JP2002131297A - Ultrasonic inspection device and method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide ultrasonic inspection device and method, that have improved ultrasonic flaw detection in terms of mass production and measure the dimensions of a scratch, shape discontinuity section, material discontinuity section, and the like with respect to a body to be inspected that has large dimensions and has a recess at a target site. SOLUTION: In the ultrasonic inspection device and method, having an ultrasonic probe for detecting the shape of the body to be inspected which has deeper recess and projection that surface roughness by transmitting and receiving ultrasonic waves from the side having the recess and projection, a delay material having a thickness that is larger than the recess and projection is provided between the recess and projection side of the body to be inspected and the ultrasonic probe, which is suitable for inspecting the welding dimensions of a spot welding section, back penetration of a butt welding section, or the like.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for transmitting an ultrasonic wave into a material to be inspected, and using an ultrasonic signal reflected from the inside or the back of the material to receive a non-uniform portion or a non-uniform shape of the material. The present invention relates to an ultrasonic inspection apparatus and an inspection method for measuring dimensions in a range including a continuous portion or a non-uniform portion and a shape discontinuity at the same time.

[0002] In particular, the present invention relates to the field of ultrasonic flaw detection test / inspection such as inspection of spot welds, inspection of backlash of structural welds, and inspection of weld flaws.

[0003]

2. Description of the Related Art In an ultrasonic flaw detection test, an ultrasonic wave is applied to an object to be inspected from an ultrasonic probe, and an ultrasonic signal reflected from a flaw or the like is observed on a screen of the ultrasonic flaw detector to perform inspection. It is common to do. At this time, the scanning of the ultrasonic probe may be performed by any of the direct contact method, the gap method, the local immersion method, and the total immersion method as described in page 53 of the ultrasonic inspection test edited by the Japan Non-Destructive Inspection Association. It depends on the method. In the case of the direct contact method, the gap method, and the local immersion method in which the inspector holds the ultrasonic probe and scans the inspected object, if the inspected object has irregularities, the ultrasonic probe follows the surface Scanning may be difficult. On the other hand, in the case of the total immersion immersion method, there is an advantage that flaw detection can be performed without largely depending on the surface unevenness.

[0004] For this reason, in the case where the surface has irregularities such as spot welds, a water immersion method as disclosed in JP-A-6-265529 has been proposed. The water immersion method is a method in which an object to be inspected is submerged in a water tank, and an ultrasonic probe is scanned in the water tank.If the inspected object is large or mass-produced, the inspection efficiency may decrease. is there. Further, when the shape of the inspection object is a curved surface, there is a problem that a mechanism for scanning the ultrasonic probe along the curved surface becomes complicated.

Therefore, the test object is large and mass-produced.
If the target area includes a curved surface, the direct contact method
Although it is better to use the gap method or the local water immersion method, there is a problem that the ultrasonic probe cannot stably contact due to surface irregularities.

[0006] On the other hand, in the ultrasonic flaw detection test,
As described in page 59 of the ultrasonic inspection test edited by the Japan Non-Destructive Inspection Association as a method of measuring the dimensions of the shape discontinuous portion and the material discontinuous portion, scanning of the ultrasonic probe moving distance and the reflected wave height value There is a method in which a graph is created and a moving distance of the ultrasonic probe in a range exceeding a predetermined peak value level is set as a size of a flaw or a discontinuous portion.

[0007] One example is JP-A-6-265529. This is a method of measuring spot weld dimensions,
And a method of determining the dimensions to obtain a reflection intensity distribution of a bottom surface reflected wave B ₁ echoes of the reflected wave I ₁ echo and junction from the junction surface of the upper plate by scanning the ultrasonic beam lower plate is shown.

FIG. 8 shows a specific example of a conventional method. The ultrasonic beam 8 transmitted from the ultrasonic probe 1 is reflected as an S echo, an I echo, and a B echo from the surface of the upper plate 50, the joint surface between the upper plate 50 and the lower plate 51, and the bottom surface of the lower plate 51, respectively. Come. To obtain an echo distribution of the reflected waves from the junction of the upper plate 50 and lower plate 51 sets the gate A53 to the position of the bonding surface echo I ₁ 17 represented by the matrix portion waveform. Similarly,
To obtain the bottom plate bottom echo distribution, B ₁
The gate B54 is set at the echo position. In the figure, W ₁ ,
W ₂ and W 3 are respectively W ₁ = t ₁ / (2 × C ₁ ) and W ₂ = t ₂ / (2
× C ₂ ) and W ₃ = t ₃ / (2 × C ₃ ).

FIG. 9 shows a reflection echo distribution diagram in the gate set as described above. The horizontal axis of the graph indicates the scanning distance of the ultrasonic probe, and the vertical axis indicates the reflected peak value appearing in the gate. The scan graph shown at gate A in FIG. 9 (a) shows the change in I ₁ echo height when scanning the ultrasonic probe across the spot weld. The reflected wave from the joint between the upper plate and the lower plate has a high peak value on both sides of the scanning graph due to the echo of the bottom surface of the upper plate. Lower. On the other hand, the gate B shown in FIG.
The scan chart is the distribution of the lower bottom echo height, either side of the scan graph a and the echo height second bottom echo 18 of the upper plate (I ₂ echo) is increased. A B ₁ echo 19 of the central portion of the scan chart from the lower plate bottom, is because there is a turnover B ₁ echo and I ₂ echo of little echo height on both sides of the echo is lowered. Two points at which the peak value increase rate on both sides of these scanning graphs becomes zero are extracted, and the distance between these two points is defined as the spot welding dimension. However, this method has a problem that it cannot be applied to a case where the surface of the spot weld has a depression.

That is, as shown in FIG.
The actual shape of the welded part has a dent on both the flaw detection surface and the anti-flaw detection surface.
In this case, the ultrasonic flaw detection waveform is
S echo 10, which is a reflected wave from the surface obtained in
Δt_Two/ (2 × C₁) S 'Eco delayed by time only
It becomes-14. Also, the dent on the flaw detection surface side
B which is a reflected wave from the bottom surface due to the dent on the inspection surface side₁Eco
-19 is Δt_Three/ (2 × C _Three) Only time that there is no dent
Shorter. In the figure, W1 and W2 are obtained as described above.
It is. Also, W₁ ^,, W_Two ^,, W_Three ^,Are as follows. W₁ ^,= T₁ ^,/ (2 × C₁) = W₁× Δt_Two/ (2 × C₁) W_Two ^,= T_Two ^,/ (2 × C_Two) = W_Two-Δt_Two/ (2 × C_Two) W_Three ^,= T_Three ^,/ (2 × C_Three) = W_Three-Δt_Three/ (2 × C_ThreeFig. 11 shows the relationship between the flaw detection gate and the echo reflected by the surface irregularities.
Show the staff. Gate A, Gate set by base material flaw detection waveform
The position of B is not appropriate in the dent flaw detection waveform. this
As shown, the joint surface echo or
The reflection time of the bottom echo is shifted,
From the flaw detection gate to be set,
There is a problem that the cord is disconnected and no signal is obtained.

Therefore, there is no problem when the range to be detected is constant, but when there is unevenness on the front and back surfaces of the test object and the range changes, it is necessary to change the gate range each time. However, when the unevenness state of the object to be inspected is not constant depending on the inspection object, it is necessary to set the inspection object one by one, which is not practical.

[0012]

SUMMARY OF THE INVENTION It is an object of the present invention to provide an object to be inspected having a large dimension and an irregularity having a surface roughness greater than or equal to a surface roughness without being affected by the irregularity. It is another object of the present invention to provide an ultrasonic inspection apparatus and an inspection method thereof that efficiently and efficiently measure dimensions of flaws, shape discontinuities, material discontinuities, and the like.

[0013]

According to the present invention, a delay member having a thickness greater than the height of the irregularities and a shape along the irregularities is placed on the surface of the inspected object having irregularities deeper than the surface roughness. Apply a couplant to transmit ultrasonic waves between test objects,
The ultrasonic probe scans over the delay member, and scans the ultrasonic probe from above the coordinate position signal in the scanning direction to obtain a beam path represented by a gray scale using the coordinate position in the scanning direction and the reflected peak value by two. A cross-sectional B-scope image is displayed as an axis, and this is called a peak value gradation cross-sectional scanning graph (cross-sectional scanning graph). A predetermined gradation level is set for a flaw image displayed on the cross-sectional scanning graph. Is measured as the dimension of the discontinuous portion.

That is, the present invention provides an ultrasonic probe for detecting the shape of an object having irregularities deeper than the surface roughness by transmitting and receiving ultrasonic waves from the side having the irregularities, and an ultrasonic probe for detecting the shape of the object. A delay member having a thickness equal to or greater than the height of the irregularities disposed between the probe and a driving device that scans and drives the ultrasonic probe on the delay member; and And a position signal output device for outputting a moving distance. As surface roughness, J
400 μm specified in ISB0601
(Rmax 400S), and in the present invention, a retarder is provided on the surface of a material having irregularities due to the roughness. The delay material may be any of metal, non-metal, and resin, and it is preferable to provide the same as the test object.

Further, the present invention provides an ultrasonic probe for detecting the shape of a test object having irregularities deeper than the surface roughness by transmitting and receiving ultrasonic waves from the side having the irregularities, and transmitting a pulse to the ultrasonic probe. And a receiver unit that amplifies a signal received by the ultrasonic probe, and a thickness equal to or greater than the height of the irregularities provided between the ultrasonic probe and the test object. A delay material having the same, an ultrasonic transmission coupling medium provided between the delay material and the surface of the test object, and scanning of an ultrasonic probe on the surface of the delay material to record a coordinate position in a scanning direction and an ultrasonic waveform. Signal recording device, display means for displaying a cross-sectional B-scope image with the beam path gray scaled by the recorded coordinate position and reflected peak value as two axes, and a range of coordinate positions exceeding a preset gray level. The discontinuous part of the test object based on In ultrasonic inspection apparatus characterized by having a calculating means for output.

The thickness of the delay member is set so as to generate an echo of the bottom surface of the delay member at a position beyond the range of the volume to be inspected including the irregularities on the surface of the inspected object and the couplant filled in the irregularities. It is preferable that a plurality of repetitions of the echo reflected from the surface of the test object be selected so as to be within a range of one repetition of the echo reflected from the bottom surface of the delay member.

Further, the present invention relates to an ultrasonic inspection method for detecting the shape of a test object having irregularities deeper than the surface roughness by an ultrasonic probe which transmits and receives ultrasonic waves from the side having the irregularities. A delay member having a thickness equal to or greater than the height of the unevenness is arranged between the ultrasonic probe and the test object, and an ultrasonic transmission coupling medium is filled between the delay material and the test object. And scanning the ultrasonic probe on the surface of the delay member.

Further, the present invention relates to an ultrasonic inspection method for detecting a welding width of a spot weld by an ultrasonic probe which transmits and receives ultrasonic waves, wherein an ultrasonic probe is provided between the ultrasonic probe and the spot weld. A delay material having a thickness equal to or greater than the depth of the recess of the spot weld is arranged, and an ultrasonic transmission couplant is filled between the delay material and the recess, so that the ultrasonic probe is The scanning is performed on the surface of the delay member.

The present invention also relates to an ultrasonic inspection method for detecting the reverse welding width of a butt weld by an ultrasonic probe that transmits and receives ultrasonic waves, wherein the ultrasonic probe and the front side of the butt weld are detected. A delay member having a thickness equal to or greater than the depth of the recess formed on the front side of the butt weld portion is disposed between the delay member and the ultrasonic transmission couplant between the delay member and the recess. And scanning the ultrasonic probe on the surface of the delay member.

The thickness of the delay material is set so as to generate a bottom echo of the delay material at a position beyond the range of the volume to be inspected including the irregularities on the surface of the inspected object and the couplant filled in the irregularities. And the thickness of the delay member is such that a plurality of repetitions of the echo reflected from the surface of the test object are within a range of one repetition of the echo reflected from the bottom surface of the delay member. It is preferable to be selected as follows.

The present invention can be applied to a direct contact method, a gap method, and a local immersion method, which have high ultrasonic inspection efficiency.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an apparatus configuration for an ultrasonic inspection test of a spot weld having a concave surface according to the present invention. A delay member 2 having a known thickness is placed on a test object 4 via a couplant 3 that propagates ultrasonic waves, and the ultrasonic probe 1 is scanned on the delay member 2. A position signal generator 6 is connected to the ultrasonic probe 1 to generate a coordinate signal according to a scanning distance.
The ultrasonic probe 1 supplies a transmission pulse and receives a reflected signal with the ultrasonic flaw detector 5, and the ultrasonic reception signal and the position signal are recorded in the waveform signal recording device 7. The couplant 3 is
It is provided to achieve acoustic coupling when the ultrasonic beam oscillated from the ultrasonic probe 1 is made incident on the inspection object 4 without passing through a space, and oil such as machine oil, glycerin, water, and the like are provided. Used.

FIG. 2 shows an ultrasonic waveform when the inspection surface has a dent. The delay member 2 having a thickness larger than the depth of the recess 3 is placed on the inspection surface. The delay member 2 is sufficiently thicker than the surface roughness of the inspection surface, and a flat plate made of the same material as the inspection object is used. In the sound part, the ultrasonic beam 8 transmitted from the ultrasonic probe 1 propagates through the delay member 2, and when entering the test object 4, a part of the ultrasonic wave
(S echo). Further, the ultrasonic wave propagated into the object to be inspected travels through the material and is reflected on the bottom surface of the object to be inspected. This reflected wave is repeatedly reflected between the inspection surface, a first bottom echo 11 the first reflected wave (B ₁₁ echoes), the reflected wave a second time the second bottom echo 12 of (B ₁₂ echoes).

On the other hand, in the concave portion, the ultrasonic wave which has entered the couplant 3 staying in the concave portion from the delay member is reflected on the surface of the test object, and a surface echo 14 (S 'echo) is generated.
This echo has a propagation time Δt / in the couplant (sound speed Cs) at a pit depth Δt compared to the S echo 10 in the sound part.
A time delay will occur by 2Cs. Further, since the bottom surface echo 15 (B ₁ 'echo) of the dent has a smaller thickness by the surface dent Δt, the propagation time from the S' echo is shorter by Δt / 2C1 than that of the sound portion.

As described above, in ultrasonic flaw detection having a concave surface, there is a difference in ultrasonic propagation time between a reflected wave in a healthy part and a reflected wave in a concave part.

FIG. 3 shows a scanning graph of the peak value gradation section according to the present invention. This scanning graph is based on the recorded ultrasonic A-scope waveform signal, and the horizontal axis 41 (X axis) is a position signal, and the vertical axis 42 (Z axis) is a beam path of a reflected light peak value. 6 is a scan graph of an axis. The Z-axis of this scanning graph divides the beam path of the A-scope waveform, and the reflected wave peak value corresponding to each beam path is displayed in color gradation 43 from blue to red with respect to 0% to 127%.

From this figure, it can be seen that B ₁ echo 11 and B ₂ echo 12 are displayed at equal intervals in the depth direction from the S echo 10 in the healthy part. In the surface recess 'appears (echo, then B ₁ delay body bottom echo 13 recess surface echo 14 S)' after the (B _T Echo) the echo 15 has emerged.

Here, the concave portion on the surface is defined as follows. That is, the S echo disappears, the S 'echo appears, and the B1' echo appears, and its peak level is 1
The range is more than 00%. Then, the length 45 of the concave portion is obtained from the peak value gradation sectional scanning graph of FIG. In this way, the peak value level for the discontinuous portion is determined in advance by an experiment, and the size of the discontinuous portion can be measured by calculating the coordinate position exceeding this level from the color gradation display.

Further, in the present apparatus, by recording and storing all the waveform data of the A scope 40 for displaying the scanning graph, the A scope corresponding to the scanning graph cursor position can be displayed. As a result, if there is a significant error between the actual size of the dent and the value measured by this device, review the A-scope waveform data and set an appropriate peak value level again to reduce the actual value to the actual size. Can be corrected.

FIG. 4 shows the result of flaw detection of a spot weld having a recess on both the front and back surfaces. The ultrasonic probe 1 is placed on the base material together with the delay member 2 via the couplant 3 and is subjected to flaw detection. The delay member 2 has a member thicker than the depth of the recess of the spot welding and is made of a flat plate. The ultrasonic beam 8 advances through the delay member 2 and enters the upper plate 50. Ultrasonic beam entering becomes I ₁ echoes reflected by the top plate of the bottom. This is because ultrasonic waves do not propagate to the lower plate because the upper plate and the lower plate are not joined. The upper plate bottom echo is repeatedly reflected, resulting in I ₂ echo after I ₁ echo. Next, the ultrasonic probe 1 is scanned in the direction of the spot welds, the I ₁ echoes to the ultrasonic approaches the weld metal section propagating from the upper plate to the lower plate disappeared, instead of the lower plate B ₁ echo 19 is a bottom echo appears. In this case the surface of the spot weld, the back surface of the recessed shape B _T Echo 13, S 'echo 14 to appear. The appearance of the echo is represented by an echo height gradation cross-sectional scanning graph, so that the change in the beam path caused by the surface depression can be directly known. In addition, the size of the spot weld is previously determined by an experiment, for example, as the reflected echo height of the B ₁ '
If it is defined as 0%, the dimension D shown in FIG. The spot welding dimension 48 thus determined can be used as a management reference value for managing the quality of spot welding.

FIG. 5 is a cross-sectional view showing an example of the measurement of the undercut dimension in a butt welded portion formed by multi-pass welding using a filler in a groove. The overlaid surface is removed by a grinder finish, and the surface of the butt weld test piece 55 having a slightly concave portion has gentle irregularities. A delay member 2 made of a flat plate thicker than the depth of the concave portion is placed on the surface of the concave portion via the couplant 3, and the ultrasonic probe 1 is scanned from above, and the reflected ultrasonic beam 8 is reflected. The obtained waveform is shown in an echo height gradation sectional scanning graph. B ₁ echo 19 of the base metal is observed at a high peak value on either side of the weld back waves echo 28 in the scan chart. At this time, if the definition of the backwash size is previously set to 50% in the level of the reflected wave from the backwash in an experiment, the backwash size can be measured from the main scanning graph.

FIG. 6 shows a retarder made of a flat plate according to the present invention.
It shows the relationship between the thickness of the wave and the reflected waveform in the ultrasonic wave.
is there. Thickness T of delay material 2₀20 (Sound speed C₀30), inspected object 4
Thickness T₁(Sound speed C₁), The sound velocity C at the surface depression_SIn
The thickness of the couplant 3 is Δt22. Bottom eco of delay material 2
ー (B_T1Echo 70) is C₀× T₀Time W_FourOccurs at 60
You. In addition, the bottom echo of the delay member 2 passes through the same time.
B_T2It repeatedly occurs as an echo 71. Also, the recess Δ
The surface echo (S 'echo 14) resulting from the presence of t is C
_S× Δt time W_FiveOccurs at 61. T after this echo₁´2
The reflected wave corresponding to the thickness of 3 is B₁₁'Echo 15, B₁₂´e
Koh 65, B₁₃'Echo 66 repeatedly occurs. Where late
When the thickness of the rolled material 2 is improperly set B_TEcho echo
The return interval is short, and S 'eco
-And the appearance of B 'echo make reflected echo complicated
It becomes impossible to separate and identify. Therefore, what should be inspected
The range is within the repetition of the bottom echo of the delay material 2.
It is necessary to select such a thickness of the delay member 2 as described above. This late
Sheet thickness T₀Is T₀> C₀｛(Δt / Cs) +
(NT₁ / C₁)｝ Where n is the dent required for inspection
Indicates the number of repetitions of the bottom echo.

FIG. 7 is a sectional view of an ultrasonic probe automatic scanning apparatus for detecting a flaw-detected surface having irregularities on the surface according to the present invention. A delay material shoe 90 conforming to the uneven shape of the surface, an ultrasonic probe 89 scanning over the delay material, an ultrasonic probe holder 87 holding the ultrasonic probe, and a spring pressing the ultrasonic probe. It comprises a belt 88 for driving the guide rod 88, a pulley 84 for driving the belt, a gear group 82 for driving the pulley, and a drive motor 80. FIG. 7A shows the delay material shoe 90.
FIG. 7 (b) shows a case where the shape of the delay material shoe 90, which follows a curved surface when the surface of the test object is a curved surface, matches the curved surface.

As shown in FIG. 7 (b), the shape of the delay material shoe 90 that directly contacts the object to be inspected is a shape that matches the plane and the curved surface of the object to be inspected. By making the plate thickness parallel, the ultrasonic beam incident on the object to be inspected can always be perpendicularly incident on the object to be inspected. For this purpose, a linear or curved guide rail 86 having the same shape as the object to be inspected is provided, and a base unit 83 that drives the guide rail is driven by a timing belt 85 that is flexible with respect to a curved surface. Further, the scanning unit is hermetically filled with a couplant 81 such as oil to keep the contact between the delay material shoe and the ultrasonic probe stable. The couplant to be sealed and filled shall not enter the drive unit.

The use of such an ultrasonic probe automatic scanning device makes the operation easier than a method in which a delay member is placed directly on the object to be inspected and the inspector scans the ultrasonic probe thereon. In addition, when many measurement points are automatically measured, automation of the measurement is facilitated, and mass-production measurement is possible.

[0036]

According to the ultrasonic flaw detector and method therefor according to the present invention, it is possible to efficiently measure the shape of a test object having irregularities on the front and back surfaces, dimensions of joints or flaws without being affected by irregularities. Since it can be easily performed, a remarkable effect can be obtained in which a dimension of a joint region or a flaw that cannot be visually observed from the front surface or an uneven shape that cannot be observed from the back surface can be easily measured from the front surface.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of an ultrasonic inspection apparatus according to the present invention.

FIG. 2 is an explanatory diagram showing an ultrasonic waveform for an object to be inspected having a concave surface.

FIG. 3 is a cross-sectional scanning graph of a crest-value gradation for a test object having a concave surface according to the present invention.

FIG. 4 is a cross-sectional scanning graph of a peak value gradation in which a spot weld is detected according to the present invention.

FIG. 5 is a cross-sectional scanning graph of a crest value gradation in which flaws in a butt weld are detected according to the present invention.

FIG. 6 is a principle diagram for explaining the relationship between the thickness of the delay member and the ultrasonic waveform.

FIG. 7 is a sectional structural view of the ultrasonic probe automatic driving device according to the present invention.

FIG. 8 is an explanatory view of the principle of performing water immersion ultrasonic testing of a two-ply plate according to a conventional method.

FIG. 9 is a diagram showing the principle of measuring the welding dimensions of a spot welded portion by a conventional method.

FIG. 10 is a principle diagram of ultrasonic flaw detection in the case where a surface has a concave portion according to a conventional method.

FIG. 11 is an explanatory view of a gate in ultrasonic flaw detection by a conventional method.

[Explanation of symbols]

1 ... Ultrasonic probe, 2 ... Delay material, 3 ... Coupling medium, 4 ... Test object, 5 ... Ultrasonic flaw detector, 6 ... Position signal generator, 7 ... Waveform recording processing device, 8 ... Ultrasonic beam , 10 ... S echo, 11 ... B
₁₁ Echo, 12 ... B ₁₂ echo, 13 ... B _T echo, 14 ... S'
Echo, 15 ... B _{1 1} 'echo, 17 ... I ₁ echo, 18 ... I ₂ echo, 19 ... B _{1 echo, 20 ... T 0, 21 ...} T 1, 22 ... Δt, 2
3 ... T ₁ ', 28 ... penetration echo, 30 ... sound velocity C _0, 31 ... sound velocity C _1, 40 ... A scope, 41 ... coordinate position (X axis), 42 ... soundpath (Z axis), 43 ... floor Tone display color, 45 ... dent length, 46
... cursor 48 ... spot weld size, 53 ... flaw detection gate A, 54 ... flaw detection gate B, 55 ... welded specimens, 60 ... W _4, 61
_{... W 5, 62 ... W 6} , 65 ... B 12 ' echo, 66 ... B _13' echo, 70 ... B _T1 echo, 71 ... B _T2 echo, 80 ... motor, 81
... filled couplant, 82 ... gear group, 83 ... base unit, 84
... pulley, 85 ... timing belt, 86 ... guide rail,
87… Ultrasonic probe holder, 88… Spring, 89… Ultrasonic probe, 90… Delay material shoe.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yutaka Murai 3-2-1 Sachimachi, Hitachi City, Ibaraki Prefecture Within Hitachi Engineering Co., Ltd. (72) Inventor Takajo Matsuo 3-2 Sachimachi, Hitachi City, Ibaraki Prefecture No. 1 Hitachi Engineering Co., Ltd. F-term (reference) 2G047 AB07 BB04 BB05 BB06 DA01 DA02 EA13 GA19 GB27 GB28 GE03 GF06

Claims (6)

[Claims] 1. An ultrasonic inspection apparatus having an ultrasonic probe for detecting the shape of an object having irregularities deeper than the surface roughness by transmitting and receiving ultrasonic waves from the side having the irregularities. An ultrasonic inspection apparatus, wherein a delay member having a thickness equal to or greater than the height of the unevenness is arranged between the unevenness side and the ultrasonic probe. 2. An ultrasonic probe for detecting the shape of a test object having irregularities deeper than the surface roughness by transmitting and receiving ultrasonic waves from the side having the irregularities, and an ultrasonic probe for detecting the shape of the test object and the ultrasonic probe. A delay member having a thickness equal to or greater than the height of the irregularities disposed therebetween, a driving device for scanning and driving the ultrasonic probe on the delay member, and outputting a moving distance of the ultrasonic probe And a position signal output device. 3. An ultrasonic probe for detecting the shape of a test object having irregularities deeper than the surface roughness by transmitting and receiving ultrasonic waves from the side having the irregularities, and a pulser for supplying a transmission pulse to the ultrasonic probe. Unit, a receiver unit that amplifies the signal received by the ultrasonic probe, and a delay member having a thickness equal to or greater than the height of the unevenness provided between the ultrasonic probe and the test object, An ultrasonic transmission medium provided between the delay member and the surface of the test object, and a waveform signal recording for scanning an ultrasonic probe on the surface of the delay member and recording a coordinate position in a scanning direction and an ultrasonic waveform. An apparatus, display means for displaying a cross-sectional B-scope image with the beam path gray scaled by the recorded coordinate position and the reflected wave height value as two axes, and the coordinate system based on a range of coordinate positions exceeding a predetermined gray scale level. A calculator that detects discontinuities in the device under test Ultrasonic inspection apparatus characterized by having and. 4. An ultrasonic inspection method for detecting the shape of an object to be inspected having irregularities deeper than the surface roughness by an ultrasonic probe for transmitting and receiving ultrasonic waves from the side having the irregularities,
A delay member having a thickness equal to or greater than the height of the irregularities is arranged between the ultrasonic probe and the test object, and the ultrasonic transmission couplant is filled between the delay member and the test object. Let me
An ultrasonic inspection method, wherein the ultrasonic probe is caused to scan on a surface of the delay member. 5. An ultrasonic inspection method for detecting a welding width of a spot weld by an ultrasonic probe that transmits and receives ultrasonic waves, wherein the spot weld is located between the ultrasonic probe and the spot weld. A delay material having a thickness equal to or greater than the depth of the dent is arranged, and an ultrasonic transmission couplant is filled between the delay material and the dent, and the ultrasonic probe is brought into contact with the surface of the delay material. An ultrasonic inspection method, characterized in that scanning is performed by using (1). 6. An ultrasonic inspection method for detecting a reverse welding width of a butt weld by an ultrasonic probe which transmits and receives ultrasonic waves, wherein the ultrasonic probe and the front side of the butt weld are detected. A delay material having a thickness equal to or greater than the depth of the dent formed on the front side of the butt weld is disposed therebetween, and an ultrasonic transmission couplant is filled between the delay material and the dent, An ultrasonic inspection method, wherein the ultrasonic probe is caused to scan on a surface of the delay member.