GB/T 39283-2020Non-destructive testing—Testing method for surface-wave testing using electromagnetic acoustic transducer (EMAT) techniques (English PDF)
无损检测 电磁声换能器（EMAT）技术表面波检测方法
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Issued by
SAMR; SAC
Level / Type
National · Recommended
Issue date
November 19, 2020
Implementation date
June 1, 2021
Scope
GB/T 39283-2020 is the English-translated version of 无损检测 电磁声换能器（EMAT）技术表面波检测方法.
GB/T 39283-2020 is the Chinese standard "Non-destructive testing—Testing method for surface-wave testing using electromagnetic acoustic transducer (EMAT) techniques".
Its scope clause reads: This standard specifies the general method for electromagnetic ultrasonic surface wave testing, which is used to detect surface openings and buried depths not less than the surface wave wavelength Surface discontinuity.
This standard applies to surface wave detection of conductive or magnetic materials. Its clauses include terms and definitions; method summary.
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Document preview — GB/T 39283-2020
National Standard of the People's Republic of China
- ICS
- 19.100
- Classification
- J 04
Issued by: State Administration for Market Regulation; Standardization Administration of the PRC
Contents
- Foreword
- 1 Scope
- 2 Normative references
- 3 Terms and definitions
- 4 Method summary
- 5 Safety requirements
- 6 Personnel requirements
- 7 Inspection process regulations
- 8 Testing equipment and equipment
- 9 Testing Procedure
- 10 Recording and evaluation
- 11 Inspection records and reports
1 Scope
This standard specifies the general method for electromagnetic ultrasonic surface wave testing, which is used to detect surface openings and buried depths not less than the surface wave wavelength
Surface discontinuity.
This standard applies to surface wave detection of conductive or magnetic materials.
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 article
Pieces. For undated references, the latest version (including all amendments) applies to this document.
GB/T 5616 Application Guidelines for Nondestructive Testing
GB/T 9445 Non-destructive testing personnel qualification and certification
GB/T 12604.1 Non-destructive testing term Ultrasonic testing
GB/T 20737 Non-destructive testing general terms and definitions
GB/T 23904 Non-destructive testing ultrasonic surface wave testing method
GB/T 23905 Non-destructive testing test block for ultrasonic testing
GB/T 34885 Non-destructive testing General rules for electromagnetic ultrasonic testing
JB/T 9214 Non-destructive testing A-type pulse reflection ultrasonic testing system performance test method
3 Terms and definitions
The terms and definitions defined in GB/T 5616, GB/T 12604.1, GB/T 20737, GB/T 23904 and GB/T 34885 apply to
This document.
4 Method summary
4.1 Detection principle
Electromagnetic ultrasonic surface wave detection uses a vertical permanent magnet bias magnetic field (shown in Figure 1) or a horizontal AC bias magnetic field to match the surface wave
The probe of the reflex coil (shown in Figure 2) with a periodic wavelength, using the principle of electro-magnetic-acoustic interaction to excite and receive the ultrasonic meter on the surface of the material
Surface wave. When surface wave encounters a discontinuity, reflection, diffraction or transmission attenuation occurs, and it is detected by the change of reflection signal, transmission signal or diffraction signal.
Measure the position and size of the discontinuity.
......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.
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