GB/T 39242-2020Non-destructive testing. Ultrasonic testing. Sensitivity and range setting (English PDF)

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.

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