CN107449829A - A kind of butt weld Non-Destructive Testing acceptance method - Google Patents
A kind of butt weld Non-Destructive Testing acceptance method Download PDFInfo
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- CN107449829A CN107449829A CN201710676584.8A CN201710676584A CN107449829A CN 107449829 A CN107449829 A CN 107449829A CN 201710676584 A CN201710676584 A CN 201710676584A CN 107449829 A CN107449829 A CN 107449829A
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- paut
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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
- G01N29/06—Visualisation of the interior, e.g. acoustic microscopy
- G01N29/0654—Imaging
- G01N29/069—Defect imaging, localisation and sizing using, e.g. time of flight diffraction [TOFD], synthetic aperture focusing technique [SAFT], Amplituden-Laufzeit-Ortskurven [ALOK] technique
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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
- G01N2291/26—Scanned objects
- G01N2291/267—Welds
- G01N2291/2675—Seam, butt welding
Abstract
The invention provides a kind of butt weld Non-Destructive Testing acceptance method, comprise the following steps：PAUT and TOFD scannings are carried out to weld seam, gather image, the image of collection in worksite is subjected to comprehensive analysis to confirm the position of reflector；Judge to identify TOFD to the reflected signal that PAUT has found for irrelevant display or related display；If related display, further differentiate that defect type is area-type or non-area-type；When judge defect for area-type defect when, the elevation carrection of defect is carried out on TOFD images, and linear measure longimetry is carried out on PAUT images；When it is non-area-type defect to judge defect, the wave amplitude and length of defect are being measured obtained by PAUT scannings on image.Situations such as weld defects such as the welding of the invention for cut deal weld seam is more difficult, easily cracks, to solving the problems, such as that related display identification is difficult in the independent detection process of TOFD or PAUT, positioning is inaccurate, when PAUT and TOFD detection acceptance methods are used in combination, reduce the erroneous judgement of testing result and fail to judge, be preferably minimized loss.
Description
Technical field
The present invention relates to detection technique field, and in particular to a kind of butt weld Non-Destructive Testing acceptance method.
Background technology
At present, it is thick in the industries such as ship, nuclear power, oil, pressure vessel all be unable to do without（Thickness is 40~100mm）Steel plate
Use, medium plate is more difficult in welding, easily cracks, the defects of incomplete fusion, stomata, slag inclusion.In order to detect
Go out these defects, it is necessary to carry out Non-Destructive Testing.The detection to cut deal weld seam was mainly X-ray detection and ultrasound examination in the past
For main method.Recently, due to the development of new technology, PAUT（Phased Array Ultrasonic Testing phased arrays surpass
Sound detection）And TOFD（Time of Flight Diffraction time differences diffracting ultrasonic detects）New technical use detects ship
Cut deal weld seam, and good effect is achieved, but due to the respective detection feature of PAUT and TOFD detection techniques, examining
Problems be present when surveying cut deal weld seam：
（1）PAUT mainly utilizes principle of reflection, can be to precise defect location, but to area-type（Such as crackle, incomplete fusion, not
Through welding etc.）The type identification of Dangerous defect is difficult,；
（2）TOFD detections mainly utilize endpoint diffraction method, and to incomplete fusion, crackle homalographic type defect is especially sensitive, can be effectively
Such defect is detected, and according to characteristics of image, judges defect type, but TOFD detections are led to the position inaccurate of defect
Defect can not remove when cause is reprocessed, and TOFD detections upper and lower surface has blind area；
（3）Individually checked and accepted using PAUT or TOFD is checked and accepted, defect missing inspection, Flaw discrimination can be caused difficult, check and acceptance result is unreliable.
The content of the invention
To solve the above problems, the invention provides a kind of butt weld Non-Destructive Testing acceptance method, comprise the following steps：
S1：PAUT and TOFD scannings are carried out to weld seam, gather image, it is anti-to confirm that the image of collection in worksite is carried out into comprehensive analysis
The position of beam；
S2：Judge to identify TOFD to the reflected signal that PAUT has found for irrelevant display or related display；
S3：If related display, further differentiate that defect type is area-type or non-area-type；
S4：When judge defect for area-type defect when, the elevation carrection of defect is carried out on TOFD images, and linear measure longimetry is in PAUT
Carried out on image；When it is non-area-type defect to judge defect, the wave amplitude and length of defect are being measured obtained by PAUT scannings on image
Degree.
Specifically, the step S1 further comprises：
S11：Surface treatment to be detected is clean, and detection zone includes weld seam both sides and heat affected area；
S12：Sprinkled water in weld seam side spray, detection surface is fully soaked, ensure that probe couples well with workpiece surface；
S13：PAUT probes are fixed on probe holder or directly popped one's head in a PAUT, number is gathered with certain speed scanning
According to；
S14：A pair of TOFD probes are fixed on probe holder, the distance between probe is regulated, is adopted with certain speed scanning
Collect data；
Specifically, the step S2 further comprises：
S21：PAUT has found reflected signal, makees following judgement：
It is by structure that if the reflected signal of PAUT scannings, which determines,（Profile）Caused, do not keep a record；
It is not as caused by structure, into S3 that if the reflected signal of PAUT scannings, which determines,.
The step S2 is still further comprised：
S22：If TOFD has found reflected signal, but PAUT does not have found transmission signal, then needs to adjust PAUT parameter
It is whole, change line and sweep angle or change fan sweeping angle, use PAUT scannings again afterwards：Observe the reflection letter that PAUT has found relevant position
Number, into S3；PAUT does not have found that coherent signal is shown after such as adjusting, then re-starts TOFD scanning confirmation signals and be shown as non-phase
Close display.
Further, when it is determined that the reflected signal of TOFD to PAUT scannings is related display, then TOFD data can be made
For the basic data of PAUT data, and analyze TOFD images；If there is obvious end points diffracted wave up and down on TOFD images, sentence
It is area-type defect to determine defect；If not having upper and lower end points diffracted wave on TOFD images, judgement defect is non-area-type defect.
Preferably, fan sweeping angle is 40 °~70 °.
Compared with existing individually acceptance method, a kind of butt weld Non-Destructive Testing acceptance method of the invention has following effect
Fruit：The present invention for cut deal weld seam welding it is more difficult, easily crack, the weld defect such as incomplete fusion situations such as, it is right
In solving the problems, such as that related show identifies that difficult, positioning is inaccurate in the independent detection process of TOFD or PAUT, PAUT and TOFD are detected
When acceptance method is used in combination, PAUT and TOFD technologies each advantage can be played, the erroneous judgement of testing result is reduced and fails to judge, make to have
The loss of the area-type defect of harmfulness is preferably minimized.
Brief description of the drawings
Fig. 1：The ultrasound beamformer shown in PAUT detections by sound path；
Fig. 2：The ultrasonic wave wire harness shown in PAUT detections by actual geometric configuration；
Fig. 3：TOFD detection principle diagrams；
Fig. 4：PAUT and TOFD joint detection process schematic diagrames；
Fig. 5：Probe arrangement figure during PAUT and TOFD joint-detection weld seams；
Fig. 6：PAUT detected reflectance signal schematic diagrames；
Fig. 7：The first PAUT detects defect schematic diagram；
Fig. 8：The first TOFD detects defect schematic diagram；
Fig. 9：Second of PAUT detects defect schematic diagram；
Figure 10：Second of TOFD detects defect schematic diagram；
Figure 11：PAUT defect length instrumentation plans.
Embodiment
Design, concrete structure and the caused technique effect of the present invention are described further below with reference to accompanying drawing, with
It is fully understood from the purpose of the present invention, feature and effect.
PAUT detection ultrasonic phased array technologies are a kind of numerals to be grown up using phase delay and bore diameter synthesizing technology
Ultrasonic detecting technology, it can generate the ultrasound beamformer of being differently directed property, produce not by controlling the delay of each independent array element
With the acoustic beam effect of form, as shown in figure 1, being the ultrasound beamformer shown by sound path；Fig. 2 is what is shown by actual geometric configuration
Ultrasonic wave wire harness.
Ultrasound beamformer can simulate the work of various tiltedly focusing probes, and can be with electron scanning and dynamic focusing, nothing
Need or few mobile probe, detection speed is fast, and probe is placed on the complete image of a position can generation object to be detected, realizes
Automatic scanning, and the object of detectable complicated shape, overcome some limitations of conventional A-mode ultrasonic impulse method.
PAUT advantage：
1. usual optimal control focal spot size, burnt area's depth and sound beam direction, can make detection resolving power, signal to noise ratio and sensitivity
It is improved etc. performance, it is accurate to defect location.
2. simulation imaging technology, solve complicated build of geometry and detect problem, live generation geometry image in real time, gently
Pine points out deficiencies real features position, is imaged by each acoustic beam A total numbers according to generation, actually detected combined process trajectory track, can use
In the weld seam detection of form of ownership, simultaneous display A, B, S, C, D, P, 3D scan data.
3. ultrasonic beam direction can freely convert, focus can adjust or even realize dynamic focusing, and probe is fixed just
It can realize that ultrasonic wave fan sweeping or line are swept, phased-array technique can carry out electron scanning, a quantity faster than common raster scanning
Grade.
4. having good acoustic beam accessibility, scanning can be carried out to the workpiece of complex set shape.
PAUT limitation：
1. as detecting conventional Ultrasound, PAUT can not accurately judge the type of defect, especially area-type defect；
2. higher is required to detection surface condition；
3. cost is higher than similar Multi probe system, particularly end systems；
4. it is with high content of technology, it is not easy to be accepted, there is resistance in popularization；
5. debugging is difficult, but once sets, just easily it can change and adjust.
Fig. 3 is TOFD detection principle diagrams：TOFD detections can sweep display mode with A simultaneously and D sweeps display mode to represent,
It is to be detected a flaw using a pair of frequencies, size, angle identical longitudinal wave probe；One is used as transmitting probe, and another is used as and connect
Receive probe, two relative probe positions in weld seam both sides and center probe on the same line, PCS in figure（Probe Center
Separation）Center probe spacing is represented, T represents thickness of workpiece, t0Represent the time.Transmitting probe launches horizontal compressional wave,
Zero defect position receiving transducer is firstly received straight-through ripple LW（Lateral Wave）, this ripple is between two probes with compressional wave
Speed is propagated, and then receives reflection echo BW（Back Wall）.If crack defect within the workpiece be present, lacking
Sunken both ends in the end points up and down of defect, will also produce diffracted wave respectively, its diffraction energy derives from addition to common back wave
Defect end.This two beams diffracted wave number occurs straight-through between ripple and bottorm echo.The signal of defect two-end-point is in time
To be distinguishable, the time difference propagated according to diffracted wave signal can determine that the value of flaw height.
The advantages of TOFD：
1. high to area-type defect detection rate, the technology will not be because the directionality of welding line structure or defect be with regard to the last inspection in left and right
Result is surveyed, its testing result has very high stability.
2. utilizing diffraction time difference computational methods, the height of area-type defect can be calculated accurately.
3. detection efficiency is high, the technology only needs to do linear scanning can to weld seam completion scanning, largely expands
Big single group probe detection is big to the coverage of weld seam, considerably beyond traditional detection method.
4. diffracted wave has high sensitivity, so defect missing inspection is few, complete detection data are recorded by image, it is reproducible.
TOFD limitation：
1. TOFD detection defect locations are difficult, non-parallel Scanning speed is fast, but not can determine which side of the defect in weld seam.
2. the benign defect that too high sensitivity is exaggerated in weld seam sometimes is lacked, quantitatively some are bigger than normal, such as stomata, cold interlayer
Deng.
3. check frequency be present, i.e. the near surface in workpiece（Including surface and bottom surface）.
Based on the respective advantage and disadvantage of the above PAUT and TOFD detection, so PAUT and TOFD detection acceptance methods are used in combination
When, effect can be more preferable, has the function that to make up mutually, learns from other's strong points to offset one's weaknesses.
As shown in figure 4, the preferred embodiment of the present invention provides a kind of butt weld Non-Destructive Testing acceptance method, wrap
Include following steps：
S1：PAUT and TOFD scannings are carried out to weld seam, gather image, it is anti-to confirm that the image of collection in worksite is carried out into comprehensive analysis
The position of beam；
S2：Judge to identify TOFD to the reflected signal that PAUT has found for irrelevant display or related display；
S3：If related display, further differentiate that defect type is area-type or non-area-type；
S4：When judge defect for area-type defect when, the elevation carrection of defect is carried out on TOFD images, and linear measure longimetry is in PAUT
Carried out on image；When it is non-area-type defect to judge defect, the wave amplitude and length of defect are being measured obtained by PAUT scannings on image
Degree.
Specifically, the step S1 further comprises：
S11：Surface treatment to be detected is clean, and detection zone includes weld seam both sides and heat affected area；
S12：Sprinkled water in weld seam side spray, detection surface is fully soaked, ensure that probe couples well with workpiece surface；
S13：A pair of PAUT probes are fixed on probe holder or directly popped one's head in a PAUT, are gathered with certain speed scanning
Data；
S14：A pair of TOFD probes are fixed on probe holder, the distance between probe is regulated, is adopted with certain speed scanning
Collect data；
Specifically, the step S2 further comprises：
S21：PAUT has found reflected signal, makees following judgement：
It is by structure that if the reflected signal of PAUT scannings, which determines,（Profile）Caused, do not keep a record；
It is not as caused by structure, into S3 that if the reflected signal of PAUT scannings, which determines,.
The step S2 is still further comprised：
S22：If TOFD has found reflected signal, but PAUT does not have found transmission signal, then needs to adjust PAUT parameter
It is whole, change line and sweep angle or change fan sweeping angle, use PAUT scannings again afterwards：Observe the reflection letter that PAUT has found relevant position
Number, into S3；PAUT does not have found that coherent signal is shown after such as adjusting, then re-starts TOFD scanning confirmation signals and be shown as non-phase
Close display.
Further, when it is determined that the reflected signal of TOFD to PAUT scannings is related display, then TOFD data can be made
For the basic data of PAUT data, and analyze TOFD images；If there is obvious end points diffracted wave up and down on TOFD images, sentence
It is area-type defect to determine defect；If not having upper and lower end points diffracted wave on TOFD images, judgement defect is non-area-type defect.
Specifically, whether can checking and accepting for weld seam determined with following four-stage：
First stage differentiates whether reflector is related display（Reflected signal is shown as caused by defect）
PAUT and TOFD scannings are carried out to weld seam, confirm the position of reflector.
Because the reflector of reflected signal can be precisely located by PAUT, if so reflection letter of PAUT scannings
Number determination is by structure（Profile）Caused, do not keep a record；It is not by structure institute that if the reflected signal of PAUT scannings, which determines,
It is caused, into second stage.
Because TOFD is very sensitive to the end points diffraction of reflector, if so finding reflected signal, but PAUT by TOFD
Transmission signal is not found, then needs to be adjusted PAUT parameter, changes line and sweeps angle, change fan sweeping angle, Zhi Houzai
Secondary to use PAUT scannings, observation PAUT has found the reflected signal of relevant position, and such as discovery is related to show signal, into second stage.
Do not find that coherent signal show after such as adjusting, then need to re-start TOFD collection of illustrative plates scanning confirmation signals and be shown as irrelevant and show
Show.
Second stage differentiates that defect type is area-type or non-area-type
If it is determined that the reflected signal of TOFD and PAUT scannings is caused by defect, then can be using TOFD data as PAUT data
Basic data, and analyze TOFD images.
Judge TOFD detections defect whether there is obvious end points diffracted wave, and have with certain height.If TOFD images
On have obvious end points diffracted wave up and down, then directly as area-type defect processing, into the phase III；If on TOFD images
There is no upper and lower end points diffracted wave, then directly as non-area-type defect processing, into the phase III.
The measurement of phase III defect
When judgement defect is area-type defect（Crackle, incomplete fusion etc.）When, establishing criteria and technology contract require, if necessary to right
Defect, which carries out elevation carrection and linear measure longimetry, the elevation carrection of defect, to be carried out on TOFD images, and length is on PAUT images
Carry out.
When judgement defect is non-area-type defect（Stomata, slag inclusion etc.）When, measuring defect on image obtained by PAUT scannings
Wave amplitude and length.
The examination of fourth stage defect
To area-type defect establishing criteria and technology contract requirement, judge whether to check and accept with reference to the PAUT and TODF data measured,
If regulation is not allow for area-type defect, direct Repair（Reject）.
During to non-area-type defect, establishing criteria and technology contract requirement, judge whether to check and accept with reference to PAUT measurement data.
In the present embodiment, thickness of workpiece scope 40mm~100mm for being detected, groove type is V-type, X-type etc., welding
Mode is the fusion welding Type of Welding such as Lincoln weld.
PAUT is detected
1. equipment：OLYMPUS OMNISCAN MX2
2. pop one's head in：The chips of 5MHz 64
3. main arrange parameter：40 °~70 ° of fan sweeping angle
TOFD is detected
1. equipment：OLYMPUS OMNISCAN MX2
2. pop one's head in：3.5MHz
3. main arrange parameter：PCS=155.8mm
The PAUT and TOFD detection process integration design phases, PAUT detections are general will at least to be met to detect required for acoustic beam all standing
Region, enter line if necessary and sweep and fan sweeping multiple combinations scanning；TOFD detections meet the needs of full weld seam detection, if necessary
TOFD technological designs should carry out Subarea detecting.Fan sweeping angle is 40 °~70 °.
Detection process is as follows：
1. during Site Detection, first that surface treatment to be detected is clean, detection zone includes weld seam both sides and heat affected area；
2. being sprinkled water in weld seam side spray, detection surface is fully soaked, ensure that probe couples well with workpiece surface；
3. according to characterization processes, popped one's head in a PAUT, such as schemed then with certain speed scanning gathered data in weld seam two respectively
Shown in 5, wherein A represents PAUT probes；
4. according to characterization processes, a pair of TOFD probes are fixed on probe holder, the distance between probe are regulated, with certain
Speed scanning gathered data, as shown in figure 5, wherein B represents TOFD probes；
5. the image of collection in worksite is carried out into comprehensive analysis, concrete analysis is as follows：
First, TOFD detection images are observed, it is determined that it is main the defects of situation be present, for TOFD image conditions, with reference to PAUT
Associated picture is detected, judges reflected signal in the position of welding line structure, identifies that the reflected signal that TOFD and PAUT has found is non-phase
Close or correlation is shown, referring to Fig. 6, judged by signal analysis, this reflected signal is irrelevant display（It is anti-by weld reinforcement
Penetrate）, it is not related display（Related display caused by defect）, so without record.
Further, during Site Detection, TOFD has found correlated reflection signal when detecting, it is likely that PAUT is in corresponding position
Not reflected signal is put, now testing staff sweeps angle, fan sweeping angle by changing PAUT arrange parameter by adjusting modified line
The parameters such as degree, reflected signal is found on PUAT image, further, judges this reflection by signal analysis on relevant position
Signal is irrelevant or related display.
Further, reflected signal is found with the scanning of PAUT and TOFD joints, as shown in Figure 7 and Figure 8, passes through PAUT images
Reflected signal is analyzed and judged, this reflected signal is as caused by defect reflection.Further, by analyzing TOFD images,
Relevant position also have reflected signal as shown in figure 8, and defect have obvious end points diffracted signal up and down, thus can determine that this defect
For area-type defect.Further, reflected signal is found with the scanning of PAUT and TOFD joints, as shown in Figure 9 and Figure 10, passed through
The analysis of PAUT picture signals judges that this reflection number is by defect reflection.By analyzing TOFD, also there is reflection to believe in relevant position
Number, as shown in Figure 10, this defect reflection signal does not have upper and lower end points diffracted wave, thus can determine that this defect lacks for non-area-type
Fall into.
Area-type defect in Fig. 8 is carried out to survey the high height that can obtain this defect.
Survey length is carried out to the defects of Fig. 9, the length of this defect can be obtained.As shown in figure 11.
Finally, with reference to associated acceptance solid standard, this weld seam is carried out an acceptance inspection.
Compared with existing individually acceptance method, a kind of butt weld Non-Destructive Testing acceptance method of the invention has following effect
Fruit：
The present invention for cut deal weld seam welding it is more difficult, easily crack, the weld defect such as incomplete fusion situations such as, it is right
In solving the problems, such as that related show identifies that difficult, positioning is inaccurate in the independent detection process of TOFD or PAUT, PAUT and TOFD are detected
When acceptance method is used in combination, PAUT and TOFD technologies each advantage can be played, the erroneous judgement of testing result is reduced and fails to judge, make to have
The loss of the area-type defect of harmfulness is preferably minimized.
According to the teaching of the present embodiment, those skilled in the art can be achieved in other scope of the present invention completely
Technical scheme.
Above content is to combine specific preferred embodiment further description made for the present invention, it is impossible to is assert
The specific implementation of the present invention is confined to these explanations.For general technical staff of the technical field of the invention,
On the premise of not departing from present inventive concept, some simple deduction or replace can also be made, should all be considered as belonging to the present invention's
Protection domain.
Claims (6)
1. a kind of butt weld Non-Destructive Testing acceptance method, it is characterised in that comprise the following steps：
S1：PAUT and TOFD scannings are carried out to weld seam, gather image, it is anti-to confirm that the image of collection in worksite is carried out into comprehensive analysis
The position of beam；
S2：Judge to identify TOFD to the reflected signal that PAUT has found for irrelevant display or related display；
S3：If related display, further differentiate that defect type is area-type or non-area-type；
S4：When judge defect for area-type defect when, the elevation carrection of defect is carried out on TOFD images, and linear measure longimetry is in PAUT
Carried out on image；When it is non-area-type defect to judge defect, the wave amplitude and length of defect are being measured obtained by PAUT scannings on image
Degree.
2. the method as shown in claim 1, it is characterised in that the step S1 further comprises：
S11：Surface treatment to be detected is clean, and detection zone includes weld seam both sides and heat affected area；
S12：Sprinkled water in weld seam side spray, detection surface is fully soaked, ensure that probe couples well with workpiece surface；
S13：A pair of PAUT probes are fixed on probe holder according to characterization processes requirement or directly popped one's head in a PAUT, with one
Fixed speed scanning gathered data；
S14：A pair of TOFD probes are fixed on probe holder according to technological requirement, the distance between probe are regulated, with certain
Speed scanning gathered data.
3. the method as shown in claim 1, it is characterised in that the step S2 further comprises：
S21：PAUT has found reflected signal, makees following judgement：
It is by structure that if the reflected signal of PAUT scannings, which determines,（Profile）Caused, do not keep a record；
It is not as caused by structure, into S3 that if the reflected signal of PAUT scannings, which determines,.
4. the method as shown in claim 1, it is characterised in that the step S2 is still further comprised：
S22：If TOFD has found reflected signal, but PAUT does not have found transmission signal, then needs to adjust PAUT parameter
It is whole, change line and sweep angle or change fan sweeping angle, use PAUT scannings again afterwards：Observe the reflection letter that PAUT has found relevant position
Number, into S3；PAUT does not have found that coherent signal is shown after such as adjusting, then re-starts TOFD scanning confirmation signals and be shown as non-phase
Close display.
5. the method as shown in claim 1, it is characterised in that when it is determined that the reflected signal of TOFD to PAUT scannings is related aobvious
When showing, then basic data that can be using TOFD data as PAUT data, and analyze TOFD images；If have on TOFD images obvious
End points diffracted wave up and down, then judge defect be area-type defect；If there is no upper and lower end points diffracted wave on TOFD images, sentence
It is non-area-type defect to determine defect.
6. method as stated in claim 5, it is characterised in that the fan sweeping angle is 40 °~70 °.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108508093A (en) * | 2018-03-26 | 2018-09-07 | 中国计量大学 | A kind of detection method and system of workpiece, defect height |
| CN109374745A (en) * | 2018-12-03 | 2019-02-22 | 上海市建筑科学研究院 | Horizontal joint construction quality rapid detection method |
| WO2020191972A1 (en) * | 2019-03-28 | 2020-10-01 | 深圳中凯剑无损检测设备科技有限公司 | Nature determination system and nature determination method for ultrasonically detected defect |
| CN113916977A (en) * | 2021-08-20 | 2022-01-11 | 西安热工研究院有限公司 | Calculation method for covering bottom surface blind area through TOFD single probe in offset manner |
| CN114199998A (en) * | 2020-09-18 | 2022-03-18 | 宝山钢铁股份有限公司 | Manual detection method and device for non-fusion and slag inclusion defects of welded pipe groove |
| CN114235963A (en) * | 2021-12-21 | 2022-03-25 | 一重集团大连核电石化有限公司 | Method for detecting cracks under surfacing layer |
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| CN114199998A (en) * | 2020-09-18 | 2022-03-18 | 宝山钢铁股份有限公司 | Manual detection method and device for non-fusion and slag inclusion defects of welded pipe groove |
| CN114199998B (en) * | 2020-09-18 | 2024-03-08 | 宝山钢铁股份有限公司 | Manual detection method and device for welding pipe groove unfused and slag inclusion defects |
| CN113916977A (en) * | 2021-08-20 | 2022-01-11 | 西安热工研究院有限公司 | Calculation method for covering bottom surface blind area through TOFD single probe in offset manner |
| CN114235963A (en) * | 2021-12-21 | 2022-03-25 | 一重集团大连核电石化有限公司 | Method for detecting cracks under surfacing layer |
| CN114235963B (en) * | 2021-12-21 | 2024-04-16 | 一重集团大连核电石化有限公司 | Method for detecting cracks under build-up welding layer |
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