Some standard content:
YB/T951—2003
This standard selects the European standard P-EN357 heavy rail for expressway, part 1, requirements for ultrasonic damage of rails with symmetrical pin resistance of 4ekg/m and above. This standard replaces YB/T951 and 19Rt rails to avoid ultrasonic damage. Compared with Y/1-1981, this standard has the following main changes: - The scope of application of the standard has been expanded from only applicable to 43kg/m and 50kg/m to applicable to 37kg/m and 75kg/m saws; - Definitions have been added; - Requirements for flaw detectors have been added; - The requirements for flaw detection speed have been cancelled; - The requirements for flaw detection based on the 50/50000 standard have been revised to meet the requirements of the FN standard for artificial defects; - Special comparison test blocks have been added. - Appendix A of this standard is a normative appendix.
This standard was proposed by the China Copper Industry Association and was formed by the National Steel Standardization Technical Committee. The drafting unit of this standard: Bangxiaohua Iron and Steel Co., Ltd. The main drafters of this standard: Li Changhui, Yang Zhongwei, Zui Gong, He Xiaozhi, Huo Shang This standard was first issued in 1981.
Ultrasonic flaw detection method for rails
YB/T951—2003
This standard specifies the terms and definitions, personnel requirements, flaw detection principles, flaw detection methods, operation requirements, test methods, probes, instrument equipment, signal ratio, process quality, operation, result judgment and marking of ultrasonic flaw detection for steel. This standard is applicable to ultrasonic flaw detection of 3?kg/m~75kg/m rails, and other steel rails can be implemented by signing.
2 Normative reference documents
The clauses in the following documents are generally The provisions of this standard shall be used in accordance with the provisions of this standard. All referenced test pieces with a specified period of time and all subsequent changes (excluding errors or errors) are not applicable to this standard. However, the parties to this standard shall study whether the recommended versions of these pieces can be used. The latest versions shall be used for this standard. (E2555 Hot-rolled steel for iron ore
GB/T1125S Preparation and inspection method of steel comparison test blocks for ultrasonic testing (ASTM E42B) GB/T12601,1 Non-testing terminology Ultrasonic testing J/T10061 Type A skin reflection ultrasonic wave general equipment B/T1062 Ultrasonic detection test method 3 Technical understanding and definition
B\T1604. The following terms and definitions are applicable to this standard. 3. 1
Bottom center and all base
Rail surface frequency to any point on the pulse axis, 3.2
Current carbonization ktahility
Saw new operation process, medical or forbidden degree of Li chemical flow. 3.3wwW.bzxz.Net
Stabilitybidlces
Qualitative index
Practice change, give you a qualitative limit. 3.4
Benchmark horizontal flow height range bencbnvarik echo heightH) judge the relative commercial degree of the test height: use the percentage of full cap to install forever, the range of benchmark echo height H: 50%~80% of full cap.
Effective disk correction value meiriedvalukuf Sensitivity special comparison block and static sample block, dynamic set sample heat return, solid quality, surface condition caused by the difference in tearing load, 3.6
Special comparison test block specilcomparativeteatplece is made according to the method specified in G code 1259 and the test block made according to the artificial defects specified in the technical conditions of the manual. 3.7
Static sample static 5nplece
YB/T951—2003
Use a test block made of a pin rail with a length of not less than 100mm and a shape that is the same as the position of the rail before the flaw detection and the test position, and a test block made according to the specified artificial defects, 3,8
Dynamic sample heat dyamiesample rail
Use a rail with a length of not less than 6 meters and no defects above the reporting level, and a sample made according to the specified equivalent artificial defects. 4. Detection principle
The mutual conversion between visible energy and ultrasonic energy and the physical properties of ultrasonic waves in elastic media are the basic principles of steel anti-wave operation. The ultrasonic beam emitted by a certain question propagates in the steel, and after being processed by the value of the flaw detector, a flaw or a flaw indication is given.
5 Detection method
5.1 The impulse and emission method is adopted, and the automatic test is carried out when the probe and the detector are in motion. 5.2 When inspecting, water is selected as a medium with good acoustic permeability and no damage to the steel surface. 6 Personnel requirements
6.1 The personnel who work on the flaw detection should hold the ultrasonic wave detection technical qualification certificate issued by the legal department. 5.2 The personnel who issue the flaw detection report should hold the flaw detection technical qualification certificate of level 1 or above issued by the legal department. 6.3 The flaw detection personnel should have good overall quality to adapt to the work, and their performance should not be less than 0. The performance should be checked once a year. 7 Flaw detection requirements
7.1 The flaw detection requirements of the rail should comply with the provisions of CB2593 standard. 7.2 The length of the rail that cannot be flawed should be less than the processing quantity, and meet the requirements of the full length of the product rail. 7.3 When ultrasonic testing the rail, a dynamic sample rail should be available, and the artificial sinking and position of the rail head, rail feel, rail back are shown in Figure 1, Figure 2, and Figure 3 respectively. Other artificial sinking calibrations can also be used, but the flaw detection sensitivity should be guaranteed to be the same. The unit is whole
n; ? kg/m~.c3 5g/m
.Ren 2mm
) 5c kg/m.--75 ka/m
Note, strict bottom hole:
2) hole depth 15mm
3>In the allowed level of 10,
Figure 1 Artificial defects and positions of steel pad rail head
) 37 hg/11~43 kg/m
Parts, flat warehouse hole:
) 2mm light station to vehicle distance center war
2) Combined with the horizontal grade soil 10' before,
YB/T 951-2003
The unit is required meter
b) 50 kg/m-75 kg/m
Figure 2 Artificial defects and position measurement of rail bottom
Unit: meter
Hole spacing mm
8) 37 kg/m:.~75 kg/m
8 Test block
8.1 Special comparison test block
b> 55 kg'm ~75 kg/m
Figure 3 Artificial defects and position measurement of rail bottom
Should be made by the unit with strong manufacturing standard test blocks or measuring instruments. 1.1 Function
Use the card test to calibrate the sensitivity. 1.2 Requirements
1.2.1 The test clamp is made of 45 steel and should be checked according to the example. The angle is 1. mm×45. The error of the artificial defect in the same test is greater than 1 8.1,2.2 Except as provided in this standard, the following shall comply with the requirements of 3/111259. 8.1.3 Type and size 8.1.3.1 The size of the rail head special comparison test block shall comply with the provisions of Figure 1 and Table 1. 8.1.3.2 The size of the rail head special comparison test block shall comply with the provisions of Figure 5 and Table 2. YB/T 95t—2003 37kg/m7uhg/m 60 kg/m~.T5 kg/m Figure 4 Dimensions of thermal head comparison test block Table 1 Dimensions of thermal head special comparison test block ke/u
37kr/m~.75kg/m
Group 5 Rail waist inspection comparison test block size
Unit is required
Unit is general
Unit is meter
50 kg/m--75 kg/m
Medium meter
8. 1. 3. 3
37 kgam
Special comparison test block size for rail waist
3gkg/m
43kg/m
Special comparison test block size for rail waist should be determined according to Figure 5 and Table 1
50kg/m
Special comparison test block size for rail depot
3? kg/:
83 kg/rn
:11,5
As kg/
) a? kg/nt
h) 38 kg'n
r) 43 kg/m
Figure 6 Dimensions of special comparison test block for rail bottom
sc kg/m
YH/T 8512003
for pulling meter
TE sA/0
position for meaning meter
?kp'cu
for male
YB/T 9512003
8.2 Comparison test block
8.2.1 Static sample block
8.2. 1. 1 Function
H) ao kg/m--75 kg/m
6A diameter 2mm
ei Su kgrut--?u bp/cu
Figure 6 (continued)
100±1
100±1
Degree is the detection standard of steel quality. Determination sensitivity correction value. Test the working performance of the instrument and the probe under the condition that the probe and the static sample are relatively static, and calibrate the artificial defect equivalent of the dynamic sample. 8.2.1.2 Requirements
8.2.1.2.1 Rail waist length is not less than 10 mm and rail length is not less than 125 mm.8.2.1.2.2 Defect positions are shown in Figures 7, 8, 9 and 4. 8.2.1.2.3 Artificial defect sizes of head, waist and end are shown in Figures 1 and 2.8.2.2 Dynamic sample rail
8.2.2.1 Function
Adjust the landing gear under the condition that the probe and the dynamic sample rail are relatively static, and adjust the sensitivity under the condition that the probe and the dynamic sample rail are relatively moving. Detect the stability of the running structure under the condition that the probe guides the dynamic standard relative movement. 8.2.2.2 Requirements
8.2.2.2.1 Length not less than 5m
8.2.2.7.2 Defect location See Figure 10 and Table 4 for the appropriate sensitivity. 8.2.2.2.3 Defect size of rail head, rail bottom 1 Defect size Figure: 2, Figure 3, 8.2.2.2.4 In addition to the standard heat setting, the other should meet the requirements of food (H/T1125, 8.3 Sealing of test block
Proof of artificial defects in the defect also use the tree tire from Dan G
Figure 7 Static sample size of the head
Figure 8 Static sample size of the waist
100±」
General m
Figure 9 Static sample size of the bottom
YB/T951- -2003
Unit price mm
Unit meter
Unit meter
YB/T951—2003
B.4 Test calibration
Special calibration method GB/T1125 standard, static sample and dynamic sample every 2 years with special comparison test block calibration sensitivity fast stop value.
9 Manipulator
Manipulator performance and test type selection storage period C light standard implementation and recording regulations probe number and arrangement seat thank full The requirements of this standard shall be met. 9.2
9.3 The probe and the instrument shall be connected with a small and well-matched cable. 10.1 The ultrasonic flaw detector shall be a batch type or a condenser type. Its technical requirements shall comply with the provisions of /T10061. 10.2 The alarm door system shall be used. The alarm door is located at the beginning of the cover, and the width and alarm depth are adjustable. The alarm door displacement shall not exceed the equivalent sound path of 1 cut. 10.3 The frequency of the instrument is the requirement of the auxiliary equipment. The detection rate is mainly calculated as follows:
Where:
F——change rate, 1/5 of the position
selection rate, single meter per mm/s
chip width, unit is (m).
Table 4 Comparison of test block artificial defects size
Through hole light
Clean hole depth
Flat hole height in
Through five, text diameter
Letter ratio
37 sg/m
Good throw protection
43kg/m
5℃kgm
32/43/52
60 kg/m
23,39-45
59/870
Unit is
15*g/m
23/37/42
152/82/72
More details The number of pieces at the effective center and the more energy center is not less than 12B
12 stability
Under the condition of the flaw detection, the wave is not greater than 3,13
YB/T951—2Q03
13.1 Echo height adjustment: The measured accuracy should be within the reference height range: 13.2M Accuracy sensitivity measurement: Under the positive detection accuracy, the echoes of artificial defects on the dynamic sample track are adjusted to be in alarm state. 13.3 Stability adjustment: Use the dynamic sample to go back and forth several times, and the stability meets the requirements. 13.4 Detection sensitivity adjustment: Read the sensitivity according to the correction value of the dynamic sample and the static sample. 13.5 Batch gate adjustment: the two dynamic rail gates shall also meet the requirements of surface detection and continuous inspection. The noise within the gate range shall be lower than 12 adjustment values.
13.6 Frequency flaw detection, after the above-mentioned acoustic wave test adjustment, the flaw detection operation shall be carried out. 14 Result judgment and notes
14.1 Result judgment: The rails with defective reflection exceeding 2F from the flat bottom hole shall be used as the judgement rails, and the judged rails shall be unqualified or the defective parts shall be removed.
Single for parent
8) 37 kR/~-23 4g/m
Note, the 5nn in the net is for testing
b) E5 k/m~.75 kg/m
Figure 10 Dynamic sample pad size
YB/T 951--2003
Marking The qualified products of flaw detection must be marked. 14.2
14.3 Record.
4.3.1 The unqualified products of flaw detection must have the detection record, 14.3.2 The sensitivity correction value must be recorded. 14.4 NDT report
14.4.1 The qualified steel shall be issued with a NDT report. 2. Main contents of the NDT report: date, group number, NDT conditions, certificate, personnel location, etc. 14.4.2
A.1 Rail head NDT probe
Appendix A
(Normative Appendix
Probe performance and test
YB/T951—2003
4.1.1 Characteristic curve: Use Figure A, 1 test block, determine its screening quotient () at each thickness, and make a distance-to-resistance () curve. The characteristic curve must meet the following requirements:
At.1.1 The difference between the playback height and the measured wave height at 10mr from the upper and lower surfaces Should be within 6dB. A.1.2 Effective beam width: 1 mm flat bottom hole. Move the probe halfway along the surface of the probe, 6dB to measure the beam width, the unit is meter. Figure A.1 Rail head ultrasonic test block. A.2 Rail ink probe. 2.1 Use Figure A.2 test block, measure the echo height (dB) at each thickness, and make a distance amplitude (4 months curve. The characteristic curve must meet the following conditions: A.2.1.1 The difference between the echo quotient and the maximum echo height at 4nr from the upper and lower surfaces should be within 3dB, the unit is meter. Figure A.2 Rail head ultrasonic test blockThe length of the rail waist shall not be less than 10 mm. The rail energy efficiency shall not be less than 125 mm. 8.2.1.2.2 The defect location is shown in Figures 7, 8, 9 and 4. 8.2.1.2.3 The size of the head, waist and mature artificial defects is shown in Figures 1 and 2. Figure 3. 8.2.2 Dynamic sample rail
8.2.2.1 Function
Adjust the landing gear when the probe and the dynamic sample rail are in a static state, and adjust the sensitivity when the probe and the dynamic sample rail are in relative motion. Detect the stability of the running structure under the relative motion of the probe. 8.2.2.2 Requirements
8.2.2.2.1 The length is not less than 5 m
8.2.2.7.2 The defect location is shown in Figure 10 and Table 4. Reduce the corresponding sensitivity. 8.2.2.2.3 The size of defects of rail head and rail bottom shall be as shown in Figure 1, Figure 2, Figure 3, 8.2.2.2.4 In addition to the standard heat setting, the other requirements shall comply with those of H/T1125. 8.3 The sealing of the test block shall be as shown in Figure 7. The size of static sample block for the head shall be as shown in Figure 8. The size of static sample block for the rail waist shall be as shown in Figure 9. The size of static sample block for the bottom shall be as shown in Figure 9. -2003
Unit price mm
Unit meter
Unit meter
YB/T951—2003
B.4 Test calibration
Special calibration method GB/T1125 standard, static sample and dynamic sample every 2 years with special comparison test block calibration sensitivity fast stop value.
9 Manipulator
Manipulator performance and test type selection storage period C light standard implementation and recording regulations probe number and arrangement seat thank full The requirements of this standard shall be met. 9.2
9.3 The probe and the instrument shall be connected with a small and well-matched cable. 10.1 The ultrasonic flaw detector shall be a batch type or a condenser type. Its technical requirements shall comply with the provisions of /T10061. 10.2 The alarm door system shall be used. The alarm door is located at the beginning of the cover, and the width and alarm depth are adjustable. The alarm door displacement shall not exceed the equivalent sound path of 1 cut. 10.3 The frequency of the instrument is the requirement of the auxiliary equipment. The detection rate is mainly calculated as follows:
Where:
F——change rate, 1/5 of the position
selection rate, single meter per mm/s
chip width, unit is (m).
Table 4 Comparison of test block artificial defects size
Through hole light
Clean hole depth
Flat hole height in
Through five, text diameter
Letter ratio
37 sg/m
Good throw protection
43kg/m
5℃kgm
32/43/52
60 kg/m
23,39-45
59/870
Unit is
15*g/m
23/37/42
152/82/72
More details The number of pieces at the effective center and the more energy center is not less than 12B
12 stability
Under the condition of the flaw detection, the wave is not greater than 3,13
YB/T951—2Q03
13.1 Echo height adjustment: The measured accuracy should be within the reference height range: 13.2M Accuracy sensitivity measurement: Under the positive detection accuracy, the echoes of artificial defects on the dynamic sample track are adjusted to be in alarm state. 13.3 Stability adjustment: Use the dynamic sample to go back and forth several times, and the stability meets the requirements. 13.4 Detection sensitivity adjustment: Read the sensitivity according to the correction value of the dynamic sample and the static sample. 13.5 Batch gate adjustment: the two dynamic rail gates shall also meet the requirements of surface detection and continuous inspection. The noise within the gate range shall be lower than 12 adjustment values.
13.6 Frequency flaw detection, after the above-mentioned acoustic wave test adjustment, the flaw detection operation shall be carried out. 14 Result judgment and notes
14.1 Result judgment: The rails with defective reflection exceeding 2F from the flat bottom hole shall be used as the judgement rails, and the judged rails shall be unqualified or the defective parts shall be removed.
Single for parent
8) 37 kR/~-23 4g/m
Note, 5nn in the net is for testing
b) E5 k/m~.75 kg/m
Figure 10 Dynamic sample pad size
YB/T 951--2003
Marking The qualified products of flaw detection must be marked. 14.2
14.3 Record.
4.3.1 The unqualified products of flaw detection must have the detection record, 14.3.2 The sensitivity correction value must be recorded. 14.4 NDT report
14.4.1 The qualified steel shall be issued with a NDT report. 2. Main contents of the NDT report: date, group number, NDT conditions, certificate, personnel location, etc. 14.4.2
A.1 Rail head NDT probe
Appendix A
(Normative Appendix
Probe performance and test
YB/T951—2003
4.1.1 Characteristic curve: Use Figure A, 1 test block, determine its screening quotient () at each thickness, and make a distance-to-resistance () curve. The characteristic curve must meet the following requirements:
At.1.1 The difference between the playback height and the measured wave height at 10mr from the upper and lower surfaces Should be within 6dB. A.1.2 Effective beam width: 1 mm flat bottom hole. Move the probe halfway along the surface of the probe, 6dB to measure the beam width, the unit is meter. Figure A.1 Rail head ultrasonic test block. A.2 Rail ink probe. 2.1 Use Figure A.2 test block, measure the echo height (dB) at each thickness, and make a distance amplitude (4 months curve. The characteristic curve must meet the following conditions: A.2.1.1 The difference between the echo quotient and the maximum echo height at 4nr from the upper and lower surfaces should be within 3dB, the unit is meter. Figure A.2 Rail head ultrasonic test blockThe length of the rail waist shall not be less than 10 mm. The rail energy efficiency shall not be less than 125 mm. 8.2.1.2.2 The defect location is shown in Figures 7, 8, 9 and 4. 8.2.1.2.3 The size of the head, waist and mature artificial defects is shown in Figures 1 and 2. Figure 3. 8.2.2 Dynamic sample rail
8.2.2.1 Function
Adjust the landing gear when the probe and the dynamic sample rail are in a static state, and adjust the sensitivity when the probe and the dynamic sample rail are in relative motion. Detect the stability of the running structure under the relative motion of the probe. 8.2.2.2 Requirements
8.2.2.2.1 The length is not less than 5 m
8.2.2.7.2 The defect location is shown in Figure 10 and Table 4. Reduce the corresponding sensitivity. 8.2.2.2.3 The size of defects of rail head and rail bottom shall be as shown in Figure 1, Figure 2, Figure 3, 8.2.2.2.4 In addition to the standard heat setting, the other requirements shall comply with those of H/T1125. 8.3 The sealing of the test block shall be as shown in Figure 7. The size of static sample block for the head shall be as shown in Figure 8. The size of static sample block for the rail waist shall be as shown in Figure 9. The size of static sample block for the bottom shall be as shown in Figure 9. -2003
Unit price mm
Unit meter
Unit meter
YB/T951—2003
B.4 Test calibration
Special calibration method GB/T1125 standard, static sample and dynamic sample every 2 years with special comparison test block calibration sensitivity fast stop value.
9 Manipulator
Manipulator performance and test type selection storage period C light standard implementation and recording regulations probe number and arrangement seat thank full The requirements of this standard shall be met. 9.2
9.3 The probe and the instrument shall be connected with a small and well-matched cable. 10.1 The ultrasonic flaw detector shall be a batch type or a condenser type. Its technical requirements shall comply with the provisions of /T10061. 10.2 The alarm door system shall be used. The alarm door is located at the beginning of the cover, and the width and alarm depth are adjustable. The alarm door displacement shall not exceed the equivalent sound path of 1 cut. 10.3 The frequency of the instrument is the requirement of the auxiliary equipment. The detection rate is mainly calculated as follows:
Where:
F——change rate, 1/5 of the position
selection rate, single meter per mm/s
chip width, unit is (m).
Table 4 Comparison of test block artificial defects size
Through hole light
Clean hole depth
Flat hole height in
Through five, text diameter
Letter ratio
37 sg/m
Good throw protection
43kg/m
5℃kgm
32/43/52
60 kg/m
23,39-45
59/870
Unit is
15*g/m
23/37/42
152/82/72
More details The number of pieces at the effective center and the more energy center is not less than 12B
12 stability
Under the condition of the flaw detection, the wave is not greater than 3,13
YB/T951—2Q03
13.1 Echo height adjustment: The measured accuracy should be within the reference height range: 13.2M Accuracy sensitivity measurement: Under the positive detection accuracy, the echoes of artificial defects on the dynamic sample track are adjusted to be in alarm state. 13.3 Stability adjustment: Use the dynamic sample to go back and forth several times, and the stability meets the requirements. 13.4 Detection sensitivity adjustment: Read the sensitivity according to the correction value of the dynamic sample and the static sample. 13.5 Batch gate adjustment: the two dynamic rail gates shall also meet the requirements of surface detection and continuous inspection. The noise within the gate range shall be lower than 12 adjustment values.
13.6 Frequency flaw detection, after the above-mentioned acoustic wave test adjustment, the flaw detection operation shall be carried out. 14 Result judgment and notes
14.1 Result judgment: The rails with defective reflection exceeding 2F from the flat bottom hole shall be used as the judgement rails, and the judged rails shall be unqualified or the defective parts shall be removed.
Single for parent
8) 37 kR/~-23 4g/m
Note, the 5nn in the net is for testing
b) E5 k/m~.75 kg/m
Figure 10 Dynamic sample pad size
YB/T 951--2003
Marking The qualified products of flaw detection must be marked. 14.2
14.3 Record.
4.3.1 The unqualified products of flaw detection must have the detection record, 14.3.2 The sensitivity correction value must be recorded. 14.4 NDT report
14.4.1 The qualified steel shall be issued with a NDT report. 2. Main contents of the NDT report: date, group number, NDT conditions, certificate, personnel location, etc. 14.4.2
A.1 Rail head NDT probe
Appendix A
(Normative Appendix
Probe performance and test
YB/T951—2003
4.1.1 Characteristic curve: Use Figure A, 1 test block, determine its screening quotient () at each thickness, and make a distance-to-resistance () curve. The characteristic curve must meet the following requirements:
At.1.1 The difference between the playback height and the measured wave height at 10mr from the upper and lower surfaces Should be within 6dB. A.1.2 Effective beam width: 1 mm flat bottom hole. Move the probe halfway along the surface of the probe, 6dB to measure the beam width, the unit is meter. Figure A.1 Rail head ultrasonic test block. A.2 Rail ink probe. 2.1 Use Figure A.2 test block, measure the echo height (dB) at each thickness, and make a distance amplitude (4 months curve. The characteristic curve must meet the following conditions: A.2.1.1 The difference between the echo quotient and the maximum echo height at 4nr from the upper and lower surfaces should be within 3dB, the unit is meter. Figure A.2 Rail head ultrasonic test block3 The frequency of the instrument is fast and the requirements of the auxiliary equipment are met. The detection rate is mainly calculated as follows:
Where:
F——change rate, 1/5 of each
selection rate, single meter per mm/s
chip width, unit is side (m).
Table 4 Comparison of test block artificial defects size
Through hole light
Clean hole depth
Flat hole height in
Through five, text diameter
Letter ratio
37 sg/m
Good throw protection
43kg/m
5℃kgm
32/43/52
60 kg/m
23,39-45
59/870
Unit is
15*g/m
23/37/42
152/82/72
More details The number of pieces at the effective center and the more energy center is not less than 12B
12 stability
Under the condition of the flaw detection, the wave is not greater than 3,13
YB/T951—2Q03
13.1 Echo height adjustment: The measured accuracy should be within the reference height range: 13.2M Accuracy sensitivity measurement: Under the positive detection accuracy, the echoes of artificial defects on the dynamic sample track are adjusted to be in alarm state. 13.3 Stability adjustment: Use the dynamic sample to go back and forth several times, and the stability meets the requirements. 13.4 Detection sensitivity adjustment: Read the sensitivity according to the correction value of the dynamic sample and the static sample. 13.5 Batch gate adjustment: the two dynamic rail gates shall also meet the requirements of surface detection and continuous inspection. The noise within the gate range shall be lower than 12 adjustment values.
13.6 Frequency flaw detection, after the above-mentioned acoustic wave test adjustment, the flaw detection operation shall be carried out. 14 Result judgment and notes
14.1 Result judgment: The rails with defective reflection exceeding 2F from the flat bottom hole shall be used as the judgement rails, and the judged rails shall be unqualified or the defective parts shall be removed.
Single for parent
8) 37 kR/~-23 4g/m
Note, the 5nn in the net is for testing
b) E5 k/m~.75 kg/m
Figure 10 Dynamic sample pad size
YB/T 951--2003
Marking The qualified products of flaw detection must be marked. 14.2
14.3 Record.
4.3.1 The unqualified products of flaw detection must have the detection record, 14.3.2 The sensitivity correction value must be recorded. 14.4 NDT report
14.4.1 The qualified steel shall be issued with a NDT report. 2. Main contents of the NDT report: date, group number, NDT conditions, certificate, personnel location, etc. 14.4.2
A.1 Rail head NDT probe
Appendix A
(Normative Appendix
Probe performance and test
YB/T951—2003
4.1.1 Characteristic curve: Use Figure A, 1 test block, determine its screening quotient () at each thickness, and make a distance-to-resistance () curve. The characteristic curve must meet the following requirements:
At.1.1 The difference between the playback height and the measured wave height at 10mr from the upper and lower surfaces Should be within 6dB. A.1.2 Effective beam width: 1 mm flat bottom hole. Move the probe halfway along the surface of the probe, 6dB to measure the beam width, the unit is meter. Figure A.1 Rail head ultrasonic test block. A.2 Rail ink probe. 2.1 Use Figure A.2 test block, measure the echo height (dB) at each thickness, and make a distance amplitude (4 months curve. The characteristic curve must meet the following conditions: A.2.1.1 The difference between the echo quotient and the maximum echo height at 4nr from the upper and lower surfaces should be within 3dB, the unit is meter. Figure A.2 Rail head ultrasonic test block3 The frequency of the instrument is fast and the requirements of the auxiliary equipment are met. The detection rate is mainly calculated as follows:
Where:
F——change rate, 1/5 of each
selection rate, single meter per mm/s
chip width, unit is side (m).
Table 4 Comparison of test block artificial defects size
Through hole light
Clean hole depth
Flat hole height in
Through five, text diameter
Letter ratio
37 sg/m
Good throw protection
43kg/m
5℃kgm
32/43/52
60 kg/m
23,39-45
59/870
Unit is
15*g/m
23/37/42
152/82/72
More details The number of pieces at the effective center and the more energy center is not less than 12B
12 stability
Under the condition of the flaw detection, the wave is not greater than 3,13
YB/T951—2Q03
13.1 Echo height adjustment: The measured accuracy should be within the reference height range: 13.2M Accuracy sensitivity measurement: Under the positive detection accuracy, the echoes of artificial defects on the dynamic sample track are adjusted to be in alarm state. 13.3 Stability adjustment: Use the dynamic sample to go back and forth several times, and the stability meets the requirements. 13.4 Detection sensitivity adjustment: Read the sensitivity according to the correction value of the dynamic sample and the static sample. 13.5 Batch gate adjustment: the two dynamic rail gates shall also meet the requirements of surface detection and continuous inspection. The noise within the gate range shall be lower than 12 adjustment values.
13.6 Frequency flaw detection, after the above-mentioned acoustic wave test adjustment, the flaw detection operation shall be carried out. 14 Result judgment and notes
14.1 Result judgment: The rails with defective reflection exceeding 2F from the flat bottom hole shall be used as the judgement rails, and the judged rails shall be unqualified or the defective parts shall be removed.
Single for parent
8) 37 kR/~-23 4g/m
Note, the 5nn in the net is for testing
b) E5 k/m~.75 kg/m
Figure 10 Dynamic sample pad size
YB/T 951--2003
Marking The qualified products of flaw detection must be marked. 14.2
14.3 Record.
4.3.1 The unqualified products of flaw detection must have the detection record, 14.3.2 The sensitivity correction value must be recorded. 14.4 NDT report
14.4.1 The qualified steel shall be issued with a NDT report. 2. Main contents of the NDT report: date, group number, NDT conditions, certificate, personnel location, etc. 14.4.2
A.1 Rail head NDT probe
Appendix A
(Normative Appendix
Probe performance and test
YB/T951—2003
4.1.1 Characteristic curve: Use Figure A, 1 test block, determine its screening quotient () at each thickness, and make a distance-to-resistance () curve. The characteristic curve must meet the following requirements:
At.1.1 The difference between the playback height and the measured wave height at 10mr from the upper and lower surfaces Should be within 6dB. A.1.2 Effective beam width: 1 mm flat bottom hole. Move the probe halfway along the surface of the probe, 6dB to measure the beam width, the unit is meter. Figure A.1 Rail head ultrasonic test block. A.2 Rail ink probe. 2.1 Use Figure A.2 test block, measure the echo height (dB) at each thickness, and make a distance amplitude (4 months curve. The characteristic curve must meet the following conditions: A.2.1.1 The difference between the echo quotient and the maximum echo height at 4nr from the upper and lower surfaces should be within 3dB, the unit is meter. Figure A.2 Rail head ultrasonic test block
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