GB/T 35393-2017 in English
VALIDNon-destructive testing—Practice for electromagnetic(eddy-current) sorting of nonferrous metals
- Issued on:2017-12-29
- Implemented on:2018-04-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$156.00
《GB/T 35393-2017无损检测 非铁磁性金属电磁（涡流）分选方法》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化管理委员会。
Introduction
Non-destructive testing of non-ferromagnetic metals electromagnetic (eddy current) sorting standard interpretation
| Standard dimensions | Technical requirements | Implementation recommendations |
|---|---|---|
| Method classification | Absolute coil method and comparative coil method are suitable for different detection scenarios. | Select the appropriate method according to the characteristics of the workpiece and the detection sensitivity requirements, and ensure accuracy through calibration. |
| Equipment requirements | Electromagnetic sorting instruments must have high sensitivity and stability, and the detection coils should be of appropriate specifications to ensure the best filling factor. | Calibrate equipment parameters regularly and use high-quality pads to reduce interference from the lift-off effect. |
| Comparison test block management | Qualified and unqualified comparison test blocks need to be prepared to ensure that they have similar shapes, sizes and surface conditions as the inspected workpieces. | Establish a comparison test block management system, regularly check their performance, and use three comparison test blocks in three-mixed material sorting to improve sorting accuracy. |
Standard formulation background and technology evolution analysis
Background:With the widespread application of non-ferromagnetic metals in industry, traditional detection methods have gradually exposed the problems of low efficiency and insufficient sensitivity. Eddy current sorting, as an efficient and non-destructive detection method, has become an important technology to solve this problem.
Technology evolution: From the initial single frequency detection to the application of multi-frequency detection technology, and then to the development of modern intelligent instruments, eddy current sorting technology has made significant progress in sensitivity, stability and applicability. In particular, the introduction of the comparison coil method has greatly improved the anti-interference ability of detection.
Explanation of professional terms and practical application cases
Absolute coil method: The instrument is calibrated by a known comparison test block to directly measure the electrical characteristic parameters of the inspected workpiece. For example, in the sorting of aluminum materials, comparison test blocks with different heat treatment states are used for calibration.
Comparison coil method: Sorting is performed using the signal difference between the reference coil and the detection coil. Applicable to scenarios with high sensitivity requirements, such as the screening of precision electronic components.
Implementation suggestions
- Staff training: Ensure that operators have the corresponding non-destructive testing qualifications (GB/T9445), and regularly conduct technical updates and practical exercises.
- Equipment maintenance:Regularly calibrate the electromagnetic sorting instrument, check the coil performance, and maintain the stability of the mechanical transmission device.
- Comparison test block management:Establish a standardized comparison test block management system to ensure its stability, and perform temperature control and cleaning before use.
- Test environment optimization:Reduce external interference factors (such as vibration, electromagnetic field), and maintain a constant temperature environment to improve detection accuracy.
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