GB/T 20935.2-2018 in English
SUPERSEDEDMetal materials—Method of electromagnetic acoustic inspection—Part 2: Standard practice for ultrasonic testing using electromagnetic acoustic transducer (EMAT) techniques
- Issued on:2018-03-15
- Implemented on:2018-12-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$214.00
《GB/T 20935.2-2018金属材料 电磁超声检测方法 第2部分：利用电磁超声换能器技术进行超声检测的方法》由TC183（全国钢标准化技术委员会）归口，TC183SC19（全国钢标准化技术委员会钢产品无损检测分会）执行，主管部门为中国钢铁工业协会。
Introduction
GB/T 20935.2—2018 Standard Overview
GB/T 20935.2—2018, National Standard of the People's Republic of China, "Methods for electromagnetic ultrasonic testing of metallic materials", Part 2, mainly regulates the method of ultrasonic testing using electromagnetic ultrasonic transducer (EMAT) technology. This standard replaces GB/T20935.2—2009, focusing on the excitation and reception principles of surface waves, Lamb waves and body waves, and specifies the requirements for equipment calibration, test methods and result determination.
Comparative Analysis of Standard Frameworks
| Dimensions | GB/T 20935.2—2018 | GB/T20935.2—2009 | Differences |
|---|---|---|---|
| Scope | Applicable to situations where electromagnetic ultrasonic transducer technology is superior to traditional piezoelectric technology | Consistent with GB/T20935.1 | Added application scenarios of surface wave and Lamb wave |
| Definition of Terms | Added definitions of terms such as EMAT and surface wave | Consistent with GB/T20935.1 | The terminology system is more complete |
| Verification requirements | New verification methods for equipment sensitivity and frequency characteristics | No clear verification requirements | Standardized verification process |
Implementation suggestions
1. Equipment selection and verification
Suggestion: When selecting an electromagnetic ultrasonic transducer, the appropriate operating frequency and waveform mode (such as surface wave, Lamb wave or body wave) should be selected according to the specific application scenario. Equipment verification should use comparison samples in accordance with standard requirements, and sensitivity verification should be performed regularly.
2. Training of testing personnel
Suggestion: Testing personnel should have non-destructive testing qualifications (such as GB/T9445) and receive special electromagnetic ultrasonic technology training. Focus on mastering the excitation and reception principles of surface waves and body waves, as well as the propagation characteristics of different waveforms in different materials.
3. Data recording and analysis
Suggestions: During the inspection process, signal parameters (such as reflected wave amplitude, propagation time, etc.) should be recorded in real time, and data analysis should be performed in combination with standard requirements. For complex workpieces, A-scan display and data acquisition systems can be used to assist in judgment.
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