GB/T 23904-2025 in English
VALIDNon-destructive testing—Test method for ultrasonic testing by surface wave
- Issued on:2025-05-30
- Implemented on:2025-09-01
- File Format:PDF
- Delivery:Within 1 day
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《GB/T 23904-2025无损检测 超声表面波检测方法》由TC56（全国无损检测标准化技术委员会）归口，主管部门为国家标准委。
Introduction
Core changes in the standard revision
| Technical elements | 2009 edition | 2025 edition |
|---|---|---|
| Detection sensitivity adjustment | Rectangular notch method only | New flat-bottom hole method + right-angle edge method |
| Probe frequency correspondence | Single frequency-notch correspondence table | Dual frequency interval-reflector correspondence table |
| System performance requirements | Time base linearity ≤1% | Time base linearity ≤0.5% |
Key technical requirements of the detection system
Performance indicators of ultrasonic instruments
- Working frequency range: 0.5-10MHz
- Gain adjustment: ≥80dB continuously adjustable, step ≤1dB
- Linear deviation: time base ≤0.5%, amplitude ≤5%
Probe selection specifications
- Chip area ≤500mm², rectangular side length ≤25mm
- Recommended frequency: 1-5MHz
- Curved surface detection gap ≤0.5mm
Comparison of sensitivity adjustment methods
| Method | Applicable scenarios | Gain compensation |
|---|---|---|
| Right-angle edge method | Workpiece with right-angle edge | +24dB |
| Rectangular notch method | Standard test block detection | +18dB |
| Flat-bottom hole method | New comparison test block | +6dB |
Implementation points
Precautions for curved surface detection
- Curvature radius ≥ 22.5mm
- Pay attention to 180° echo coverage during circumferential scanning
- The bottom surface of the probe needs to be ground to match the curved surface
DAC curve drawing specifications
- Take at least 3 points at different distances
- The reference point is set to 80% of the wave height
- For the determination of the single detection range, see Appendix C
Technology Evolution Analysis
The 2025 version of the standard mainly reflects three major technological advances:
- Multiple types of artificial reflectors: Add flat-bottom hole test blocks to meet the needs of defect detection of different shapes
- Improved detection accuracy: The time-base linearity requirement is increased from 1% to 0.5%
- Digital adaptation: Clarify the requirements for digital drawing of DAC curves to lay the foundation for automated detection
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