GB/T 18852-2020Non-destructive testing. Ultrasonic testing. Reference blocks and test procedures for the characterization of contact probe sound beams (English PDF)
无损检测 超声检测 测量接触探头声束特性的参考试块和方法
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Issued by
State Administration for Market Regulation, China National Standardization Administration
Level / Type
National · Recommended
Issue date
November 19, 2020
Implementation date
June 1, 2021
Scope
GB/T 18852-2020 is the English-translated version of 无损检测 超声检测 测量接触探头声束特性的参考试块和方法.
GB/T 18852-2020 is the Chinese standard "Non-destructive testing. Ultrasonic testing. Reference blocks and test procedures for the characterization of contact probe sound beams".
Its scope clause reads: This standard specifies the measurement method of the acoustic beam characteristics of the sound field in the workpiece when the probe is in contact with the workpiece.
Probes include straight probes and oblique probes (Refracted longitudinal wave and refracted transverse wave), focusing probe and double crystal probe. This standard recommends two metal reference test blocks, namely semicircular stepped test blocks (HS test block) and horizontal hole test block (SDH test block).
The diameter or side length of the probe element shall not exceed 25mm. This standard specifies the measurement guidelines for the acoustic beam characteristics of probes suitable for testing forged steel, rolled steel, aluminum alloy or titanium alloy products.
This standard applies The frequency range of the probe used is 1MHz~15MHz. 1MHz~5MHz is the most suitable frequency range for steel product testing. 5MHz~15MHz is the most suitable frequency range for the detection of fine-grain structure products (such as aluminum alloy products).
If this standard is applied to inspections other than steel products, inspectors should note that the sound speed of the material is different from the sound speed of steel, and at the same time, the The nominal refraction angle of the head is usually designed for inspection in steel.
This standard gives Snell's law so that inspectors can calculate other isotropic sums Refraction angle in fine-grained materials. This standard applies to oblique probes, focus probes and dual crystal probes whose actual refraction angle ranges from 0° to 70°.
This standard does not apply to surface wave (Rayleigh) probes. This standard does not involve the use of flat-bottomed test blocks to evaluate the lack of equivalent dimensions.
This standard does not stipulate the acceptance clause, but it is the inspection personnel system The acceptance clauses for determining the performance of the probe establish a technical basis. Its clauses include terms and definitions; symbols and abbreviations.
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Document preview — GB/T 18852-2020
National Standard of the People's Republic of China
- ICS
- 19.100
- Classification
- J 04
- Replacing
- GB/T 18852-2002
Issued by: State Administration for Market Regulation, China National Standardization Administration
Contents
- Preface
- 1 Scope
- 2 Normative references
- 3 Terms and definitions
- 4 Symbols and abbreviations
- 5 Reference test block
- 6 Technology and process regulations
- Appendix A (Normative Appendix) Time Baseline Setting (Range Setting)
- Appendix B (Normative Appendix) Time-to-sound (TOF) characteristic curve of sound beam cross section
- Appendix C (informative appendix) Deflection angle, far-field and near-field resolution
1 Scope
This standard specifies the measurement method of the acoustic beam characteristics of the sound field in the workpiece when the probe is in contact with the workpiece. Probes include straight probes and oblique probes (Refracted longitudinal wave and refracted transverse wave), focusing probe and double crystal probe. This standard recommends two metal reference test blocks, namely semicircular stepped test blocks (HS test block) and horizontal hole test block (SDH test block). The diameter or side length of the probe element shall not exceed 25mm.
This standard specifies the measurement guidelines for the acoustic beam characteristics of probes suitable for testing forged steel, rolled steel, aluminum alloy or titanium alloy products. This standard applies
The frequency range of the probe used is 1MHz~15MHz. 1MHz~5MHz is the most suitable frequency range for steel product testing.
5MHz~15MHz is the most suitable frequency range for the detection of fine-grain structure products (such as aluminum alloy products).
If this standard is applied to inspections other than steel products, inspectors should note that the sound speed of the material is different from the sound speed of steel, and at the same time, the
The nominal refraction angle of the head is usually designed for inspection in steel. This standard gives Snell's law so that inspectors can calculate other isotropic sums
Refraction angle in fine-grained materials. This standard applies to oblique probes, focus probes and dual crystal probes whose actual refraction angle ranges from 0° to 70°.
This standard does not apply to surface wave (Rayleigh) probes.
This standard does not involve the use of flat-bottomed test blocks to evaluate the lack of equivalent dimensions. This standard does not stipulate the acceptance clause, but it is the inspection personnel system
The acceptance clauses for determining the performance of the probe establish a technical basis.
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.
ISO 5577 Nondestructive Testing Ultrasonic Testing Terminology
ISO 7963 Nondestructive Testing Ultrasonic Testing No. 2 Test Block
3 Terms and definitions
The terms and definitions defined by ISO 5577 apply to this document.
4 Symbols and abbreviations
4.1 Symbols
The symbols listed in Table 1 apply to this document.
GB/T 19348.1 | GB/T 19096 | GB/T 18851.2 | GB/T 18851.1 | […]
......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 40 pages — is available in the English PDF.
Referenced standards
Normative references
ISO 5577 · ISO 7963
Cited by
- GB/T 32073.1-2025Non-destructive testing - Ultrasonic method for measuring residual stress - Part 1: Critically refracted longitudinal wave method
- GB/T 32073.2-2025Non-destructive testing - Ultrasonic method for measuring residual stress - Part 2: Bulk wave method
- GB/T 6519-2024Ultrasonic inspection of wrought aluminium and magnesium alloy products
- GB/T 43232-2023Fasteners—Measurement method of axial stress by ultrasonic
- GB/T 4162-2022Method for ultrasonic testing of forged and rolled steel bars
- GB/T 38952-2020Non-destructive testing--Testing method for measuring residual stress using bulk wave
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