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GB/T 39242-2020: Non-destructive testing. Ultrasonic testing. Sensitivity and range setting
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Non-destructive testing. Ultrasonic testing. Sensitivity and range setting
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GB/T 39242-2020
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Basic data | Standard ID | GB/T 39242-2020 (GB/T39242-2020) | | Description (Translated English) | Non-destructive testing. Ultrasonic testing. Sensitivity and range setting | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | J04 | | Classification of International Standard | 19.100 | | Word Count Estimation | 37,379 | | Date of Issue | 2020-11-19 | | Date of Implementation | 2021-06-01 | | Quoted Standard | GB/T 19799.1; GB/T 19799.2; EN 12668-3 | | Adopted Standard | ISO 16811-2012, MOD | | Regulation (derived from) | National Standard Announcement No. 26 of 2020 | | Issuing agency(ies) | State Administration for Market Regulation, China National Standardization Administration | | Summary | This standard specifies the general rules for setting the baseline range and sensitivity (such as gain adjustment) when using an A-scan ultrasonic detector for manual testing, to ensure that the reflector position and echo height can be measured repeatedly. This standard applies to single crystal or double crystal single probe contact technology, and does not apply to liquid immersion technology and multi-probe technology. | GB/T 39242-2020: Non-destructive testing. Ultrasonic testing. Sensitivity and range setting---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Non-destructive testing - Ultrasonic testing - Sensitivity and range setting
ICS 19.100
J04
National Standards of People's Republic of China
Non-destructive testing ultrasonic testing sensitivity and range setting
2020-11-19 released
2021-06-01 implementation
State Administration for Market Regulation
Issued by the National Standardization Management Committee
Table of contents
Foreword Ⅰ
1 Scope 1
2 Normative references 1
3 General 1
4 Measurement of probe incident point and refraction angle 4
5 Time baseline setting 8
6 Sensitivity setting and echo height evaluation 11
Appendix A (Normative Appendix) Symbols and Definitions 20
Appendix B (Normative Appendix) Reference test block and reference reflector 22
Appendix C (Normative Appendix) Measurement of sound path and primary reflection angle of coaxial bending test piece (coaxial or concentric curved surface test piece) 25
Appendix D (informative appendix) General DGS curve diagram 29
Appendix E (informative appendix) Determination of contact transmission correction factor 31
References 34
Foreword
This standard was drafted in accordance with the rules given in GB/T 1.1-2009.
This standard uses the redrafting method to modify and adopt ISO 16811.2012 "Non-destructive testing ultrasonic testing sensitivity and range setting".
Compared with ISO 16811.2012, the main technical differences and their reasons are as follows.
--- Regarding normative reference documents, this standard has made adjustments with technical differences to adapt to my country's technical conditions and adjustments.
The situation is collectively reflected in Chapter 2 "Normative Reference Documents", and the specific adjustments are as follows.
● Replace ISO 2400 with GB/T 19799.1 which is equivalent to the international standard (see 4.2.1, 5.2, 5.4.1, 5.4.2, 6.4.2);
● Replace ISO 7963 with GB/T 19799.2 which is equivalent to the international standard (see 4.2.1, 5.2, 5.4.1, 6.4.2);
---According to the current domestic technology, the technical content of 3.4.5 "Reshaping of the probe in use" is added;
---According to ISO 16811.2012 cited EN583-2.2001 Appendix B, supplemented Table B.1 "Requirements for horizontal holes" for
DDSR requirements, modified Table B.2;
---Based on theoretical derivation and verification, the formula (C.2), formula (C.3), formula (C.5) and formula (C.6) have been modified.
This standard also made the following editorial changes.
---Adaptively adjusted the chapter number;
--- According to the standard content, the title of 3.4.4 is revised.
This standard was proposed and managed by the National Standardization Technical Committee for Nondestructive Testing (SAC/TC56).
Drafting organizations of this standard. Shanghai Institute of Materials, State Grid Zhejiang Electric Power Co., Ltd. Electric Power Research Institute, Shandong Ruixiang Mould Co., Ltd.
Company, Shanghai Aerospace Precision Machinery Institute, Shanghai Jinyi Testing Technology Co., Ltd., China General Nuclear Power Engineering Co., Ltd., Yantai CIMC Raffles Offshore
Cheng Co., Ltd., Jiangsu Fangtian Power Technology Co., Ltd., Changzhou Ultrasonic Electronics Co., Ltd.
The main drafters of this standard. Zhang Yifeng, Jiang Jiansheng, Ding Jie, Ma Jun, Zhang Jie, Luo Hongjian, Wei Zhongrui, Ma Jianmin, Wang Fei, Yu Baohong,
Luo Yundong, Zhu Congbin, Jin Lei, Liu Xubi, Xiao Xiao.
Non-destructive testing ultrasonic testing sensitivity and range setting
1 Scope
This standard specifies the baseline range and sensitivity (such as gain adjustment) when using A-scan ultrasonic detectors for manual testing.
The general rule is to ensure that the reflector position and echo height can be measured repeatedly.
This standard applies to single crystal or double crystal single probe contact technology, not applicable to liquid immersion technology and multi-probe technology.
2 Normative references
The following documents are indispensable for the application of this document. For dated reference documents, only the dated version applies to this document.
For undated references, the latest version (including all amendments) applies to this document.
GB/T 19799.1 Non-destructive testing Ultrasonic testing No. 1 calibration test block
GB/T 19799.2 Non-destructive testing Ultrasonic testing No. 2 calibration test block
EN12668-3 Non-destructive testing. Performance and inspection of ultrasonic testing equipment. Part 3.Combined system
3 General
3.1 Symbols and definitions
Symbols and definitions, see Appendix A.
3.2 The test piece, reference test block and reference reflector
The geometric characteristics requirements of common test pieces, reference test blocks and reference reflectors are shown in Appendix B.
3.3 Classification of inspected parts
The time base range and sensitivity settings depend on the geometric characteristics of the inspected part. Table 1 defines 5 categories of inspected parts.
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