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GB/T 32791-2016: Electromagnetic (eddy-current) examination method for electrical conductivity of copper and copper alloys
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| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| GB/T 32791-2016 | English | 159 |
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Electromagnetic (eddy-current) examination method for electrical conductivity of copper and copper alloys
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GB/T 32791-2016
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Basic data | Standard ID | GB/T 32791-2016 (GB/T32791-2016) | | Description (Translated English) | Electromagnetic (eddy-current) examination method for electrical conductivity of copper and copper alloys | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | H21 | | Classification of International Standard | 77.040.99 | | Word Count Estimation | 8,850 | | Date of Issue | 2016-08-29 | | Date of Implementation | 2017-07-01 | | Regulation (derived from) | National Standard Announcement 2016 No.14 | | Issuing agency(ies) | General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China | GB/T 32791-2016: Electromagnetic (eddy-current) examination method for electrical conductivity of copper and copper alloys
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Electromagnetic (eddy-current) examination method for electrical conductivity of copper and copper alloys
ICS 77.040.99
H21
National Standards of People's Republic of China
Copper and copper alloy conductivity vortex test method
Electromagnetic (eddy-current) examinationmethodfor
2016-08-29 released
2017-07-01 implementation
General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China
China National Standardization Management Committee released
Foreword
This standard is drafted in accordance with the rules given in GB/T 1.1-2009.
This standard is proposed by China Nonferrous Metals Industry Association.
This standard is owned by the National Committee for the Standardization of Nonferrous Metals (SAC/TC243).
The drafting unit of this standard. Zhongluo Luoyang Copper Co., Ltd., Foshan Huahong Copper Tube Co., Ltd., Anhui Xinke New Material Co., Ltd.
Division, the national copper and aluminum smelting and processing of product quality supervision and inspection center, Ningbo Xingtai Shengtai Group Co., Ltd., Anhui Chujiang Science and Technology New Materials
Co., Ltd., Taiyuan Jinxi Chunlei Copper Co., Ltd., Suzhou Nonferrous Metal Research Institute Co., Ltd.
The main drafters of this standard. Li Xianghai, Lin Guoliang, Lou Dongge, Wang Shidong, Han Yi, Jia Zhijun, Gu Fengxian, Ge Xiaonui, Mao Yaodong,
Gao Yuhong, Yuan Hefeng, Wang Dongya, Mei Guilin, Hu Yong, Chang Fen, Zheng Xiaoying.
Copper and copper alloy conductivity vortex test method
1 Scope
This standard specifies the principle, terminology and definition of the conductivity of copper and copper alloys by eddy current method, test requirements, operating methods and tests
report.
This standard applies to the use of eddy current conductivity tester for ferromagnetic copper and copper alloy materials or products for conductivity testing.
2 principle of the method
When the coil carrying the alternating current (also known as the probe) is close to the surface of the conductive material, due to the effect of the alternating magnetic field of the coil,
Near-surface induction of the spiral current is called eddy current. The eddy current in the material also produces its own magnetic field reaction to the coil, which is counterproductive
Small and the material surface and near the surface of the conductivity. The conductivity of non-ferromagnetic conductive materials can be directly detected by a vortex conductor.
3 terms and definitions
The following terms and definitions apply to this document.
3.1
Volume resistivity volumespecificalresistance
Resistance coefficient
Unit cross-sectional area, unit length Metal conductor resistance (referred to as resistivity), in ohms square millimeters per meter (Ω · mm2/m).
3.2
Volume conductivity volumeelectricconductivity
Conductivity coefficient
The reciprocal of the volume resistivity (referred to as conductivity) in meters per meter (MS/m).
3.3
Conductivity
The percentage of the ratio of the conductivity of a sample to a standard value.
Note. The correspondence between conductivity, conductivity and resistance coefficient is given in Appendix A.
3.4
Eddy-current
Due to the external magnetic field has time and space changes in the conductive material on the surface and near the surface of the induced current.
3.5
Standard penetration depth standarddepthofpenetration
In eddy current testing, the eddy current density decreases to 1/e (about 37%) of the eddy current density on the sample surface. Standard penetration depth calculation
See equation (1).
δ = 503.3 ρ/(μr · f) (1)
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