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GB/T 29197-2012 English PDF (GBT29197-2012)

GB/T 29197-2012 English PDF (GBT29197-2012)

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GB/T 29197-2012: Copper-clad aluminum wire

This Standard specifies the product classification, model, requirements, test methods, inspection rules, packaging, marking, transportation and storage of copper-clad aluminum wire. This Standard applies to bare round copper-clad aluminum wires for electricians. The typical use of the copper-clad aluminum wire is the inner conductor of the radio frequency coaxial cable; other uses are also available.
GB/T 29197-2012
GB
NATIONAL STANDARD OF THE
PEOPLE REPUBLIC OF CHINA
ICS 33.120.10
L 26
Copper-clad aluminum wire
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ISSUED ON: DECEMBER 31, 2012
IMPLEMENTED ON: JUNE 01, 2013
Issued by: General Administration of Quality Supervision, Inspection and Quarantine;
Standardization Administration of the PEOPLE Republic of China.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative references ... 4
3 Classification and models ... 4
4 Requirements ... 5
5 Test methods ... 8
6 Inspection rules ... 11
7 Packaging, marking, transportation and storage ... 13
8 Contents of order contract ... 14
Appendix A (Normative) Metallographic microscopy ... 16
Appendix B (Normative) Tensile strength and elongation at break test ... 18 Copper-clad aluminum wire
1 Scope
This Standard specifies the product classification, model, requirements, test methods, inspection rules, packaging, marking, transportation and storage of copper-clad aluminum wire.
This Standard applies to bare round copper-clad aluminum wires for electricians. The typical use of the copper-clad aluminum wire is the inner conductor of the radio frequency coaxial cable; other uses are also available.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies to this document. For undated references, the latest edition (including any amendment) applies to this document.
GB/T 3048.2-2007, Test methods for electrical properties of electric cables and wires - Part 2: Test of electrical resistivity of metallic materials (IEC 60468:1974, MOD) GB/T 4909.2, Test methods for bare wires - Part 2: Measurement of dimensions GB/T 4909.5, Test methods for bare wires - Part 5: Bend test - Reverse bend test IEC 61196-1-310, Coaxial communication cables - Part 1-310 Mechanical test methods - Test for torsion characteristics of copper-clad metals
3 Classification and models
3.1 Classification
Copper-clad aluminum wires are divided into the following six categories according to the copper layer volume ratio (10%, 15%, 20%) and the soft or hard state (soft state A, hard state H):
10A ?€? soft copper-clad aluminum wire with a copper layer volume ratio of 10%; 10H ?€? hard copper-clad aluminum wire with a copper layer volume ratio of 10%; 15A ?€? soft copper-clad aluminum wire with a copper layer volume ratio of 15%; 15H ?€? hard copper-clad aluminum wire with a copper layer volume ratio of 15%; 20A ?€? soft copper-clad aluminum wire with a copper layer volume ratio of 20%; 20H ?€? hard copper-clad aluminum wire with a copper layer volume ratio of 20%. 3.2 Model and marker
3.2.1 Model
The model of copper-clad aluminum wire consists of type code (CCA), category code (10A, 10H, 15A, 15H, 20A, 20H) and nominal diameter (mm).
Represented as follows:
3.2.2 Product marker
The product marker consists of name, model and the number of this Standard. Example: soft copper-clad aluminum wire with a nominal diameter of 2.50 mm and a copper layer volume ratio of 15% is represented as: copper-clad aluminum wire CCA- 15A-2.50 GB/T 29197-2012
4 Requirements
4.1 Appearance
The surface of the copper-clad aluminum wire shall be smooth and round, and shall be free of dents, scratches, bamboo joints, bubbles, cracks, exposed aluminum, and any defects that affect use.
4.2 Diameter
The diameter of the copper-clad aluminum wire shall meet the requirements in Table 1. 4.3 Copper layer thickness
The copper layer thickness of the copper-clad aluminum wire shall meet the following requirements:
a) For 10A and 10H copper-clad aluminum wires, the thinnest thickness shall not be less than 1.75% of the nominal diameter;
b) For 15A and 15H copper-clad aluminum wires, the thinnest thickness shall not be less than 2.5% of the nominal diameter;
c) For 20A and 20H copper-clad aluminum wires, the thinnest thickness shall not be less than 3.5% of the nominal diameter.
4.4 Copper layer volume ratio
The copper layer volume ratio of the copper-clad aluminum wire shall meet the following requirements:
a) For 10A and 10H copper-clad aluminum wires, the copper layer volume ratio shall be no less than 8% and no more than 12%;
b) For 15A and 15H copper-clad aluminum wires, the copper layer volume ratio shall be no less than 13% and no more than 17%;
c) For 20A and 20H copper-clad aluminum wires, the copper layer volume ratio shall be no less than 18% and no more than 22%.
4.5 DC resistivity
The DC resistivity of the copper-clad aluminum wire at 20??C shall meet the requirements in Table 2.
mm, visually inspect the appearance quality; for copper-clad aluminum wires with a nominal diameter less than 1.50 mm, use a magnifying glass with a magnification of no more than 10 times to inspect the appearance quality. When necessary, use other appropriate methods agreed upon by the manufacturer and the user to check. 5.2 Diameter
The diameter of the copper-clad aluminum wire shall be measured according to the provisions of GB/T 4909.2.
5.3 Copper layer thickness
For copper-clad aluminum wires with a nominal diameter greater than or equal to 2.00 mm, use metallographic sandpaper to grind and polish the cross-section, to meet the mirror surface requirements; use a reading microscope greater than 20 times to measure the thinnest copper layer thickness.
For copper-clad aluminum wires with a nominal diameter of less than 2.00 mm, the thinnest copper layer thickness shall be measured in accordance with the provisions of Appendix A.
5.4 Copper layer volume ratio
Measure the diameter of copper-clad aluminum wire according to the provisions of 5.2. According to the provisions of 5.3, measure the copper layer thickness at the four mutually perpendicular positions shown in Figure 1, which shall include the thinnest part of the copper layer.
Use the average of the measurements at four locations to calculate the average thickness of the copper layer.
Figure 1 ?€? Measurement of average copper layer thickness
Calculate the copper layer volume ratio according to Formula (1):
Where:
r ?€? copper layer volume ratio;
d ?€? diameter of the copper-clad aluminum wire, in millimeters (mm);
t ?€? average copper layer thickness, in millimeters (mm).
5.5 DC resistivity
The DC resistivity of the copper-clad aluminum wire is calculated by measuring the DC resistance.
DC resistance measurement shall be carried out according to the provisions of GB/T 3048.2-2007. When the test temperature is not 20 ??C, it shall be corrected to the resistance value at 20 ??C according to Formula (9) in GB/T 3048.2-2007, where the temperature coefficient of resistance at 20 ??C is 0.004055/??C (10A, 10H), 0.004049/??C (15A, 15H), 0.004042/??C (20A, 20H).
The DC resistivity shall be calculated according to Formula (2):
Where:
?? ?€? DC resistivity, in ohm square millimeters per meter (????mm2/m);
R ?€? DC resistance, in ohms (??);
S ?€? cross-sectional area, in square millimeters (mm2);
l ?€? length, in meters (m).
5.6 Tensile strength and elongation at break
The tensile strength and elongation at break of copper-clad aluminum wire shall be tested according to the provisions of Appendix B. When the elongation at break is less than the specified value and the break point appears within 25 mm from the chuck of the testing machine or the gauge length of the extensometer, the data is invalid and the test shall be repeated.
5.7 Torsion
The torsion test of the copper-clad aluminum wire shall be carried out in accordance with the provisions of IEC 61196-1-310.
5.8 Reverse bend
The reverse bend test of the copper-clad aluminum wire shall be carried out in accordance with the provisions of GB/T 4909.5, and the sample shall be repeatedly bent until the sample breaks. After the test, check whether there is delamination between the copper layer and the aluminum core.
5.9 Density
Measure the diameter and length of the copper-clad aluminum wire according to the provisions of GB/T 4909.2. When the nominal diameter is greater than or equal to 1.5 mm, the length of the sample shall not be less than 1 000 mm; when the nominal diameter is less than 1.5 mm, the length of the sample shall not be less than 4 000 mm. Use a balance with an accuracy of not less than 1 mg to measure its mass, and then calculate the density according to Formula (3):
Where:
D ?€? density, in grams per cubic centimeter (g/cm3);
W ?€? mass, in grams (g);
d ?€? diameter, in millimeters (mm);
l ?€? length, in millimeters (mm).
5.10 Joints
Visually inspect the joints and their markers, and use a weighing instrument with an accuracy of not less than 0.1 kg to measure the weight between adjacent joints. The diameter of the joint shall be measured according to the provisions of 5.2, and the tensile strength and elongation at break shall be measured according to the provisions of 5.6. When sampling, the joint shall be located in the middle of the sample as much as possible.
6 Inspection rules
6.1 General
Finished copper-clad aluminum wires can only leave the factory after passing the inspection of the quality inspection department of the manufacturer. Each batch of products leaving the factory shall be accompanied by an exit-factory inspection certificate. Inspection is divided into exit-factory inspection and type inspection. The samples for type inspection shall be randomly selected from the inspection batches that have passed the exit-factory inspection, and the sample size shall be 3 reels (shafts). Samples shall be taken from each sample unit (reel or shaft).
6.3.3 Type inspection cycle
In any of the following cases, type inspection shall be carried out:
a) Inspection and identification of new products or old products which are transferred to the factory;
b) After formal production, when raw materials, formulations or process conditions are changed;
c) During normal production, once a year;
d) When the product is put back on production after a long time of suspension; e) When the exit-factory inspection results are significantly different from the normal production inspection results;
f) When proposed by the national quality supervision and inspection agency. 6.3.4 Acceptance and failure of type inspection
When the items specified in Table 6 are all qualified, the type inspection is qualified. When the type inspection is unqualified, the sampling shall be doubled for re-inspection. If it is still unqualified, judge it as unqualified. Then, the product delivery shall be stopped, the reasons shall be analyzed at the same time, and corrective measures shall be taken to eliminate the unqualified reasons. The exit-factory inspection can only be resumed after the new type inspection is qualified.
7 Packaging, marking, transportation and storage
7.1 Packaging
Copper-clad aluminum wires shall be supplied in reels (shafts), neatly coiled, and properly packaged to prevent contamination, oxidation, and damage.
Copper-clad aluminum wire packaging shall be accompanied by an exit-factory inspection certificate of the product. Packaging materials shall meet environmental protection requirements, and there shall be corresponding marking on the outer packaging.
7.2 Marking
Each reel (shaft) of copper-clad aluminum wire shall be attached with a label or a tag indicating the following:
a) name or trademark of the manufacturer;
b) model;
c) production date;
d) gross weight and net weight;
e) product batch number;
f) inspector?€?s mark;
g) number of this Standard;
h) joint information;
i) others.
7.3 Transportation
During transportation, copper-clad aluminum wires shall be protected from moisture and corrosion, to prevent damage caused during loading, unloading, lifting, stacking and transportation.
7.4 Storage
Copper-clad aluminum wires shall be properly stored in a warehouse that is dry and ventilated (humidity not greater than 65%), rainproof, waterproof, and does not contain acid-base substances or harmful gases.
8 Contents of order contract
The order contract shall at least include the following:
a) product name, model and specification;
b) number of this Standard;
c) quantity (or weight);
d) joint requirements;
e) packaging requirements;
f) inspection requirements and inspection locations;
Appendix A
(Normative)
Metallographic microscopy
A.1 Test principle
In this test, after grinding and polishing the sample of the copper-clad aluminum wire to make the cross-section meet the requirements of the mirror surface, use a metallographic microscope to measure the thinnest copper layer thickness of the copper-clad aluminum wire with a nominal diameter of less than 2.00 mm. A.2 Test device
Use a metallographic microscope with a magnification of not less than 100 times and a scale on the eyepiece.
A.3 Sample preparation
A.3.1 Sample cutting
Cut 6 samples with a length of about 15 mm from the extracted copper-clad aluminum wire sample. When cutting, the cross-sectional deformation of the wire shall be minimized.
A.3.2 Sample mounting
Stick the sample parallel to the tape with a width of about 10 mm at intervals of 2 mm ~ 3 mm. Stick the tape together with the sample on an aluminum rod with a diameter of about 5 mm and a length of about 15 mm. Stand the aluminum rod and sample vertically in an aluminum tube or plastic aluminum tube with a diameter of about 15 mm and a height of about 15 mm. Fill the gap between the two with epoxy resin, and set it aside after curing; alternatively, use bakelite powder on the mosaic machine for later use.
A.3.3 Grinding, polishing and etching of samples
Grind the mounted sample perpendicular to metallographic sandpaper. Grind on the coarser sandpaper first; when the direction of the wear marks is consistent, change to the finer sandpaper. Every time the sandpaper is replaced, the dust from the previous grinding must be removed, and the grinding direction of the sample must be turned 90??. The grades of the sandpaper used are from coarse to fine: No. 280, No. 400, No. 800, No. 1 000 and No. 1 500.
Appendix B
(Normative)
Tensile strength and elongation at break test
B.1 Test principle
In this test, the tensile strength and elongation at break of the copper-clad aluminum wire are determined by applying a tensile force to a section of the sample. Unless otherwise specified, this test shall be carried out at an ambient temperature of 10 ??C ~ 35 ??C.
B.2 Test device
The indication error of the force measuring system of the testing machine shall not be greater than 1%.
An extensometer with a gauge length greater than 250 mm or other suitable elongation measuring device shall be used. The device shall have a scale with a resolution better than 0.25 mm.
B.3 Sample
The original gauge length (L0) of the sample is 250 mm, and the total length of the sample is about 300 mm.
The sample shall be straightened manually or by other suitable means.
B.4 Test procedure
B.4.1 Determination of the original cross-sectional area (S0)
Measure the diameter of the copper-clad aluminum wire according to the provisions of GB/T 4909.2, and calculate the original cross-sectional area according to Formula (B.1): Where:
S0 ?€? original cross-sectional area, in square millimeters (mm2);
d ?€? diameter, in millimeters (mm).

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