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GB/T 29997-2013: Eddy current testing method of copper and copper-alloys rods, bars and wires
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Eddy current testing method of copper and copper-alloys rods, bars and wires
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GB/T 29997-2013
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Basic data | Standard ID | GB/T 29997-2013 (GB/T29997-2013) | | Description (Translated English) | Eddy current testing method of copper and copper-alloys rods, bars and wires | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | H26 | | Classification of International Standard | 77.040.20 | | Word Count Estimation | 13,160 | | Quoted Standard | GB/T 5248-2008; GB/T 9445-2005; GB/T 12604.6-2008 | | Regulation (derived from) | National Standards Bulletin 2013 No. 23 | | 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 | | Summary | This standard specifies the copper and copper alloy rod and wire carried through the style and point eddy current method, comparative samples, equipment, and assess the results of the procedure. This standard applies to eddy current 2mm-diameter outer dia | GB/T 29997-2013: Eddy current testing method of copper and copper-alloys rods, bars and wires---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Eddy current testing method of copper and copper-alloys rods, bars and wires
ICS 77.040.20
H26
National Standards of People's Republic of China
Copper and copper alloy rod and wire eddy current testing method
Eddycurrenttestingmethodofcopperandcopper-aloysrods, barsandwires
Issued on. 2013-11-27
2014-08-01 implementation
Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China
Standardization Administration of China released
Foreword
This standard was drafted in accordance with GB/T 1.1-2009 given rules.
The standard reference adopted ASTME1606-2009 "electrician with heavy copper bars and electromagnetic (eddy current) detection method."
This standard by the national non-ferrous metals Standardization Technical Committee (SAC/TC243) centralized.
This standard is drafted by. China Nonferrous Metals Industry Nondestructive Testing Center, Foshan Huahong Copper Tube Co., Ltd., Chinalco Luoyang Copper
Ltd., Chinalco Shanghai Copper Co., Ltd.
The main drafters of this standard. Ji Chang, Jingshuitan Li Xianghai, Li Xiao Tao, Xi Guoping, Shi Haiqing, Zhang Xi, Jiang Jie, Zhang Xiaoqing.
Copper and copper alloy rod and wire eddy current testing method
1 Scope
Of copper and copper alloy rod and wire were encircling point and eddy current inspection of this standard, the comparative sample, equipment, operation of step
Sudden and assessment of results.
This standard applies to the outer diameter Φ2mm ~ Φ100mm wire rod surface and near surface defects eddy current test, the other specifications of the rod or wire
Executive may refer to this standard.
Note. The rod and wire eddy current test should be performed on automatic transmissions, manual for eddy current testing, negotiated by the supply and demand sides.
2 Normative references
The following documents for the application of this document is essential. For dated references, only the dated version suitable for use herein
Member. For undated references, the latest edition (including any amendments) applies to this document.
GB/T 5248-2008 Copper and copper alloy seamless pipe eddy current testing method
GB/T 9445-2005 NDT personnel qualification and certification
GB/T 12604.6-2008 Terminology for nondestructive testing Eddy current testing
3 Terms and definitions
The following terms and definitions apply to this document.
3.1
(Copper wire) line eddy current flaw detection method for on-lineeddycurrenttestingmethodofcopperrods, barsandwires
By electromagnetic induction copper wire surface and near surface eddy current principle, the production process and semi-finished rod and wire feed
Testing method row the entire disk or entire volumes.
3.2
(Copper wire) offline eddy current testing method off-lineeddycurrenttestingmethodofcopperrods, barsandwires
By electromagnetic induction copper wire surface and near surface eddy current principle, the production process and semi-finished rod and wire feed
Root or one by one flaw detection method by row.
3.3
SNR signaltonoiseratio
Noise ratio of signal amplitude and the maximum amplitude of the signal at the output of the eddy current flaw defect.
3.4
Zero potential differenceofinduced-potential
Differential detection coil induced voltage differential connection between the windings formed. Within the detection coil has zero potential for the load when the test piece.
In the detection coil when no test piece is unloaded zero potential.
3.5
Pass type eddy current method of feed-througheddycurrenttestingmethod
Through the use of eddy current detection coil eddy current testing methods.
3.6
Point eddy current testing method probecoileddycurrenttestingmethod
Using point coil eddy current testing eddy current testing method.
3.7
Standard depth of penetration standarddepthofpenetration
Eddy current penetration depth of the conductivity in the subject bar and wire rod and wire, the detection frequency. Eddy Current Testing, Eddy Current density dropped to a sample
The depth of the surface vortex called density 1/e (about 37%), the standard depth of penetration, which are calculated in the formula (1).
δ = 503.3 ρ/μrf =
503.3
μr · σ · f
(1)
Where.
[delta] --- standard penetration depth in millimeters (mm);
ρ --- subject resistivity of the sample, ohms square millimeter per meter (Ω · mm2/m);
σ --- conductivity of the test sample, in units of ohms per meter square millimeter [m/(Ω · mm2)]
f --- detection frequency in hertz (Hz);
μг --- the relative permeability of the test sample, for the non-ferromagnetic material, μг nearly 1, dimensionless.
NOTE. rewrite GB/T 12604.6-2008, definitions 2.11.
3.8
Effective penetration depth effectivedepthofpenetration
The ability to more than one standard depth of penetration by the eddy current test method will reduce the discontinuity defect, generally accepted testing or mechanical metallurgy
Limit the depth of defects is 3δ, and it is called the effective penetration depth.
NOTE. rewrite GB/T 12604.6-2008, definitions 2.12.
3.9
Excitation frequency excitationfrequency
Excitation current nominal frequency.
[GB/T 12604.6-2008, definitions 2.16. ]
3.10
Probe probe
It comprises an eddy current sensor excitation and receiving unit.
[GB/T 12604.6-2008, definitions 4.1. ]
3.11
Detection coil fill factor coilfilfactor
Through the outer coil, equal to the cross-sectional area than the outer diameter of the subject and the coil inner diameter of the cross-sectional area. Through to the inner coil, equal
The cross-sectional area than the coil outer diameter of the cross-sectional area of \u200b\u200bthe subject member.
[GB/T 12604.6-2008, definitions 4.51. ]
3.12
End effect endeffect
Means that when the rod is in the detection coil wire ends, interfering signal distortion due to eddy currents flow path generated.
NOTE. rewrite GB/T 12604.6-2008, definitions 6.27.
3.13
Amplitude analysis amplitudeanalysis
The amplitude of the signal evaluation techniques.
[GB/T 12604.6-2008, definitions 7.1. ]
3.14
Phase analysis phaseanalysis
Eddy current testing phase angle signal measurement and analysis of the implementation of technology.
[GB/T 12604.6-2008, definitions 7.3. ]
3.15
j) the date of testing.
Appendix A
(Normative)
Copper and copper alloy rod line automatic eddy current flaw detection device offline Comprehensive Performance Test Method
A.1 Scope
This appendix provides off-line testing of copper and copper alloy rod and wire automatic eddy current testing equipment comprehensive performance test conditions, methods and test items
Head and shall meet the minimum performance criteria.
A.2 Test conditions
A.2.1 eddy current flaw detectors and equipment should comply with this standard in Chapter 5.
When A.2.2 test should be carried out at 50m/min ~ 60m/min speed of testing. It should accurately record the excitation frequency, gain, phase and filter
Wave, testing speed, rod and wire diameter, the detection coil specifications and other parameters. Such as the use of saturation magnetization, but also record the magnetizing current, voltage magnetic remanence
Detection value.
A.3 standard artificial defects like rod (wire)
A.3.1 standard labor-like rod (wire) production shall comply with the provisions of Chapter 6 of the standard.
A.3.2 standard testing artificial defects like rod (wire) can be detected on the basis of the outer diameter of the device under test commonly used in the types of products and equipment
Rod and wire diameter size specifications for the upper limit.
A.4 Test items and methods
A.4.1 circumferential poor sensitivity
Adjust the detection sensitivity, the standard artificial defect rod (wire) in the circumferential direction 120 ° in the middle of three artificial defects just the alarm and continuous walking
Five were police. Gain value at that time write down.
Adjust the detection sensitivity, the standard rod-like artificial defects (line) to 120 ° circumferential middle three artificial defect is not just the police, and continuous
Walking 5 times without warning. Gain value at that time write down.
Z = Z1-Z2 (A.1)
Where.
Z --- circumferential sensitivity difference, in decibels (dB);
Gain value Z1 --- standard artificial defect rod (wire) in the middle of three artificial defects in alarm just in decibels (dB);
Gain value Z2 --- standard artificial defect rod (wire) in the middle of three artificial defects just not alarm, in decibels (dB).
A.4.2 SNR
DB value adjustment of detection sensitivity, continuous test five times, just to make noise alarm, note the time gain value.
S/N = Z3-Z1 (A.2)
Where.
S/N --- N ratio in decibels (dB);
Gain value Z1 --- standard artificial defect rod (wire) in the middle of three artificial defects in alarm just in decibels (dB);
Gain value Z3 --- just alert noise, in decibels (dB).
A.4.3 false negative rate
On the basis of Z1 improve detection sensitivity value on the amount of sensitivity 2dB, and walk for 50 times, note the omission of artificial defect
frequency.
K1 = [N1/(N2 × 50)] × 100% (A.3)
Where.
K1 --- false negative rate,%;
N1 --- underreporting the number of artificial defects;
N2 --- standard artificial defect rod (wire) in the number of artificial defects.
A.4.4 false alarm rate
On the basis of the amount of 2dB increase the sensitivity of the detection sensitivity of the Z1, and walk for 50 times, more than a note of the number of artificial defects in alarm
The number of false alarms. Every time walking, appear more than once and once false positives were recorded as false positives 1 times.
K2 = (N3/50) × 100% (A.4)
Where.
K2 --- false positive rate,%;
N3 --- the number of false positives.
A.4.5 undetectable end zone (blind)
On the basis of Z1 2dB increase detection sensitivity value, under the effect of rod and wire ends are cut under the premise of continuous test five times,
So that the standard rod-like artificial defects (lines) 2 artificial defects both ends alarm.
From the artificial defect and the end of the line at both ends of the rod is the length between the non-detection zone.
A.4.6 artificial flaw size resolution
Artificial flaw size resolution in accordance with Figure A.1 production. Under the same conditions the dB value of the sensitivity, the test five times in a row, just alarm
The difference between the aperture and not just artificial defect aperture between the artificial defect alarm that is artificial defect size resolution.
γ = d1-d2 (A.5)
Where.
γ --- artificial flaw size resolution, millimeters (mm);
D1 --- just artificial defect alarm pore size in millimeters (mm);
Artificial defects d2 --- just no alarm aperture in millimeters (mm).
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