GB/T 42872-2023 in English
VALIDNon-destructive testing—Ultrasonic testing and evaluation for turbing-blades in service
- Issued on:2023-08-06
- Implemented on:2023-08-06
- File Format:PDF
- Delivery:Within 1 day
$357.00
《GB/T 42872-2023无损检测 在役汽轮机叶片超声检测和评价方法》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
Analysis of standard technical framework
| Core elements | Technical requirements | Innovation points |
|---|---|---|
| Detection frequency range | 0.5MHz-15MHz | Covering full-size defect detection |
| Probe type | 6 types of special probes | Optimized for different blade root structures |
| Sensitivity setting | DAC curve method | Dynamic compensation mechanism |
Detailed explanation of key detection technologies
1. Instrument system configuration
The standard requires that the detection system must comply with GB/T 27664 series specification, special provisions:
- Time base linearity deviation ≤ 1%
- Sensitivity fluctuation ≤ 2dB during 4-hour stability test
- Use 2Cr13 martensitic steel comparison test block
2. Special inspection plan for blade root
| Blade root type | Optimal probe | Detection difficulties |
|---|---|---|
| Forked blade root | Surface wave/shear wave probe | Crack identification beside rivet hole |
| T-shaped blade root | Small angle longitudinal wave probe | Crack shielding effect at end corner |
| Fir-tree shaped blade root | Shear wave probe | Multi-tooth structure interference |
Typical defect waveform characteristics
Case: Forked blade root crack detection
When there is a rivet hole crack, the waveform presents:
- Blade root end surface echo attenuation ≥60%
- Crack echo appears after the structure echo
- DAC curve shows that the amplitude exceeds the scrap line
Standard implementation recommendations
- Establish a blade acoustic characteristics database
- Develop a dedicated simulation test block
- Use a digital detection system to record the full waveform
Loading PDF document...
Error loading PDF. Please make sure the file is valid and try again.
We also recommend
-
GB/T 23900-2009 in English
Non-destructive testing—Practice for measuring ultrasonic velocity in materials
2009-05-26 -
GB/T 33877-2017 in English
Non-destructive testing―Test method for comparing the brightness of fluorescent penetrants
2017-07-12 -
GB/T 44525-2024 in English
Non-destructive testing—Ultrasonic testing—Specification for resin matrix composite reference block
2024-09-29 -
GB/T 46978-2026 in English
Non-destructive testing—Methods of alternating current field measurement (ACFM) for metal structures
2026-01-28 -
GB/T 40117-2021 in English
Non-destructive testing - Evaluation of vision acuity of NDT personnel
2021-05-21 -
GB/T 17455-2008 in English
Non-destructive testing - Metallographic replica techniques of surface examination
2008-07-30 -
GB/T 21355-2022 in English
Non-destructive testing—Industrial computed radiography with storage phosphor imaging plates—Classification of systems
2022-03-09 -
GB/T 5097-2020 in English
Non-destructive testing—Penetrant testing and magnetic particle testing—Viewing conditions
2020-07-21 -
GB/T 30564-2023 in English
Non-destructive testing—NDT personnel training organizations
2023-05-23 -
GB/T 18694-2002 in English
Non-destructive testing - Ultrasonic inspection - Characterization of search unit and sound field
2002-03-10
