GB/T 40730-2021 English PDF

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GB/T 40730-2021: Non-destructive testing - Measuring thickness by electromagnetic ultrasonic pulse-echo
Status: Valid

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Basic data

Standard ID: GB/T 40730-2021 (GB/T40730-2021)
Description (Translated English): Non-destructive testing - Measuring thickness by electromagnetic ultrasonic pulse-echo
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: J04
Word Count Estimation: 26,215
Issuing agency(ies): State Administration for Market Regulation, China National Standardization Administration

GB/T 40730-2021: Non-destructive testing - Measuring thickness by electromagnetic ultrasonic pulse-echo

---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 - Measuring thickness by electromagnetic ultrasonic pulse-echo ICS 19.100 CCSJ04 National Standards of People's Republic of China Non-destructive testing Electromagnetic ultrasonic pulse echo type thickness measurement method Released on 2021-10-11 2022-05-01 implementation State Administration of Market Supervision and Administration Issued by the National Standardization Management Committee

Table of contents

Foreword Ⅰ 1 Scope 1 2 Normative references 1 3 Terms and definitions 1 4 Thickness measurement principle, thickness value calculation and thickness measurement type 1 5 Personnel requirements 4 6 Safety requirements 4 7 Inspection process regulations 4 8 Testing equipment and equipment 5 9 Testing procedures 8 10 Uncertainty of measurement results 12 11 Inspection records and reports 12 Appendix A (informative) The main advantages and limitations of electromagnetic ultrasonic thickness measurement 14 Appendix B (Informative) Temperature of Commonly Used Materials-Transverse Wave Sound Velocity Table 15 Appendix C (informative) Method of measuring material temperature-sound velocity curve with electromagnetic ultrasonic thickness gauge 18 Appendix D (informative) Factors affecting the measurement uncertainty of electromagnetic ultrasonic thickness measurement results 21

Foreword

This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for Standardization Work Part 1.Structure and Drafting Rules of Standardization Documents" Drafting. Please note that some of the contents of this document may involve patents, and the issuing agency of this document is not responsible for identifying patents. This document was proposed and managed by the National Standardization Technical Committee for Nondestructive Testing (SAC/TC56). Drafting organizations of this document. China Special Equipment Inspection and Research Institute, Shanghai Institute of Materials Research, North University of China, Tsinghua University, University of Electronic Science and Technology of China, Guangdong Shantou Ultrasonic Electronics Co., Ltd. Ultrasonic Instrument Branch, Wuhan Zhongke Innovation Technology Co., Ltd., Hefei General Machinery Research Institute Co., Ltd., Nanchang Hangkong University. The main drafters of this document. Zheng Yang, Shen Gongtian, Zhou Jinjie, Zhang Zongjian, Zhou Junfeng, Li Sujun, Lan Qi, Huang Songling, Li Xiang, Zhan Hongqing, Wang Zicheng, Ding Jie, Zhu Yuhong, Tan Jidong, Yan Changzhou, Shi Wenze. Non-destructive testing Electromagnetic ultrasonic pulse echo type thickness measurement method

1 Scope

This document specifies the method of material thickness measurement using electromagnetic ultrasonic transducer to excite and receive ultrasound. This document is applicable to steel, non-ferrous metals and other materials that use electromagnetic ultrasonic transducers with a temperature range of -196℃~800℃. Measurement of materials that emit ultrasound.

2 Normative references

The contents of the following documents constitute the indispensable clauses of this document through normative references in the text. Among them, dated quotations Only the dated version is applicable to this document; for undated reference documents, the latest version (including all amendments) is applicable to This document. GB/T 9445 Qualification and certification of non-destructive testing personnel GB/T 12604.1 Non-destructive testing term Ultrasonic testing GB/T 27418 Evaluation and Expression of Uncertainty in Measurement GB/T 34885 Non-destructive testing General rules for electromagnetic ultrasonic testing

3 Terms and definitions

The terms and definitions defined in GB/T 12604.1, GB/T 27418 and GB/T 34885 apply to this document. 4 Thickness measurement principle, thickness value calculation and thickness measurement type 4.1 Principle of Thickness Measurement Electromagnetic ultrasound technology realizes the excitation and reception of ultrasound by means of electro-magnetic-acoustic coupling. The core transducer of electromagnetic ultrasound The parts are magnets and coils, and the basic working principle is shown in Figure 1.During the electromagnetic ultrasonic excitation process, when the coil placed above the When a transient alternating electrical signal is used, an induced eddy current is generated on the surface of the tested material, and a dynamic magnetic field is induced by the coil at the same time. The material in the eddy current region is biased magnetically Under the action of electric field and dynamic magnetic field, it is affected by Lorentz force. Since the alternating current passes through the coil, the induced eddy current is also alternating. The Lorentz force of each particle in the material in the vortex zone is also alternating. This alternating force causes the surface particles of the material to vibrate, such as If the alternating frequency is the ultrasonic frequency band, the generated vibration is manifested as ultrasonic vibration, that is, the ultrasonic is excited in the material. If the inspected material is iron In addition to the alternating Lorentz force, magnetic materials also have alternating magnetostrictive force and magnetizing force. Under the combined action of the three forces, the material Ultrasonic vibration of surface particles produces ultrasound. The electromagnetic ultrasonic receiving process is the inverse process of excitation. The electromagnetic ultrasonic thickness measurement method does not directly measure the thickness, but obtains the thickness of the measured object from the product of the ultrasonic propagation time and the velocity. The propagation time is the time of one propagation of ultrasound on the thickness path of the measured object or the time difference of multiple reciprocating propagations. Refer to Appendix A for the main advantages and limitations of the electromagnetic ultrasonic thickness measurement method. ......

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