pipeline transversal crack.Erroneous judgement
It will cause two serious consequences, first is that examining discovery transversal crack is false defect (not being the defect of necessary being), after excavating
Repair welding and heat treatment need to be carried out, consumes manpower and material resources in vain；Second is that missing inspection, i.e., existing crack defect not detected, manage
Road band crack defect is run, it may occur that explosion generates safety accident.
Therefore, how a kind of pipeline transverse crack detection method is provided, is current art technology to reduce erroneous judgement probability
Personnel's urgent problem to be solved.
Summary of the invention
The object of the present invention is to provide a kind of pipeline transverse crack detection methods, to reduce erroneous judgement probability.
To achieve the goals above, the invention provides the following technical scheme:
A kind of pipeline transverse crack detection method, comprising steps of
1) selection probe K value is less than the probe of x, probe K value when x is primary wave and tangent inner wall of the pipe；
2) pipeline is detected using the primary wave of the probe；
If 3) detect the first transversal crack defect, determine that the first transversal crack defect exists.
Preferably,
Wherein, R is the exradius of the pipeline；R is the inner circle radius of the pipeline.
Preferably, the pipeline transverse crack detection method further comprises the steps of: after the step 3)
4) according to the horizontal distance a and vertical distance b of the first transversal crack defect of the probe display, institute is calculated
State the depth h, the corresponding pipe surface point of the first transversal crack defect and the primary wave of the first transversal crack defect
Arc length L between launch point determines the position of the first transversal crack defect according to the launch point, L and h of the primary wave.
Preferably,
Wherein, R is the exradius of the pipeline.
Preferably, the pipeline transverse crack detection method further comprises the steps of: after the step 4)
5) launch point of the secondary wave of the probe is determined according to the position of the first transversal crack defect；
6) pipeline is detected using the secondary wave；
If 7) secondary wave detects the second transversal crack defect, and second transversal crack of the probe display
Described the of the horizontal distance of defect probe display identical with the horizontal distance for calculating resulting second transversal crack defect, described
The vertical distance of two transversal crack defects is identical with the vertical distance for calculating resulting second transversal crack defect, then and described first
Transversal crack defect exists through primary review.
Preferably, in the step 5),
θ '=θ1+θ2,
θ1=180- θ3-θ4,
θ2=180- θ3- α,
Wherein, L ' is the launch point of the secondary wave and the first transversal crack defect pair in the outer circle of the pipeline
The arc length between pipe surface point answered；α is the incidence angle of the secondary wave, and R is the exradius of the pipeline；R is described
The inner circle radius of pipeline.
Preferably, in the step 7),
A '=csin θ ',
B '=R-ccos θ ',
θ '=θ1+θ2,
θ1=180- θ3-θ4；
θ2=180- θ3- α,
Wherein, a ' is the horizontal distance for calculating the resulting second transversal crack defect, and b ' is to calculate resulting second
The vertical distance of transversal crack defect；α is the incidence angle of the secondary wave, and R is the exradius of the pipeline；R is the pipe
The inner circle radius in road.
Preferably, in the step 3) and the step 6), the primary wave detects that first transversal crack lacks
The launch point of launch point and the secondary wave when falling into is in the ipsilateral of the first transversal crack defect.
Preferably, the pipeline transverse crack detection method further comprises the steps of: after the step 7)
8) launch point of the primary wave of the probe is determined according to the position of the first transversal crack defect；
9) pipeline is detected using the primary wave；
If 10) primary wave detects third transversal crack defect, and the third of the probe display is laterally split
The probe display identical with the horizontal distance for calculating the resulting third transversal crack defect, described of the horizontal distance of line defect
The vertical distance of the third transversal crack defect is identical with the vertical distance for calculating the resulting third transversal crack defect,
Then the first transversal crack defect exists through secondary review；
Wherein, primary wave described in the launch point of primary wave described in the step 8) and the step 3) detects described
Launch point when the first transversal crack defect is located at the two sides of the first transversal crack defect.
Preferably, the pipeline transverse crack detection method further comprises the steps of: after the step 9)
11) launch point of the secondary wave of the probe is determined according to the position of the first transversal crack defect；
12) pipeline is detected using the secondary wave；
If 13) secondary wave detects the 4th transversal crack defect, and the 4th transversal crack of the probe display lacks
The 4th of sunken horizontal distance probe display identical with the horizontal distance for calculating the resulting 4th transversal crack defect, described
The vertical distance of transversal crack defect is identical with the vertical distance for calculating the resulting 4th transversal crack defect, then and described the
One transversal crack defect through checking presence three times；
Wherein, the launch point of primary wave described in the launch point of secondary wave described in the step 11) and the step 8)
In the ipsilateral of the first transversal crack defect.
Preferably, the pipeline transverse crack detection method further comprises the steps of: after the step 7)
8 ') launch point of the secondary wave of the probe is determined according to the position of the first transversal crack defect；
9 ') pipeline is detected using the secondary wave；
10 ') if the secondary wave detects the 4th transversal crack defect, and the 4th transversal crack of the probe display lacks
The 4th of sunken horizontal distance probe display identical with the horizontal distance for calculating the resulting 4th transversal crack defect, described
The vertical distance of transversal crack defect is identical with the vertical distance for calculating the resulting 4th transversal crack defect, then and described the
One transversal crack defect exists through secondary review；
Wherein, the step 8 ') described in secondary wave launch point and the step 3) described in primary wave detect
Launch point when one transversal crack defect is located at the two sides of the first transversal crack defect.
Pipeline transverse crack detection method provided by the invention ensure that and detect by selecting to pop one's head according to probe K value
When the issued ultrasonic wave covering pipeline of probe avoided to ensure that the probe is able to detect that each position of pipeline
Occur some position detection of pipeline less than the case where, to reduce erroneous judgement probability.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
The embodiment of invention for those of ordinary skill in the art without creative efforts, can also basis
The attached drawing of offer obtains other attached drawings.
Fig. 1 be in pipeline transverse crack detection method provided in an embodiment of the present invention primary wave with inner wall of the pipe is tangent shows
It is intended to；
Fig. 2 is in pipeline transverse crack detection method provided in an embodiment of the present invention using the schematic diagram of primary wave detection；
Fig. 3 is in pipeline transverse crack detection method provided in an embodiment of the present invention using the schematic diagram of secondary wave detection.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Pipeline transverse crack detection method provided in an embodiment of the present invention, specifically includes step:
S01: it selects to pop one's head according to probe K value:
Specifically, selection probe K value is less than the probe of x, probe K value when x is primary wave and tangent inner wall of the pipe.It can be with
Understand, when the probe K value of probe is x, the primary wave of probe and the inner wall of pipeline are tangent.
As shown in Figure 1, the circle of pipeline 12 is point O, the exradius of pipeline is R, and the inner circle radius of pipeline is r；Probe 11
The primary wave of sending and the inner wall of pipeline 12 are tangential on point Q；In right angled triangle, a right-angle side is the exradius of pipeline
R, another right-angle side are the inner circle radius r of pipeline, then can basisObtain the probe K value of the probe 11.
Certainly x can also be obtained according to the theorem of other in trigonometry, it is not limited to this.
It should be noted that probe selected by the pipeline of different tube diameters may be different, the pipe for needing to be detected as needed
The corresponding probe of road selection.
The probe of aforesaid way selection ensure that the ultrasonic wave covering pipeline for sending of popping one's head in when detecting, to ensure that
The probe is able to detect that each position of pipeline.
S02: pipeline is detected using the primary wave of probe:
It is understood that at this point, carrying out comprehensive scanning to pipeline using primary wave.
S03: if detecting the first transversal crack defect, determine that the first transversal crack defect exists.
Pipeline transverse crack detection method provided in an embodiment of the present invention ensure that by selecting to pop one's head according to probe K value
Issued ultrasonic wave of popping one's head in when detecting covers pipeline, thus ensure that the probe is able to detect that each position of pipeline,
Avoid occur some position detection of pipeline less than the case where, to reduce erroneous judgement probability.
Currently, probe can show the horizontal distance and vertical distance of the defect detected by it, in actual application
In, when detecting the first transversal crack defect, probe can show the horizontal distance a and vertical distance b of the first transversal crack defect.
It should be noted that the horizontal distance a of the first transversal crack defect, refers to the first transversal crack defect and ultrasonic wave
The horizontal distance of launch point；The vertical distance b of first transversal crack defect refers to the first transversal crack defect and ultrasonic wave transmitting
The vertical distance of point.Above-mentioned horizontal distance is distance in the horizontal direction, and vertical distance is the distance in vertical direction,
In, in the tangent line and horizontal direction parallel of ultrasonic wave launch point in pipeline outer circle.The ultrasonic wave can be primary wave, can also be two
Subwave.
For follow-up work, above-mentioned pipeline transverse crack detection method further comprises the steps of: after the step S03
S04: the position of the first transversal crack defect is determined:
As shown in Fig. 2, the launch point of the primary wave of probe 21 is point B, the circle of pipeline 22 is point O, pops one's head in the one of 21 sendings
Subwave detects the first transversal crack defect, it is assumed that the first transversal crack defect position is point A, tie point B and point O, is done
Vertical line AC ⊥ OB.Then the horizontal distance of the first transversal crack defect is AC=a, and the vertical distance of the first transversal crack defect is BC
=b.
Tie point O and point A, straight line OA and outer circle meet at point E, and the corresponding pipe surface point of the first transversal crack defect is point
E, line segment BO, line segment EO are the exradius R of pipeline 22, then the depth h of the first transversal crack defect is the length of line segment AE,
The length that arc length L between the corresponding pipe surface point of first transversal crack defect and the launch point of primary wave is segmental arc BE.
AC=a in △ AOC, OC=R-b, ∠ AOC=θ are calculated to simplify, are calculated using following formula:
It is the position that can determine the first transversal crack defect according to the launch point B, arc length L and depth h of above-mentioned primary wave
It sets.It is understood that the launch point B of above-mentioned primary wave is hair when above-mentioned primary wave detects the first transversal crack defect
Exit point.
Certainly, above-mentioned arc length L and depth h can also be obtained according to other formula, it is not limited to this.
In above-mentioned pipeline transverse crack detection method, after primary wave detects the first transversal crack defect, it is possible to exist
Erroneous judgement further decreases the probability of erroneous judgement at this point, secondary wave review can be used.
Specifically, above-mentioned pipeline transverse crack detection method further comprises the steps of: after step S04
S05: the launch point of the secondary wave of probe is determined according to the position of the first transversal crack defect:
As shown in figure 3, the center of circle of pipeline 22 is point O, the position of the first transversal crack defect has been determined in above-mentioned steps S04
As point A, the corresponding pipe surface point of the first transversal crack defect are point E, it is assumed that the launch point of secondary wave is point P, tie point O
With point P, vertical line AF ⊥ OP is.The tangent line of pipeline outer circle is done in point P and is vertical line AD ⊥ DP.
Secondary wave reaches the point H of inner wall of the pipe, then point of arrival A, and Yu Dian H is the tangent line HG of pipeline inner circle, according to ultrasound
Wave reflection criterion, it is known that ∠ OHA=∠ OHP, the incidence angle ∠ OPH=α of the secondary wave.Line segment OH is the inner circle radius r of pipeline,
Line segment OP is the exradius R of pipeline.It should be noted that the incidence angle of secondary wave is a known parameters of probe.
Since point E has been determined by step S04, then by determining the arc length L ' in the outer circle of pipeline between point E and point P i.e.
It can determine the launch point of secondary wave.It is understood that the launch point of secondary wave is two, it is located at the first transversal crack and lacks
Sunken two sides, select one of them.
If ∠ AOP=θ ', ∠ AOH=θ1, ∠ HOP=θ2, ∠ OHA=∠ OHP=θ3, ∠ OAH=θ4, OA=R-h=c,
Specifically:
θ '=θ1+θ2,
θ 1=180- θ3-θ4,
θ2=180- θ3- α,
It is understood that in △ OPH, according to sine:Then In △ OAH, according to sine:Then
Certainly, other theorems that also may be selected in trigonometry obtain θ1、θ2, it is not limited to this.
S06: pipeline is detected using secondary wave:
According to the launch point of the secondary wave determined in above-mentioned steps S05, pipeline is detected in the launch point using secondary wave.
S07: if secondary wave detects the second transversal crack defect, and the level of the second transversal crack defect of display of popping one's head in
Distance is identical with the horizontal distance for calculating resulting second transversal crack defect, the second transversal crack defect of probe display perpendicular
Straight distance is identical with the vertical distance for calculating resulting second transversal crack defect, then the first transversal crack defect is once checked
In the presence of:
It is understood that the second transversal crack defect is in the presence of the first transversal crack defect is through once checking
First transversal crack defect；In the absence of the first transversal crack defect is checked once, the second transversal crack defect is not the
One transversal crack defect.
Specifically, pop one's head in display the second transversal crack defect horizontal distance be a ", display of popping one's head in second laterally splits
The vertical distance of line defect is b "；The horizontal distance for calculating resulting second transversal crack defect is a ', calculates resulting second
The vertical distance b ' of transversal crack defect."=a ', and b "=b ', the then position of the second transversal crack defect of display of popping one's head in if a
It is identical with the position for calculating resulting second transversal crack defect.
As shown in figure 3, the formula disclosed according to above-mentioned steps S05:
A '=BD=AF=csin θ ', b '=AD=FP=R-ccos θ '.
In actual application, if probe shows other data to indicate the position of the second transversal crack defect, originally
Field technical staff can appropriate adjustment, derivation calculating is carried out according to mathematical knowledge, it is not limited to above-described embodiment.
In above-mentioned pipeline transverse crack detection method, the launch point and primary wave of secondary wave detect that the first transversal crack lacks
Sunken launch point can be in the ipsilateral of the first transversal crack defect, can also be respectively in the two sides of the first transversal crack defect.
Preferably, in above-mentioned pipeline transverse crack detection method, in step S03 and step S06, primary wave detects first
The launch point of launch point and secondary wave when transversal crack defect is ipsilateral the first transversal crack defect.Specifically, step S03
Launch point when middle primary wave detects the first transversal crack defect and with the launch point of secondary wave in step S06 first laterally
Crack defect it is ipsilateral.
In order to further optimize the above technical scheme, above-mentioned pipeline transverse crack detection method, which is characterized in that in step
7) it after, further comprises the steps of:
S08: the launch point of the primary wave of probe is determined according to the position of the first transversal crack defect；
S09: pipeline is detected using primary wave；
S010: if primary wave detects third transversal crack defect, and the water of the third transversal crack defect for display of popping one's head in
Flat distance is identical with the horizontal distance for calculating resulting third transversal crack defect, the third transversal crack defect of probe display
Vertical distance is identical with the vertical distance for calculating resulting third transversal crack defect, then the first transversal crack defect is through secondary multiple
Core exists.
Wherein, primary wave detects that first laterally splits in the launch point and above-mentioned steps S03 of primary wave in above-mentioned steps S08
Launch point when line defect is located at the two sides of the first transversal crack defect.
It is understood that third transversal crack defect is in the presence of the first transversal crack defect is through secondary review
First transversal crack defect；In the absence of the first transversal crack defect is through secondary review, third transversal crack defect is not
One transversal crack defect.
In above-mentioned steps S08, the determination of the launch point of primary wave can refer to the launch point of secondary wave in above-mentioned steps S05
Determine method.Specifically, since point E has been determined by step S04, then by determining point E and primary wave in the outer circle of pipeline
Arc length between launch point is the launch point that can determine primary wave.This is repeated no more herein.
In above-mentioned steps S010, the horizontal distance of third transversal crack defect and the calculation method of vertical distance be can refer to
The calculation method for stating the horizontal distance of the second transversal crack defect and vertical distance in step S07, herein repeats no more this.
Above-mentioned pipeline transverse crack detection method is further mentioned by carrying out secondary review using primary wave not ipsilateral
The high reliability of testing result, further reduces the probability of erroneous judgement.
Further, above-mentioned pipeline transverse crack detection method further comprises the steps of: after step 9)
S011: the launch point of the secondary wave of probe is determined according to the position of the first transversal crack defect；
S012: pipeline is detected using secondary wave；
S013: if secondary wave detects the 4th transversal crack defect, and the water of the 4th transversal crack defect of display of popping one's head in
Flat distance is identical with the horizontal distance for calculating resulting 4th transversal crack defect, the 4th transversal crack defect of probe display
Vertical distance is identical with the vertical distance for calculating resulting 4th transversal crack defect, then the first transversal crack defect is through multiple three times
Core exists.
Wherein, in above-mentioned steps S011 in the launch point and above-mentioned steps S08 of secondary wave the launch point of primary wave first
Transversal crack defect it is ipsilateral.
It is understood that the 4th transversal crack defect is in the presence of the first transversal crack defect through checking three times
First transversal crack defect；In the absence of the first transversal crack defect through checking three times, the 4th transversal crack defect is not
One transversal crack defect.
In above-mentioned steps S011, the determination of the launch point of secondary wave can refer to the launch point of secondary wave in above-mentioned steps S05
Determination method, this is repeated no more herein.
In above-mentioned steps S013, the horizontal distance of the 4th transversal crack defect and the calculation method of vertical distance be can refer to
The calculation method for stating the horizontal distance of the second transversal crack defect and vertical distance in step S07, herein repeats no more this.
Above-mentioned pipeline transverse crack detection method, by being checked not ipsilateral using primary wave, secondary wave, Zong Gongshi
Show and checked three times, to further reduce the probability of erroneous judgement.
In above-mentioned pipeline transverse crack detection method, secondary wave can also be directlyed adopt and carry out secondary review, it is specifically, above-mentioned
Pipeline transverse crack detection method further comprises the steps of: after step 6)
S08 ': the launch point of the secondary wave of probe is determined according to the position of the first transversal crack defect；
S09 ': pipeline is detected using secondary wave；
S010 ': if secondary wave detects the 4th transversal crack defect, and the water of the 4th transversal crack defect of display of popping one's head in
Prosposition sets identical with the horizontal position that calculates resulting 4th transversal crack defect, probe display the 4th transversal crack defect
Vertical position is identical with the vertical position for calculating resulting 4th transversal crack defect, then the first transversal crack defect is through secondary multiple
Core exists.
Wherein, primary wave detects that first is lateral in the launch point and above-mentioned steps S03 of the middle secondary wave of above-mentioned steps S08 '
The launch point of crack defect is located at the two sides of the first transversal crack defect.
It is understood that the 4th transversal crack defect is in the presence of the first transversal crack defect is through secondary review
First transversal crack defect；In the absence of the first transversal crack defect is through secondary review, the 4th transversal crack defect is not
One transversal crack defect.
In above-mentioned steps S010 ', the horizontal distance of the 4th transversal crack defect and the calculation method of vertical distance be can refer to
The calculation method of the horizontal distance of the second transversal crack defect and vertical distance, herein repeats no more this in above-mentioned steps S07.
In above-mentioned pipeline transverse crack detection method, the primary wave and secondary wave of use are the ultrasound of the same probe
Wave.
Formula involved in above-mentioned pipeline transverse crack detection method calculates, and calculating work is complex, can be by equation editing
In Excel table, also editable calculates small routine, facilitates calculating.
The surface of pipeline is easier to there are impurity, such as weld reinforcement, oxide skin, greasy dirt etc., these magazines will affect detection
As a result.In order to reduce influence of the impurity to detection, above-mentioned pipeline transverse crack detection method further includes step before step S02
It is rapid: the impurity of pipe surface to be cleared up, so that the surface of pipeline reaches the testing requirements of probe.For example, being detected to weld seam, answer
Remove weld reinforcement.
It is understood that above-mentioned testing requirements, are well known to those skilled in the art, this is repeated no more herein.
The foregoing description of the disclosed embodiments can be realized those skilled in the art or using the present invention.To this
A variety of modifications of a little embodiments will be apparent for a person skilled in the art, and the general principles defined herein can
Without departing from the spirit or scope of the present invention, to realize in other embodiments.Therefore, the present invention will not be limited
It is formed on the embodiments shown herein, and is to fit to consistent with the principles and novel features disclosed in this article widest
Range.
Claims (11)
1. a kind of pipeline transverse crack detection method, which is characterized in that comprising steps of
1) selection probe K value is less than the probe of x, probe K value when x is primary wave and tangent inner wall of the pipe；
2) pipeline is detected using the primary wave of the probe；
If 3) detect the first transversal crack defect, determine that the first transversal crack defect exists.
2. pipeline transverse crack detection method according to claim 1, which is characterized in that
Wherein, R is the exradius of the pipeline；R is the inner circle radius of the pipeline.
3. pipeline transverse crack detection method according to claim 1, which is characterized in that after the step 3), also
Comprising steps of
4) according to the horizontal distance a and vertical distance b of the first transversal crack defect of the probe display, described the is calculated
The transmitting of the depth h of one transversal crack defect, the first transversal crack defect corresponding pipe surface point and the primary wave
Arc length L between point, the position of the first transversal crack defect is determined according to the launch point, L and h of the primary wave.
4. pipeline transverse crack detection method according to claim 3, which is characterized in that
Wherein, R is the exradius of the pipeline.
5. pipeline transverse crack detection method according to claim 3, which is characterized in that after the step 4), also
Comprising steps of
5) launch point of the secondary wave of the probe is determined according to the position of the first transversal crack defect；
6) pipeline is detected using the secondary wave；
If 7) secondary wave detects the second transversal crack defect, and the second transversal crack defect of the probe display
Horizontal distance probe display identical with the horizontal distance for calculating resulting second transversal crack defect, described it is described second horizontal
Vertical distance to crack defect is identical with the vertical distance for calculating resulting second transversal crack defect, then described first laterally
Crack defect exists through primary review.
6. pipeline transverse crack detection method according to claim 5, which is characterized in that in the step 5),
θ '=θ1+θ2,
θ1=180- θ3-θ4,
θ2=180- θ3- α,
Wherein, L ' is the launch point of the secondary wave and first cross in the outer circle of the pipeline
Arc length between the corresponding pipe surface point of crack defect；α is the incidence angle of the secondary wave, and R is the outer circle of the pipeline
Radius；R is the inner circle radius of the pipeline.
7. pipeline transverse crack detection method according to claim 5, which is characterized in that in the step 7),
A '=csin θ ',
B '=R-ccos θ ',
θ '=θ1+θ2,
θ1=180- θ3-θ4；
θ2=180- θ3- α,
Wherein, a ' is the horizontal distance for calculating the resulting second transversal crack defect, and b ' is to calculate resulting second laterally
The vertical distance of crack defect；α is the incidence angle of the secondary wave, and R is the exradius of the pipeline；R is the pipeline
Inner circle radius.
8. pipeline transverse crack detection method according to claim 5, which is characterized in that
In the step 3) and the step 6), the primary wave detects launch point when the first transversal crack defect
Launch point with the secondary wave is in the ipsilateral of the first transversal crack defect.
9. pipeline transverse crack detection method according to claim 8, which is characterized in that after the step 7), also
Comprising steps of
8) launch point of the primary wave of the probe is determined according to the position of the first transversal crack defect；
9) pipeline is detected using the primary wave；
If 10) primary wave detects third transversal crack defect, and the third transversal crack of the probe display lacks
The probe display identical with the horizontal distance for calculating the resulting third transversal crack defect, described of sunken horizontal distance it is described
The vertical distance of third transversal crack defect is identical with the vertical distance for calculating the resulting third transversal crack defect, then institute
The first transversal crack defect is stated to exist through secondary review；
Wherein, primary wave described in the launch point of primary wave described in the step 8) and the step 3) detects described first
Launch point when transversal crack defect is located at the two sides of the first transversal crack defect.
10. pipeline transverse crack detection method according to claim 9, which is characterized in that after the step 9), also
Comprising steps of
11) launch point of the secondary wave of the probe is determined according to the position of the first transversal crack defect；
12) pipeline is detected using the secondary wave；
If 13) secondary wave detects the 4th transversal crack defect, and the 4th transversal crack defect of the display of popping one's head in
The 4th of horizontal distance probe display identical with the horizontal distance for calculating the resulting 4th transversal crack defect, described is laterally
The vertical distance of crack defect is identical with the vertical distance for calculating the resulting 4th transversal crack defect, then described first is horizontal
To crack defect through checking presence three times；
Wherein, the launch point of primary wave described in the launch point of secondary wave described in the step 11) and the step 8) is in institute
State the ipsilateral of the first transversal crack defect.
11. pipeline transverse crack detection method according to claim 8, which is characterized in that after the step 7), also
Comprising steps of
8 ') launch point of the secondary wave of the probe is determined according to the position of the first transversal crack defect；
9 ') pipeline is detected using the secondary wave；
10 ') if the secondary wave detects the 4th transversal crack defect, and the 4th transversal crack defect of the display of popping one's head in
The 4th of horizontal distance probe display identical with the horizontal distance for calculating the resulting 4th transversal crack defect, described is laterally
The vertical distance of crack defect is identical with the vertical distance for calculating the resulting 4th transversal crack defect, then described first is horizontal
Exist to crack defect through secondary review；
Wherein, the step 8 ') described in secondary wave launch point and the step 3) described in primary wave detect first cross
Launch point when to crack defect is located at the two sides of the first transversal crack defect.
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| CN111398424A (en) * | 2020-05-09 | 2020-07-10 | 国电锅炉压力容器检验有限公司 | Pipeline transverse crack positioning method |
| CN115684350A (en) * | 2022-10-31 | 2023-02-03 | 唐山诚储信息技术服务有限公司 | Nondestructive flaw detection method for metal roller |
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Address after: 102209 room 9607, 6th floor, building 309, Guodian new energy technology research, North District, future science and Technology City, Changping District, Beijing Patentee after: Guoneng boiler and Pressure Vessel Inspection Co.,Ltd. Patentee after: Guodian Shiheng Power Generation Co., Ltd Address before: No. 2096, Beijing New Energy Technology Research Institute Patentee before: GUODIAN BOILER AND PRESSURE VESSEL INSPECTION Co.,Ltd. Patentee before: Guodian Shiheng Power Generation Co., Ltd |