CN212932506U - Contrast reflector test block for flaw detection of middle part of welding seam of building net rack by multiple reflection method - Google Patents
Contrast reflector test block for flaw detection of middle part of welding seam of building net rack by multiple reflection method Download PDFInfo
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- CN212932506U CN212932506U CN202021870656.6U CN202021870656U CN212932506U CN 212932506 U CN212932506 U CN 212932506U CN 202021870656 U CN202021870656 U CN 202021870656U CN 212932506 U CN212932506 U CN 212932506U
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- 238000012360 testing method Methods 0.000 title claims abstract description 129
- 238000001514 detection method Methods 0.000 title claims abstract description 20
- 238000003466 welding Methods 0.000 title claims abstract description 18
- 238000001028 reflection method Methods 0.000 title claims abstract description 17
- 230000007547 defect Effects 0.000 claims abstract description 15
- 238000005259 measurement Methods 0.000 abstract 1
- 239000000463 material Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000002360 preparation method Methods 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000002310 reflectometry Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 230000002238 attenuated effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
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Abstract
The utility model discloses a contrast reflector test block for multi-reflection flaw detection of defects in the middle of welding seams of building net racks, which comprises a test block body, wherein the test block body is shaped as a section of a partial circular column, and a first side surface and a second side surface of the test block body are parallel; a plurality of through holes are formed in the test block body through the first side face and the second side face, and the axis of each through hole is perpendicular to the corresponding angular bisector of the extrados of the test block body; the distance between each through hole and the outer arc surface of the test block body is different, and the distance between each through hole and the end surface of the test block body is different. The inner surface of the test block body is an arc surface, the shape of the test block body is closer to the actual section of the pipe fitting, and therefore the test block measurement result is closer to the actual detection result of the engineering. The positions of the through holes do not interfere with each other, the test block can meet the requirement that the ultrasonic waves only pass through a certain through hole after being reflected once or for multiple times, and the ultrasonic flaw detection can be carried out by utilizing a reflection method or a multiple reflection method.
Description
Technical Field
The utility model belongs to the technical field of the building engineering material, concretely relates to contrast reflector test block that building rack welding seam middle part defect multiple reflection method was detected a flaw.
Background
The welding seam flaw detection of the building steel structure net rack is characterized in that firstly, a distance-amplitude curve (DAC curve) for flaw detection is manufactured by using a contrast reflector, and the existing contrast reflector can only be manufactured by adopting an ultrasonic direct injection method. The construction site environment of the building net rack is complex, many weld seam defects detection needs to adopt a reflection method or a multiple reflection method, the pipe fitting section of the net rack is a circular ring, the inner surface and the outer surface of the pipe fitting are curved surfaces, the inner surface of the pipe fitting cannot be processed under most conditions, the roughness difference of the inner surface and the outer surface is large, ultrasonic waves are also greatly attenuated after being reflected by the inner surface of the pipe wall, and the fact that a DAC curve manufactured by a direct projection method is used for the multiple reflection method and has large weld seam defect detection errors. There is therefore a need for a test block suitable for fitting to a rack in a circular configuration and for use in a reflectometry or multiple reflectometry.
Disclosure of Invention
For solving the problem that exists among the prior art, the utility model aims to provide a contrast reflector test block that building rack welding seam middle part defect multiple reflection method was detected a flaw, this test block is applicable to the ring shape in the pipe fitting of rack and can be suitable for the test block of reflection method or multiple reflection method.
A contrast reflector test block for multi-reflection flaw detection of defects in the middle of a welding seam of a building grid frame comprises a test block body, wherein the test block body is in the shape of a section of partial circular column, and a first side surface and a second side surface of the test block body are parallel; a plurality of through holes are formed in the test block body through the first side face and the second side face, and the axis of each through hole is perpendicular to the corresponding angular bisector of the extrados of the test block body; the distance between each through hole and the outer arc surface of the test block body is different, and the distance between each through hole and the end surface of the test block body is different.
Preferably, the position of each through hole satisfies the following condition:
ultrasonic waves incident from the extrados of the test block body are reflected by the intrados of the test block body or reflected by the intrados and then the extrados and then pass through only one through hole.
Preferably, among the plurality of through holes, the distance L1 between the through hole closest to the end face of the test block body and the end face is not less than 2h × tan α, wherein h is the wall thickness of the test block body, and α is the incident angle of the ultrasonic wave.
Preferably, the diameter of the through hole is 3mm, and the distance between the first side surface and the second side surface is 20 mm.
Preferably, the through holes comprise a first through hole, a second through hole, a third through hole and a fourth through hole, the first through hole, the third through hole, the fourth through hole and the second through hole are sequentially arranged along the direction from the end surface of one side of the test block body to the end surface of the other side of the test block body, the included angle between the plane where the axes of the first through hole and the third through hole are located and the radial direction of the test block body is not smaller than the incident angle of ultrasonic waves, and the included angle between the plane where the axes of the fourth through hole and the second through hole are located and the radial direction of the test block body is not smaller.
Preferably, the distance L2 between the intersection point of the plane where the axes of the first through hole and the third through hole are located and the inner arc surface of the test block body and the intersection point of the plane where the axes of the fourth through hole and the second through hole are located and the inner arc surface of the test block body is more than or equal to 3h multiplied by tan alpha, wherein h is the wall thickness of the test block body, and alpha is the incident angle of ultrasonic waves.
Preferably, the distance between the axis of first through-hole and the test block body extrados top is 3mm, the distance between the axis of second through-hole and the test block body extrados top is 8mm, the distance between the axis of third through-hole and the test block body extrados top is 13mm, the distance between the axis of fourth through-hole and the test block body extrados top is 18mm, the distance between the axis of fourth through-hole and the test block body extrados top is 5 mm.
Preferably, the radius R1 of the extrados surface, the radius R2 of the intrados surface and the wall thickness h of the test block body satisfy the relationship:
R2＝R1-h。
the utility model discloses following beneficial effect has:
the utility model discloses in the contrast reflector test block that building rack welding seam middle part defect multiple reflection method was detected a flaw, the shape of test block body was one section partial ring post, and this test block body is for current test block, and the internal surface is the arc surface, and the shape is more close actual pipe fitting cross-section, consequently utilizes the utility model discloses a contrast reflector test block measuring result is more close the actual testing result of engineering. In addition, the distance between each through hole and the outer arc surface of the test block body is different, and the distance between each through hole and the end surface of the test block body is different, so that the positions between the through holes of the utility model do not interfere with each other, the test block can meet the requirement that the ultrasonic wave only passes through a certain through hole after being reflected once or for multiple times, and then the ultrasonic flaw detection can be carried out by utilizing a reflection method or a multiple reflection method, thereby avoiding the problem that the inner surface of a pipe fitting cannot be processed, the roughness difference of the inner surface and the outer surface is larger, the ultrasonic wave has larger attenuation after being reflected by the inner surface of the pipe wall, and the DAC curve manufactured by a direct projection method is used for; in addition, the through holes in the distribution form can meet the requirement of measuring different positions of the test block, and obtain corresponding distance-amplitude curves, so that the result is more comprehensive.
Furthermore, the distance L1 between the nearest through hole on the end face of the test block body and the end face is more than or equal to 2h multiplied by tan alpha, wherein h is the wall thickness of the test block body, and alpha is the incident angle of ultrasonic waves, and the requirement can ensure that the second through hole of the first through hole in the test block can be used for making a distance-amplitude curve by a primary reflection method.
Furthermore, the distance L2 between the intersection point of the plane where the axes of the first through hole and the third through hole are located and the inner arc surface of the test block body and the intersection point of the plane where the axes of the fourth through hole and the second through hole are located and the inner arc surface of the test block body is not less than 3h multiplied by tan alpha, wherein h is the wall thickness of the test block body, and alpha is the incident angle of ultrasonic waves, and the requirement can ensure that the first through hole and the fourth through hole can be used for making a distance-amplitude curve by secondary reflected waves.
Further, the radius R1 of the extrados surface of the test block body, the radius R2 of the intrados surface and the wall thickness h satisfy the following relation: r2 ═ R1-h, this requirement ensures that the coupon is part of a circular ring of tubing.
Drawings
FIG. 1(a) is a front view of a reference reflector test block of the present invention;
FIG. 1(b) is a top view of a reference reflector test block of the present invention;
FIG. 1(c) is a side view of a reference reflector test block of the present invention;
FIG. 2 is an isometric view of a reference reflector coupon of the present invention;
FIG. 3 is a diagram showing the distance-amplitude curve application of the first and second reflected waves;
fig. 4 is a graph comparing the primary reflection wave and the secondary reflection wave of the reference reflector test block of the present invention with the DAC curve produced by the conventional reference reflector test block.
In the figure, 1-a test block body, 2-an intrados surface, 3-an extrados surface, 4-1-a first through hole, 4-2-a second through hole, 4-3-a third through hole, 4-4-a fourth through hole, 5-a first side surface, 6-a second side surface, 7-an end surface, 8-an oblique probe, an A-primary reflection wave region, a B-secondary reflection wave region and a direct wave region.
Detailed Description
The invention is further described with reference to the following figures and examples.
Referring to fig. 1(a) -fig. 1(c), the utility model discloses a contrast reflector test block of building rack welding seam middle part defect multiple reflection method flaw detection, including test block body 1, the shape of test block body 1 is a section part ring post, and first side 5 and second side 6 of test block body 1 are parallel; a plurality of through holes are formed in the test block body 1 through the first side surface 5 and the second side surface 6, and the axis of each through hole is perpendicular to the corresponding angular bisector of the extrados 3 of the test block body 1; the distance between each through hole and the outer arc surface 3 of the test block body 1 is different, and the distance between each through hole and the end surface 7 of the test block body 1 is different.
As a preferred embodiment of the present invention, referring to fig. 3, the position of each through hole satisfies the following condition: ultrasonic waves incident from the extrados 3 of the test block body 1 are reflected by the intrados 2 of the test block body 1 or reflected by the intrados 2 and then reflected by the extrados 3 and then pass through only one through hole.
As a preferred embodiment of the present invention, referring to FIG. 1(a), among the plurality of through holes, a distance L1 between the through hole closest to the end surface 7 of the specimen body 1 and the end surface 7 is not less than 2h x tan α, where h is the thickness of the specimen body 1 and α is the incident angle of the ultrasonic wave.
As a preferred embodiment of the present invention, referring to fig. 3, the diameter of the through hole is 3mm, and the distance between the first side surface 5 and the second side surface 6 is 20 mm.
As a preferred embodiment of the present invention, referring to fig. 1(a) -1 (c), 2 and 3, the through holes include a first through hole 4-1, a second through hole 4-2, a third through hole 4-3 and a fourth through hole 4-4, the first through hole 4-1, the third through hole 4-3, the fourth through hole 4-4 and the second through hole 4-2 are sequentially arranged along a direction from one side end surface to the other side end surface of the test block body 1, a radial included angle between a plane where axes of the first through hole 4-1 and the third through hole 4-3 are located and the test block body 1 is not smaller than an incident angle of the ultrasonic wave, and a radial included angle between a plane where axes of the fourth through hole 4-4 and the second through hole 4-2 are located and the test block body 1 is not smaller than an incident angle of the ultrasonic wave.
As a preferred embodiment of the present invention, referring to FIG. 1(a), the distance L2 between the intersection point of the plane of the first through hole 4-1 and the third through hole 4-3 and the intrados 2 of the test block body 1 and the intersection point of the plane of the fourth through hole 4-4 and the second through hole 4-2 and the intrados 2 of the test block body 1 is not less than 3h × tan α, wherein h is the wall thickness of the test block body 1, and α is the incident angle of the ultrasonic wave.
As a preferred embodiment of the present invention, referring to FIG. 1(a), the distance between the axis of the first through hole 4-1 and the top of the outer arc surface 3 of the test block body 1 is 3mm, the distance between the axis of the second through hole 4-2 and the top of the outer arc surface 3 of the test block body 1 is 8mm, the distance between the axis of the third through hole 4-3 and the top of the outer arc surface 3 of the test block body 1 is 13mm, the distance between the axis of the fourth through hole 4-4 and the top of the outer arc surface 3 of the test block body 1 is 18mm, and the distance between the axis of the fourth through hole 4-4 and the top of the inner arc surface 2 of the test block body 1 is 5 mm.
As a preferred embodiment of the present invention, referring to fig. 1(c), the radius R1 of the extrados surface 3, the radius R2 of the intrados surface 2 and the wall thickness h of the test block body 1 satisfy the following relationship:
R2＝R1-h。
as the utility model discloses preferred embodiment, R1 and R2 cambered surface are the same with the rack pipe fitting that detects or are close, and the roughness of the interior cambered surface of test block body 1 inside and outside cambered surface is the same with on-the-spot pipe fitting inside and outside wall or are close.
The utility model discloses the preparation steel of test block body 1 adopts on-the-spot rack material or close material, during the preparation, cuts along the axial of pipe fitting, cuts out the test block body 1 of predetermineeing the width, as shown in fig. 1(c), the axis of through-hole is perpendicular with 1 both sides face of test block body.
The utility model discloses contrast reflector test block carries out primary reflection wave and secondary reflection wave, and the preparation distance-wave amplitude curve is shown in figure 3. As shown in fig. 4, the comparison reflector test block of the present invention adopts the first manufacturing distance-amplitude curve 3 and the second reflected wave manufacturing distance-amplitude curve 2, and the distance-amplitude curve manufactured by the direct wave of the existing reflector is curve 1: the gain values of the curves 2 and 3 are higher than that of the curve 1, and the curves 2 and 1 have different variation trends, so that the gain dB compensation can not be simply carried out and is overlapped with the curve 1. This is because the surface topography of the test block has a complex effect on attenuation after multiple reflections of the ultrasonic wave. Therefore, the utility model discloses contrast reflector test block can be accurate drawing rack welding seam detection distance-wave amplitude curve, makes scientific evaluation to the welding seam.
Claims (8)
1. A contrast reflector test block for multi-reflection flaw detection of defects in the middle of welding seams of a building grid frame is characterized by comprising a test block body (1), wherein the test block body (1) is in the shape of a section of a partial circular column, and a first side surface (5) and a second side surface (6) of the test block body (1) are parallel; a plurality of through holes are formed in the test block body (1) through the first side surface (5) and the second side surface (6), and the axis of each through hole is perpendicular to the corresponding angular bisector of the outer arc surface (3) of the test block body (1); the distance between each through hole and the outer arc surface (3) of the test block body (1) is different, and the distance between each through hole and the end surface (7) of the test block body (1) is different.
2. The test block of the contrast reflector for the multi-reflection flaw detection of the defects in the middle of the welding line of the building grid frame according to claim 1, wherein the position of each through hole satisfies the following conditions:
ultrasonic waves incident from the extrados (3) of the test block body (1) are reflected by the intrados (2) of the test block body (1) or reflected by the intrados (2) and then reflected by the extrados (3) and then pass through only one through hole.
3. The test block of the contrast reflector for the multi-reflection flaw detection of the defects in the middle of the welding line of the building grid frame according to the claim 1 is characterized in that the distance L1 between the through hole closest to the end face (7) of the test block body (1) and the end face (7) is more than or equal to 2 hxtan alpha, wherein h is the wall thickness of the test block body (1) and alpha is the incidence angle of ultrasonic waves.
4. The test block of a contrast reflector for multi-reflex flaw detection of a defect in the middle of a weld of a building grid according to claim 1, wherein the diameter of the through hole is 3mm, and the distance between the first side surface (5) and the second side surface (6) is 20 mm.
5. The test block of the contrast reflector for detecting the flaw of the middle part of the welding seam of the building net rack according to the claim 1 by the multiple reflection method, the ultrasonic testing device is characterized in that the through holes comprise a first through hole (4-1), a second through hole (4-2), a third through hole (4-3) and a fourth through hole (4-4), the first through hole (4-1), the third through hole (4-3), the fourth through hole (4-4) and the second through hole (4-2) are sequentially arranged from one side end face to the other side end face of the test block body (1), the radial included angle between the plane where the axes of the first through hole (4-1) and the third through hole (4-3) are located and the test block body (1) is not smaller than the incident angle of ultrasonic waves, and the radial included angle between the plane where the axes of the fourth through hole (4-4) and the second through hole (4-2) are located and the test block body (1) is not smaller than the incident angle of ultrasonic waves.
6. The test block of the contrast reflector for the multi-reflection flaw detection of the defects in the middle of the welding line of the building net rack according to claim 5, wherein the distance L2 between the intersection point of the plane where the axes of the first through hole (4-1) and the third through hole (4-3) are located and the intrados (2) of the test block body (1) and the intersection point of the plane where the axes of the fourth through hole (4-4) and the second through hole (4-2) are located and the intrados (2) of the test block body (1) is not less than 3h x tan alpha, wherein h is the wall thickness of the test block body (1), and alpha is the incident angle of ultrasonic waves.
7. The test block of the contrast reflector for the multi-reflection flaw detection of the middle defect of the welding line of the building grid frame according to claim 5, wherein the distance between the axis of the first through hole (4-1) and the top of the extrados (3) of the test block body (1) is 3mm, the distance between the axis of the second through hole (4-2) and the top of the extrados (3) of the test block body (1) is 8mm, the distance between the axis of the third through hole (4-3) and the top of the extrados (3) of the test block body (1) is 13mm, the distance between the axis of the fourth through hole (4-4) and the top of the extrados (3) of the test block body (1) is 18mm, and the distance between the axis of the fourth through hole (4-4) and the top of the intrados (2) of the test block body (1) is 5 mm.
8. The test block of the contrast reflector for the multi-reflection flaw detection of the defects in the middle of the welding seam of the building grid frame according to the claim 5, wherein the radius R1 of the extrados (3) of the test block body (1), the radius R2 of the intrados (2) and the wall thickness h satisfy the following relation:
R2＝R1-h。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021870656.6U CN212932506U (en) | 2020-08-31 | 2020-08-31 | Contrast reflector test block for flaw detection of middle part of welding seam of building net rack by multiple reflection method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021870656.6U CN212932506U (en) | 2020-08-31 | 2020-08-31 | Contrast reflector test block for flaw detection of middle part of welding seam of building net rack by multiple reflection method |
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| CN212932506U true CN212932506U (en) | 2021-04-09 |
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| CN202021870656.6U Expired - Fee Related CN212932506U (en) | 2020-08-31 | 2020-08-31 | Contrast reflector test block for flaw detection of middle part of welding seam of building net rack by multiple reflection method |
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| CN (1) | CN212932506U (en) |
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- 2020-08-31 CN CN202021870656.6U patent/CN212932506U/en not_active Expired - Fee Related
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Granted publication date: 20210409 |