GB/T 39211-2020 in English
VALIDTesting method of phased array technology for ship steel weld
- Issued on:2020-10-11
- Implemented on:2021-05-01
- File Format:PDF
- Delivery:Via email within 5 business days
$418.00
《GB/T 39211-2020船舶钢焊缝超声相控阵检测方法》由TC12（全国海洋船标准化技术委员会）归口，TC12SC2（全国海洋船标准化技术委员会造船工艺分会）执行，主管部门为国家标准化管理委员会。
Introduction
Interpretation of the core content of the standard
This standard specifies the complete technical system for ultrasonic phased array testing of ship steel welds, including key elements such as phased array ultrasonic testing instrument selection, detection technology grade classification (AD grade), and process verification test block design.
Comparison of detection technology levels
| Detection level | Beam coverage requirements | Signal-to-noise ratio (dB) | Applicable scenarios |
|---|---|---|---|
| Grade A | Single full coverage | ≥9 | Conventional welds |
| Grade B | Two full coverage at different angles | ≥9 | Important structures |
| Grade C | Three full coverage at different angles | ≥9 | Key load-bearing parts |
| Grade D | Special requirements | Determined by negotiation | Complex geometric structure |
Instrument requirements
The detection system must meet the following requirements:
- Probe frequency range: 2-10MHz
- Number of chips ≥16
- Angular resolution ≤1°
- Equipped with TCG/DAC calibration function
Typical case: TMCP steel weld detection with a thickness of 50mm requires a 5MHz linear array probe, which should be calibrated in conjunction with the large thickness test block in Appendix A.
Key points for process verification implementation
The verification test block should include:
- Horizontal through hole (φ2-6mm)
- Artificial groove (depth 0.2-3mm)
- Natural defect simulation area
Note:For workpieces with a thickness of ＞100mm, a special verification test block must be made according to the requirements of Appendix B.
Technology evolution analysis
Compared with traditional ultrasonic testing, this standard:
- Introduces the TFM full focusing algorithm to improve the quantitative accuracy of defects
- Increases the signal-to-noise ratio quantification index (≥9dB)
- Regulates the geometric requirements for multi-angle coverage (angle ≥10°)
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