WO2008133216A1 - Procédé et dispositif permettant d'évaluer une zone traitée par soudage par points à ultrasons - Google Patents

Procédé et dispositif permettant d'évaluer une zone traitée par soudage par points à ultrasons Download PDF

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Publication number
WO2008133216A1
WO2008133216A1 PCT/JP2008/057643 JP2008057643W WO2008133216A1 WO 2008133216 A1 WO2008133216 A1 WO 2008133216A1 JP 2008057643 W JP2008057643 W JP 2008057643W WO 2008133216 A1 WO2008133216 A1 WO 2008133216A1
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WO
WIPO (PCT)
Prior art keywords
ultrasonic
spot
subject
weld
wave
Prior art date
Application number
PCT/JP2008/057643
Other languages
English (en)
Japanese (ja)
Inventor
Hajime Takada
Hiroshi Adachi
Kousuke Tsuji
Original Assignee
Jfe Steel Corporation
Toyota Shatai Kabushiki Kaisha
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Jfe Steel Corporation, Toyota Shatai Kabushiki Kaisha filed Critical Jfe Steel Corporation
Publication of WO2008133216A1 publication Critical patent/WO2008133216A1/fr

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
    • G01N29/44—Processing the detected response signal, e.g. electronic circuits specially adapted therefor
    • G01N29/4409—Processing the detected response signal, e.g. electronic circuits specially adapted therefor by comparison
    • G01N29/4436—Processing the detected response signal, e.g. electronic circuits specially adapted therefor by comparison with a reference signal
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
    • G01N29/44—Processing the detected response signal, e.g. electronic circuits specially adapted therefor
    • G01N29/46—Processing the detected response signal, e.g. electronic circuits specially adapted therefor by spectral analysis, e.g. Fourier analysis or wavelet analysis
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
    • G01N29/44—Processing the detected response signal, e.g. electronic circuits specially adapted therefor
    • G01N29/50—Processing the detected response signal, e.g. electronic circuits specially adapted therefor using auto-correlation techniques or cross-correlation techniques
    • 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
    • G01N2291/2672—Spot welding

Definitions

  • the present invention relates to a method and an apparatus for inspecting a joining state of a spot welded portion formed by superposing and welding a plurality of plate members by a nondestructive means using ultrasonic waves.
  • a spot welding inspection method that can be carried out simply has been awaited so that spot welds can be inspected with high efficiency on site.
  • a spot welded part hereinafter referred to as a fusion welded part
  • a spot welding inspection method that can easily determine spot welds (hereinafter referred to as “interfacial welds”) that have not been generated.
  • the fusion weld is a good spot weld and the interface weld is a poor spot weld.
  • the body of an automobile is assembled by thousands of spot welds, and the quality of spot welds directly affects the strength and durability of the car body. It is very important to check whether spot welding is properly performed.
  • Patent Documents 1 to 3 an ultrasonic probe is contacted perpendicularly to the plate surface in order to detect interface welding at a spot welded portion that is produced by superimposing and welding two plates.
  • a method and apparatus for detecting a reflected wave by making the light incident is disclosed.
  • the ultrasonic wave (longitudinal wave) perpendicularly incident on the spot welded portion is observed on the bottom multiple reflection echo returning to the ultrasonic probe after multiple reflection between the front and back surfaces of the welded portion.
  • This method makes use of the fact that the echo height of the bottom multiple reflection echo attenuates as it propagates between the fusion weld and the interface weld.
  • the melt-solidified structure of the melt-solidified part (nugget) is also called a dendrite structure, and is a collection of coarse crystals extending in one direction. Therefore, the transmission of ultrasonic waves is poor and the attenuation is large compared to the metal structure of a steel sheet.
  • the metallographic structure of the interfacial welds has a fine crystal grain due to a temperature history close to normalization, so that the transmission of ultrasonic waves is good and the attenuation is small. Therefore, because of the large attenuation at the weld weld, the amplitude of the bottom echo drops sharply as the number of reflections at the bottom increases, whereas at the interface weld weld, the number of reflections at the bottom increases. The drop in the amplitude of the bottom echo accompanying this is gradual. This difference can be used to discriminate between the fusion weld and the interface weld weld.
  • Patent Document 1 Japanese Patent Laid-Open No. 2-8700
  • Patent Document 2 Japanese Patent Laid-Open No. 4 2 6 5 8 5 4
  • Patent Document 3 Japanese Patent Laid-Open No. 2 0 0 0— 1 4 6 9 2 8
  • Patent Document 4 Japanese Patent Application Laid-Open No. 2 0 06-7 1 4 2 2
  • the upper plate 1 0 1 a and the lower plate 1 0 1 b are strongly pressed by an electrode tip (not shown).
  • a depression 1 0 2 b is formed on the surface of the plate 1 0 1 b.
  • the depression 1 2 b is roughly composed of an inclined surface 10 2 c and a flat part, but the flat part also has subtle irregularities. Therefore, the amplitude of the bottom multi-reflected echo that the ultrasonic wave perpendicularly incident on the spot welded part 102 reflects back and forth between the front and back of the welded part and returns to the ultrasonic probe is also affected by the subtle unevenness. Dependent.
  • the inventor of the present application has already proposed the following spot weld evaluation method in Patent Document 4.
  • the ultrasonic evaluation method for spot welds formed by superimposing and welding a plurality of metal plates it propagates in the cross section formed by the direction along the surface of the metal plate or spot weld and the thickness direction.
  • the ultrasonic wave is referred to as an ultrasonic wave propagating along the surface of the subject, it propagates along the surface of the subject from a plurality of transmission positions of the metal plate outside the spot welded portion in a plurality of directions.
  • Ultrasound is transmitted, and at multiple receiving positions on the metal plate outside the spot weld, the ultrasonic wave propagated along the surface of the subject not including the spot weld in the propagation path, and the propagation path spot
  • An ultrasonic wave characterized by receiving ultrasonic waves propagating along the surface of the object including the welded portion and evaluating the soundness of the spot welded portion from the ultrasonic waves received at the plurality of positions.
  • This is a method for evaluating spot welds using According to the present invention, the spot welded portion can be evaluated accurately in a non-destructive manner without being affected by the inclined surface formed around the recess formed in the spot welded portion, and limited to a short time.
  • the spot welded part is highly reliable without being affected by the displacement of the position of the ultrasonic probe and the spot welded part or the contact state between the ultrasonic probe and the metal plate. Succeeded in evaluating the health. Also, in Patent Document 4, the amplitude profile of the ultrasonic wave transmitted using a transducer array and received using another transducer array is obtained, and the width of the amplitude profile below a predetermined threshold is calculated. Disclosed display as nugget diameter.
  • the present invention has been made in order to solve the drawbacks of Patent Document 4, and the problem is that it is not affected by the shape of the spot welded portion and is highly reliable with the fusion welded portion. It is to identify and display the interface weld weld. In other words, the present invention is an improvement over Patent Document 4 that enables instant determination of the quality of spot welds.
  • the present invention relates to an ultrasonic evaluation method of a spot welded portion formed by superposing and welding a plurality of plate materials, and propagating in a cross section formed by a direction along the surface of the plate material or spot welded portion and a thickness direction.
  • the ultrasonic wave that propagates along the surface of the subject is propagated along the surface of the subject in multiple directions from multiple wave transmission positions on the plate material outside the spot weld. Ultrasound is transmitted, and spot welds are not included in the propagation path at the multiple receiving positions of the plate material outside the spot welds. Receiving the ultrasonic wave propagating along the surface of the subject and the ultrasonic wave propagating along the surface of the subject including the spot weld in the propagation path.
  • the present invention also relates to an ultrasonic evaluation apparatus for a spot welded portion formed by superposing and welding a plurality of plate materials, according to the direction along the surface and the thickness direction of the plate material or spot welded portion.
  • the ultrasonic wave propagating in the cross section to be formed is referred to as the ultrasonic wave propagating along the surface of the subject, the subject is directed toward the plural directions from the plurality of transmission positions of the plate material outside the spot welded portion.
  • the ultrasonic wave that propagates along the surface of the subject that does not include spot welding in the propagation path at the multiple receiving positions of the plate material outside the spot welded part , And means for receiving ultrasonic waves propagating along the surface of the subject including spot welds in the propagation path, and a propagation path connecting the plurality of transmission positions and the plurality of reception positions Supersonic waves received in each of And cross-correlation between the signal of the reference ultrasonic signal and the reference ultrasonic signal, and frequency analysis of the ultrasonic signal received in each of the propagation paths connecting the plurality of transmission positions and the plurality of reception positions
  • a means for discriminating a welding state based on at least one of the cross-correlation calculation result and the frequency analysis result, and an ultrasonic spot welded portion characterized by comprising:
  • an ultrasonic signal that has propagated along the surface of the subject that does not include a spot weld in the propagation path can be used.
  • the means for transmitting ultrasonic waves propagating along the surface of the subject from the plurality of transmission positions in a plurality of directions can be an ultrasonic probe including a transducer array.
  • the means for receiving ultrasonic waves at the plurality of receiving positions may be an ultrasonic probe equipped with a transducer array.
  • FIG. 1 is a perspective view showing a basic configuration of an embodiment of the present invention.
  • FIG. 2 is a cross-sectional view showing an ultrasonic propagation path for explaining the principle of the present invention.
  • Figure 3 is also a plan view.
  • Figure 4 is a cross-sectional view of the spot weld.
  • FIG. 5 is a perspective view including a partial block diagram showing an example of an apparatus for carrying out the embodiment of the present invention.
  • FIG. 6 is an explanatory diagram showing a cross-correlation calculation value profile.
  • FIG. 7 is a diagram showing the accuracy of measurement results obtained by the method of the present invention.
  • FIG. 8 is an explanatory diagram showing the magnitude profile of the specific frequency component of the received ultrasonic wave.
  • FIG. 9 is a diagram showing the accuracy of measurement results obtained by the method of the present invention.
  • FIG. 10 is an explanatory diagram showing a determination method using the feature amount space.
  • Figure 11 shows a display example of the identification result between the fusion weld and the interface weld.
  • Fig. 12 is a cross-sectional view illustrating the spot weld.
  • an ultrasonic probe 10 having a transducer array 11 and an ultrasonic probe 20 having a transducer array 21 are connected to an upper plate 1.
  • An appropriate contact medium is interposed between the ultrasonic probe 10 and the ultrasonic probe 20 and the upper plate 1a.
  • the ultrasonic probe 10 Using an ultrasonic probe 10 having the transducer array 11, ultrasonic waves are transmitted from a plurality of positions to the upper plate 1 a.
  • the ultrasonic probe 10 has a structure in which the transducer array 1'1 is attached to the resin wedge 1 2, and the ultrasonic wave transmitted from the transducer array 1 1 is obliquely formed on the upper plate 1 Incident on a.
  • the ultrasonic waves traveling obliquely with respect to the surface of the upper plate la are transmitted into the upper plate la by the obliquely incident ultrasonic waves.
  • the ultrasonic wave traveling diagonally includes longitudinal waves and transverse waves, and propagates through the upper plate: la while repeating reflection and mode conversion on the bottom surface and surface of the upper plate 1a (hereinafter, along the surface of the subject). Also referred to as ultrasonic waves propagating to the surface).
  • the solid line is the transverse wave and the broken line is the longitudinal wave.
  • the propagating ultrasonic waves are received by the ultrasonic probe 20 having the transducer array 21.
  • the ultrasonic probe 20 has a structure in which a transducer array 21 is attached to a resin wedge 22.
  • the plane path shown in Fig. 3 (viewed from the top surface of the metal plate) is obtained by the ultrasonic probe 1 0 equipped with the transducer, ray 1 1 and the ultrasonic probe 2 0 equipped with the transducer array 2 1. (Path) can be received.
  • Ultrasound probe 1 0 transducer array 1 1 represents individual transducers 1 1 i to l 1 N
  • ultrasound probe 2 0 transducer array 2 1 individual transducers 2 1 We denote it as ⁇ 2 1 1 ⁇ .
  • N for example, the number of 4, 8, 16 or 32 can be used.
  • Figure 3 shows the case where N is 16. Since the ultrasonic waves transmitted from the transducers 11 1 to 11 N of the vibrator array have a spatial spread, the plane path shown in Fig. 3 is passed from the transducers 1 li to l 1 N. It can transmit ultrasonic waves.
  • the ultrasonic wave transmitted from the transducer 1 1 i of the ultrasonic probe 10 is received by the transducers 2 1 i to 2 1 N of the ultrasonic probe 2 0.
  • the ultrasonic wave transmitted from the transducer 1 1 2 of the ultrasonic probe 10 is received by the transducers 2 1 i to 2 1 N of the ultrasonic probe 20.
  • This process is repeated until the ultrasonic waves transmitted from the transducer 1 1 N of the ultrasonic probe 10 are received by the transducers 2 1 i to 2 1 N of the ultrasonic probe 2 0.
  • This is done by sequentially changing the oscillator ll n (N l, 2,.
  • ultrasonic waves transmitted from a plurality of positions and propagating in a plurality of directions can be received by the transducer 2 1!-. 2 1 N of the ultrasonic probe 20.
  • the nugget 2 a generated in the spot weld 2 is a molten and solidified structure 2 b having a direction substantially parallel to the plate thickness direction.
  • This molten and solidified structure 2b force is a weld metal as referred to in the present invention.
  • This melt-solidified structure 2b also called a dendrite structure, is a collection of coarse crystals extending in one direction. Compared to other metal structures, the transmission of ultrasonic waves is poor (attenuation is large). Therefore, the ultrasonic wave propagating in the path shown in Fig. 3 is attenuated according to the length of the melt-solidified structure 2b existing in the propagation path when the path contains the melt-solidified structure 2b.
  • the melt-solidified structure 2b has a property that the speed of propagation of the ultrasonic wave is considerably different from that of the metal structure of the metal plate.
  • the specific orientation of the metal crystal shown using the dashed arrows in Fig. 4 is almost aligned in the thickness (z) direction. Therefore, the structure has inertial anisotropy. Therefore, the propagation speed of ultrasonic waves changes depending on the propagation direction (azimuth dependence of propagation speed).
  • the propagation speed of the ultrasonic wave does not depend on the propagation direction and is a constant value.
  • the propagation speed of the ultrasonic wave propagating along the surface of the object is determined when the propagation path includes the molten solidified structure 2 b and when the propagation path does not include the molten solidified structure 2 b (metal Generally, it is different from (propagating only the metal structure of the plate).
  • the ultrasonic wave propagating in the subject while repeating reflection and mode conversion on the bottom and surface of the subject has ultrasonic components propagating in various angular directions, so it melts in the propagation path.
  • the propagation velocity changes for each component due to the azimuth dependence of the propagation velocity, resulting in a significant change in the waveform of the received ultrasonic signal (phase mixing). . .
  • Width of ultrasonic probe 10 used for transmission (total width of transducers 1 li to l 1 N ) and width of ultrasonic probe 20 used for reception (transducers 2 1 i to 2 1
  • the path located at the end of the planar path shown in Fig. 3 (eg 1 1 1 2 1 1 N ⁇ It is possible to prevent the melted and solidified structure 2b from being contained in 1 2 N ).
  • this path that does not include the melt-solidified structure there is only a metal structure of the metal plate (steel plate) and a fine crystal structure that has undergone a temperature history close to normalization.
  • the molten solidified structure 2 contains more high-frequency components.
  • the received ultrasonic wave of the path including the interface weld is compared with the received ultrasonic wave of the path including the molten solidified structure 2b, the received ultrasonic wave of the path including the interface weld is higher in frequency. Contains a lot of ingredients. '
  • the received ultrasonic wave of the path including the melt-solidified structure 2 b also changes its low frequency component as a result of the mixing of the ⁇ : phase. Therefore, comparing the received ultrasonic wave of the path including the melt-solidified structure 2b and the received sound wave of the path not including the molten-solidified structure 2b in the planar path shown in Fig. 3, A difference appears. Similarly, when the received ultrasonic wave of the path including the interface weld and the received ultrasonic wave of the path including the melted solidified structure 2.b are compared, there is a difference in the low frequency component.
  • the cross-correlation calculation is performed with the signal waveform of the received ultrasonic wave on the other path, using the signal waveform of the received ultrasonic wave on the path located at the end as a reference waveform. If the propagation path contains a melt-solidified structure, the cross-correlation calculation value becomes a relatively small value due to a change in the waveform of the received ultrasonic wave.
  • frequency analysis is performed on the ultrasonic signals received in each of the propagation paths connecting a plurality of transmission positions and a plurality of reception positions.
  • solidification structure is included in the propagation path, phenomena such as large attenuation of high frequency components and changes in low frequency components are observed.
  • spotting is performed in ultrasonic transmission and reception. The effect of the dent in the weld does not appear.
  • the ultrasonic wave propagating along the surface of the subject does not lose the property of propagating along the surface even if the incident angle and reflection angle with respect to the subject front and back surfaces are slightly changed due to a few depressions and irregularities. For this reason, in this embodiment, it is possible to identify whether the propagation path includes a force including a melt-solidified structure or whether an interface weld weld is included without being affected by the shape of the spot weld. Can be done.
  • the ultrasonic probe 10 and the ultrasonic probe were applied to the sample on which two metal plates (steel plates) having a thickness of 0.6 mm were overlapped and spot-welded.
  • the ultrasonic probe 10 is driven sequentially from the ultrasonic transmitter / receiver 30 through the switch circuit 25 to the transducer 1 1 to 1 1
  • the ultrasonic wave transmitted from N is received by the ultrasonic probe 2 Q transducers 2 1 i to 2 1 N, and is amplified by the ultrasonic transmitter / receiver 30 through the switch circuit 26.
  • the AZD converter 31 converts the received signal to AZD, and then uses the arithmetic unit 3 2 to transmit the received ultrasonic wave transmitted from the vibrator 1 1 i and received by the vibrator 2 1] as a reference signal.
  • N is 1 6, and the maximum value of the signal waveform after calculation is detected as the cross-correlation calculation result.
  • the frequency analysis (Fast Fourier Transform: FFT) of the received ultrasonic signal received by the transducers 2 1 i to 2 1 N of the ultrasonic probe 20 is performed using the arithmetic device 3 2. It was.
  • Figure 6 compares the cross-correlation calculation profile measured using a spot weld sample containing a melt-solidified structure and an interfacial weld sample.
  • the result of cross-correlation with the reference signal is displayed in the order of the path number n.
  • FIG. 6 there is a clear difference in the cross-correlation calculation value profile between the spot weld sample containing the melt-solidified structure and the interfacial weld sample.
  • Figure 7 shows the average value of the specific frequency components of the received ultrasonic waves measured using the spot weld sample including the melt-solidified structure and the interface weld weld sample (for example, in this experiment, the ultrasonic probe 1 0
  • the center frequency of ultrasonic waves transmitted and received by 20 and 20 is in the range of 10%, and if the center frequency is 10 MHz, the range is 9 to 11 MHz, spot welds including melt-solidified structures and interface weld spots. Any frequency component that can be observed to be different from the welded part is shown in comparison with the magnitude profile of the received ultrasonic wave.
  • Is the magnitude of the specific-frequency component of the received ultrasonic signal transmitted from the vibrator 1 1 ⁇ and received by the vibrator 2 1 ⁇ ( ⁇ 1, 2, 3,..., 1 6).
  • the path numbers are arranged in the order of ⁇ , as shown in Fig. 7.
  • the wedge members 1 2 and 22 of the ultrasonic probes 10 and 20 are made of polystyrene, and the transducer arrays 1 1 1 16 and 2 1 to 2 1 16 are arranged in an array.
  • the spot weld 2 was measured so that the width of the vibrator in the direction was 0.8 mm and the incident angle of the ultrasonic wave on the top plate surface was 25.4 °.
  • 30 samples prepared by spot welding two steel sheets with a thickness of 0.6 mm were used.
  • 20 are spot weld sample containing melt-solidified structure
  • 10 are interface weld spot weld sample.
  • FIG. 8 shows the correlation calculation evaluation index for each sample. Spot welded sun containing molten solidified structure It can be seen that there is a clear difference in the correlation calculation evaluation index between the pull and the interface weld spot weld sample. By setting an appropriate threshold value for the correlation calculation evaluation index, it is possible to determine a spot weld including a melt-solidified structure and an interface weld spot weld.
  • the frequency of the specific frequency component of the received ultrasonic wave was determined by fast Fourier transform (FFT).
  • FFT fast Fourier transform
  • the average value of the specific frequency components of multiple paths was calculated and used as a frequency evaluation index.
  • vibrator 1 l n ⁇ vibrator 2 1 n , n 6, 7,-, 11, and there is a difference between spot welds containing molten solidified structures and interface weld spot welds Any route can be selected as long as it is observed, and any number can be selected.
  • Figure 9 shows the frequency evaluation index for each sample. It can be seen that there is a clear difference in the frequency evaluation index between the spot weld sample containing the molten and solidified structure and the interface weld spot weld sample.
  • the frequency evaluation index By setting an appropriate threshold value for the frequency evaluation index, it is possible to determine a spot weld including a melt-solidified structure and an interfacial weld spot weld.
  • a frequency evaluation index in addition to the average value of the specific frequency component in the predetermined route, the maximum value of the specific frequency component in the predetermined route, the center of gravity frequency, the center frequency, and the change in the low-frequency ultrasonic component Indices such as condition can be used.
  • the frequency evaluation index may be configured using two or more indices.
  • the determination may be made using either the correlation calculation evaluation index or the frequency evaluation index. Note that, when both evaluation indexes are combined, the reliability of the determination result is improved.
  • two or more evaluation indexes are selected from the correlation calculation evaluation index and the frequency evaluation index to be feature quantity A, feature quantity B, and so on.
  • the center of gravity of the spot welded part group (healthy group) and interfacial weld spot welded part group (defective group) is obtained in advance, and when measuring a new spot welded part, the feature value space of the spot welded part measured value Position (measurement value position) and sound collection
  • the distance between the group (healthy distance) and the distance between the measured value position and the defective group (defect distance) are obtained and compared, and it is determined that the spot weld is included in the smaller group. Moyore.
  • Figure 11 shows a display example of the identification result between the fusion weld and the interface weld.
  • the case of a fusion weld is shown in (a) in Fig. 11.
  • the case of an interfacial weld is shown in (b) in Fig. 11.
  • the ultrasonic probe provided with the transducer array is used on both the transmission side and the reception side, the configuration is simple. It is also possible to use a plurality of probes in juxtaposition to either one or both, or to scan and use a single probe. .
  • the present invention is applied to welding inspection of a metal plate (steel plate), but the application target of the present invention is not limited to this. It can also be applied to welding inspection of aluminum plates and other inorganic and organic materials. Also, the number of welds is not limited to two, and the evaluation of the soundness of spot welds is not limited only to the identification of spot welds containing a melt-solidified structure and spot welds containing an interface weld. Les.

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Abstract

L'invention a trait à un procédé permettant de distinguer de manière fiable une zone traitée par soudage par points à ultrasons d'une zone traitée par soudage par dépôt à l'interface sans être influencé de manière défavorable par la forme de la zone traitée par soudage par points. Des ondes ultrasonores se propageant le long de la surface d'un sujet sont envoyées dans une pluralité de directions à partir de positions émettrices d'onde sur des plaques extérieures (1a, 1b) d'une zone traitée par soudage par points (2). Les ondes ultrasonores se propageant le long de la surface du sujet dont le chemin de propagation n'inclut pas la zone traitée par soudage par points (2) et les ondes ultrasonores se propageant le long de la surface du sujet dont le chemin de propagation inclut la zone traitée par soudage par points (2) sont reçues sur les positions réceptrices d'onde sur la plaque extérieure de la zone traitée par soudage par points (2). La corrélation croisée entre le signal de l'onde ultrasonore reçue se propageant par chacun des chemins de propagation reliant les positions émettrices d'onde et les positions réceptrices d'onde et le signal d'une onde ultrasonore référence est calculée, et/ou la fréquence du signal de l'onde ultrasonore reçue se propageant par chacun des chemins de propagation est analysée. L'état soudé est jugé à partir du résultat du calcul de la corrélation croisée et/ou du résultat de l'analyse de fréquence.
PCT/JP2008/057643 2007-04-19 2008-04-14 Procédé et dispositif permettant d'évaluer une zone traitée par soudage par points à ultrasons WO2008133216A1 (fr)

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JP2012093307A (ja) * 2010-10-28 2012-05-17 Jfe Steel Corp スポット溶接部の検査方法及び検査装置

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JP2006226716A (ja) * 2005-02-15 2006-08-31 Jfe R & D Corp 構造物の損傷検出方法及びシステム

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CN111948285B (zh) * 2019-05-14 2023-10-20 株式会社东芝 推定装置、检查系统、推定方法及存储介质

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