TB/T Translated English of Chinese Standard: TB/T RAILWAY INDUSTRY STANDARD

Transcription

1 Translated English of Chinese Standard: TB/T RAILWAY INDUSTRY STANDARD TB OF THE PEOPLE S REPUBLIC OF CHINA TB/T eqv ISO 5948:1994 Ultrasonic inspection of rolling stock axles 机车车辆车轴超声波检验 Issued on: May 28, 2001 Implemented on: December 01, 2001 Issued by: Ministry of Railways of People s Republic of China Page 1 of 15

2 Table of contents Foreword... 3 lso introduction Scope Normative references Personnel requirements Instrument, probe and coupling agent Test block and curves Preparation of Radial testing distance - amplitude curve Testing conditions Axial acoustic transmission testing sensitivity Axial testing sensitivity Radial testing sensitivity Acceptance... 8 Appendix A (Normative) TS-1 test block Appendix B (Normative) TS-1W test block Appendix C (Normative) TS-2 test block schematics Appendix D (Normative) Axial defect testing distance amplitude curve Appendix E (Normative) Radial defect testing distance - amplitude curve schematics Page 2 of 15

3 Foreword The relevant rolling stock axle ultrasonic test method in this Standard is equivalent to the method specified in ISO Railway rolling stock material-ultrasonic acceptance testing. From the date of implementation of this Standard, it shall replace TB Ultrasonic inspection of rolling stock axles. The Appendix A, Appendix B, Appendix C, Appendix D and Appendix E of standard are normative. This Standard was proposed by the Ministry of Railways Qishuyan Locomotive & Rolling Stock Technology Research Institute. This Standard shall be under the jurisdiction of the Ministry of Railways Qishuyan Locomotive & Rolling Stock Technology Research Institute. The drafting organizations of this Standard: Ministry of Railways Qishuyan Locomotive & Rolling Stock Technology Research Institute, China Academy of Railway Sciences Metals and Chemistry Research Institute. Main drafters of this Standard: Huang Yongwei, Li Lianxiu, Lu Xuanguo, Yao Rongwen. This Standard was first-time issued on December 14, This Standard was first-time revised in May Page 3 of 15

4 RAILWAY INDUSTRY STANDARD OF THE PEOPLE S REPUBLIC OF CHINA TB/T eqv ISO 5948:1994 Ultrasonic inspection of rolling stock axles 1 Scope This Standard specifies the newly made railway rolling stock axle s ultrasonic inspection method AND acceptance specifications. This Standard applies to the testing of newly made axle material s overall performance AND internal defects. 2 Normative references The provisions in following documents become the provisions of this Standard through reference in this Standard. At the time of publication of this Standard, the editions indicated were valid. All standards are subject to revision, however, parties who use this Standard are encouraged to study if the latest versions of these documents are applicable. JB/T Commonly used specification for A-mode ultrasonic defect detector using pulse echo technique JB/T Testing methods for performance of probes used in ultrasonic defect testing GB/T General tolerances Tolerances for linear and angular dimensions without individual tolerance indications 3 Personnel requirements 3.1 The personnel who undertake axle ultrasonic testing must acquire appropriate basic knowledge, AND be familiar with the provisions of this Standard. 3.2 The testing personnel must obtain the grade II and above NDT technical qualification certificate which is issued by the Ministry of Railway NDT Page 5 of 15

5 personnel technical qualification assessment commission. 4 Instrument, probe and coupling agent 4.1 The ultrasonic defect detector shall comply with the requirements of JB/T Ultrasonic probe Probe type: 2.5P20Z longitudinal wave straight probes Main beam deviation: the included angle between the probe s main beam AND the probe s normal shall not be more than 1 o The sound pressure distribution of the probe sound field shall not have obvious double peaks As for the other performance indicators and test methods of probe, it shall comply with the requirements of JB/T Coupling agent: engine oil, glycerine or water. 5 Test block and curves 5.1 As for TS-1 test block, see Appendix A. 5.2 As for TS-1W test block, see Appendix B. 5.3 As for TS-2 test block schematics, see Appendix C. 5.4 As for axial defect testing distance - amplitude curve schematics, see Appendix D. 5.5 As for radial defect testing distance - amplitude curve schematics, see Appendix E. 6 Preparation of Radial testing distance - amplitude curve 6.1 Radial testing distance the amplitude curve is prepared by the testing personnel based on the testing system used. Before use, it shall calibrate this curve. Page 6 of 15

6 PLACE the straight probe onto the TS-2 test block s journal; ADJUST the instrument, to make the echo height of No.1 flat bottom hole equal to 50% of the full vertical scale; COMPENSATE the coupling difference between the test block and real axle; GAIN another 4 db, which is the testing sensitivity Wheel seat PLACE the straight probe onto the TS-2 test block s wheel seat; ADJUST the instrument, to make the echo height of No.4 flat bottom hole equal to 50% of the full vertical scale; COMPENSATE the coupling difference between the test block and real axle; GAIN another 4 db, which is the testing sensitivity Axle body PLACE the straight probe onto the TS-2 test block s axle body; ADJUST the instrument, to make the echo height of No.7 flat bottom hole equal to 50% of the full vertical scale; COMPENSATE the coupling difference between the test block and real axle; GAIN another 4 db, which is the testing sensitivity Bottom echo attenuation PLACE the straight probe onto the TS-2 test block s axle body; MAKE the echo height of the axle body bottom at No.10 taper hole equal to 50% of the full vertical scale; COMPENSATE the coupling difference between the test block and real axle, which is the testing sensitivity by bottom echo height attenuation method. 11 Acceptance 11.1 Axial acoustic transmission Acceptance region: within the axle end face center to 1/2R area, AND the region boundary is based on the probe center Within the acceptance region, if the bottom echo height equals to or higher than the reference wave height, it is deemed as qualified Within the acceptance region, if the bottom echo height is lower than the reference wave height, the total area does not exceed 1/16 of the acceptance region, AND the amplitude decrease is not less than 1/2 of the reference wave height, it is also deemed as qualified If it fails to meet the requirements of Clause and , it is deemed as disqualified. Page 8 of 15