How to distinguish the quality of copper, how to distinguish the quality of copper wire

Copper is a metal chemical element, but also a trace element necessary for the human body, copper is also one of the earliest metals discovered by human beings, is a metal widely used by human beings, belongs to heavy metals.

Copper mainly depends on his color, red copper, red copper is good copper. There is also brass, which is lighter in color. There is also a zinc plating on the copper, some are tin-plated, white, and there is an inferior copper, the copper has impurities in it, and it is broken into two pieces with a bend by hand, and there are black impurities in it.

Copper's *** bad identification:

1. Generally, it is necessary to observe the appearance of copper to judge, first of all, to look at the color of copper, according to the different types of copper purchased to make different color judgments, 1) For copper, the red copper with red color is generally good copper.

2) For brass, it is generally better to be light-colored.

3) There are also copper galvanized or tinned plating, and the color is white.

2. For inferior copper, there are impurities in the copper, and the strips will be broken into two when bent by hand, and the black impurities in it are inferior copper.

3. Touch the surface of the copper with your hands to see if it is smooth and clean, and see if there are defects such as sand hole, oxidation, and cracking. It can also be scraped on it with sharp objects, and generally good copper is processed from pure copper, which will have better extensibility. So a good quality copper surface will have a deep line.

For the copper pipe, after the copper pipe is scratched, if it is the same as the outer wall, it indicates that the overall quality of the copper pipe fitting is relatively high. However, if the color or other aspects are different, it is very likely that some substances like iron will be added to it.

4. The copper that is generally processed and formed is mainly divided into hard, semi-hard, and soft three, and the flexibility of different forms is also different, which can generally be determined by bending copper, and high-quality copper is very easy to bend off, but if it is difficult to bend or there will be cracks after bending, it indicates that the quality of copper parts is not too good.

1. It depends on it. See if there is a quality system certification; See whether the certificate is standardized; See whether there is a factory name, factory address, inspection seal, and production date; Check to see if the wire is printed.

There are trademarks, specifications, voltages, etc. Also look at the cross-section of the wire copper core, the color of the high-grade copper is bright, the color is soft, and the copper core is yellow and reddish, indicating that the quality of the copper used is better, and the white in the yellow is the reaction of the low-quality copper. Otherwise, it is defective.

2. Try. You can take a wire head and bend it repeatedly by hand, where it feels soft, has good fatigue strength, plastic or rubber feels elastic and there is no crack on the wire insulator is the best product.

3. Intercept a section of the insulation layer to see if its core is located in the middle of the insulation layer. Not centered is due to the process is not high caused by the core phenomenon, in the use of small power can also be peaceful, once the power consumption, the thinner side is likely to be broken down by the current.

4. Be sure to see whether the length and core thickness are done with hands and feet. In the relevant standards, the error of the length of the wire can not exceed 5%, and the cross-sectional wire diameter can not exceed 0 02%, but there are a large number of short catties in the length of the market, and there is fraud on the cross-section (such as the line with a cross-section of 6 square millimeters, but in fact it is only 4 5 square millimeters thick).

The quality of copper wire is mainly based on copper content, which is required to be indistinguishable from the human eye, and generally requires smooth surface, good luster, no fine cracks, and soft inside (relatively speaking, containing impurities). The hardness of lattice copper wire is related to the heat treatment method during manufacturing, for example, if the same copper wire is 16 square millimeters, if the bare copper wire used as an overhead is hard, the hardness is higher to increase the mechanical strength and reduce it.

Summary. 4 kinds, namely copper, brass, bronze, and cupro; Copper is relatively the most expensive (about 70 yuan per kilogram), and whether this is good or not depends on its usefulness and value maximization. The difference between different materials in different positions.

There are several types of copper, which copper is the best, and how to distinguish them.

4 kinds, namely copper, brass, bronze, and cupro; Copper is relatively the most expensive (about 70 yuan per kilogram), and whether this is good or not depends on its usefulness and value maximization. The difference between different materials in different positions.

Look at the color. Cupronickel is a copper-based alloy with nickel as the main added element, which is silvery-white and has a metallic luster, hence the name cupronickel.

1. Look at the color: Identify the copper can look at the color, pure copper is purple red, brass.

Is pale yellow, bronze close to white, even with a file.

The same is true for filing and removing the surface. Fake copper is generally dyed and packaged, and the surface will be exposed after being broken off with a file.

2. Listen to the sound: Identify the copper can listen to the sound, gently tap the surface of the copper, the sound of the real copper is low, it will make a "buzzing" sound, and the sound disappears slowly. The knocking sound of the fake copper is sharp and disappears relatively quickly.

3. Use magnets.

Copper can be identified with magnets, which are non-magnetic and therefore do not have an adsorption force when the magnet is in close proximity. Fake copper contains an iron substance that is quickly attracted when the magnet is approached.