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GB/T 32791-2016Electromagnetic (Eddy-Current) examination method for electrical conductivity of copper and copper alloys (English PDF)

铜及铜合金导电率涡流测试方法

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Issued by

SAMR; SAC

Level / Type

National · Recommended

Issue date

August 29, 2016

Implementation date

July 1, 2017

Scope

GB/T 32791-2016 is the English-translated version of 铜及铜合金导电率涡流测试方法.

GB/T 32791-2016 is the Chinese standard "Electromagnetic (Eddy-Current) examination method for electrical conductivity of copper and copper alloys".

Its scope clause reads: 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. Its clauses include principle of the method; terms and definitions.

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Document preview — GB/T 32791-2016

National Standard of the People's Republic of China

ICS: 77.040.99
Classification: H 21

Issued by: State Administration for Market Regulation; Standardization Administration of the PRC

1 Scope
2 principle of the method
3 terms and definitions
3.1 Volume resistivity
3.2 Volume conductivity
3.3 Conductivity
3.4 Eddy-current
3.5 Standard penetration depth

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

Resistance coefficient

Unit cross-sectional area, unit length Metal conductor resistance (referred to as resistivity), in ohms square millimeters per meter (ohm · mm2/m).

3.2 Volume conductivity

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

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).

delta = 503.3 rho/(µr · f) (1) […]

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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.

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