GB/T 3323.2-2019 in English
VALIDNon-destructive testing of welds—Radiographic testing—Part 2:X- and gamma-ray techniques with digital detectors
- Issued on:2019-08-30
- Implemented on:2020-03-01
- File Format:PDF
- Delivery:Via email within 5 business days
$612.00
《GB/T 3323.2-2019焊缝无损检测 射线检测 第2部分：使用数字化探测器的X和伽玛射线技术》由TC55（全国焊接标准化技术委员会）归口，主管部门为国家标准化管理委员会。
Introduction
Analysis of the core content of the standard
This standard specifies the technical requirements for X/γ-ray inspection of metal welded joints using CR technology of stored phosphor imaging plates (IP plates) and DR technology of digital array detectors (DDA), with a focus on ensuring that digital inspection achieves the same defect recognition capability as traditional film technology (GB/T3323.1).
Comparison of technical grade systems
| Grade | Applicable scenarios | Sensitivity requirements | Compensation measures |
|---|---|---|---|
| Grade A | Basic detection requirements | Basic image quality meter sensitivity specified in GB/T23901.1/2/5 | Increase grayscale value/SNRN |
| Grade B | High-precision detection | Optimize defect recognition capability | SNRN increased by 1.4 times |
Key Technical Innovations
1. Normalized Signal-to-Noise Ratio (SNRN)
The performance comparison of different detector systems is achieved through the formula SNRN=SNRs×(88.6/SRb), where SRb is the basic spatial resolution.
2. Triple compensation mechanism
- CPⅠ: for contrast loss caused by increased tube voltage
- CPⅡ: compensation for inherent unsharpness of detector
- CPⅢ: correction of local blur caused by bad pixels
Implementation Guide
Detector Selection Recommendations
The CR system should comply with the classification requirements of ISO16371-1, and the DDA system should be regularly calibrated for bad pixels (refer to ASTM E2597). For workpieces with wall thickness＞50mm, a microfocus DDA system is recommended.
Optimization of Transillumination Parameters
The geometric magnification M=SDD/SOD should be controlled between 1.0-3.0, and special attention should be paid to the compensation of penetration thickness difference when using Ir192 source (see Appendix B of the standard).
Image quality verification
A dual-line image quality meter (GB/T23901.5) must be used to measure the SRb value. The A-level detection requires CNRN/Δw≥3.5.
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