Composition and difference of bare copper wire, tinned copper wire, copper-covered aluminum wire

Security cable production often uses bare copper wire, UL1061 electronic wire tinned copper wire, copper-covered aluminum wire, they can be used for braided coaxial cable, shielding sheath wire shielding network. Bare copper wire is a pure copper rod drawn from the UL1007 electronic wire, UL1015 electronic wire, UL1061 electronic wire, UL1571 electronic wire material is single, both inside and outside the copper metal, the past is yellow, and because of the purity of copper, the color is deep and light. In terms of physical properties, the bare copper wire is soft and has excellent electrical conductivity. The process of tinned copper wire is slightly more complicated than that of bare copper wire. The pure copper rod is drawn into wire and then a thin layer of tin is plated on the surface of the copper wire by hot tinning process. The appearance of this thread is silver, because tin is a silver metal. UL1571 electronic wire is soft, good electrical conductivity, compared with bare copper wire, its corrosion resistance, oxidation resistance is stronger, can greatly extend the service life of weak cable. Copper-covered aluminum wire using cladding welding manufacturing technology, the copper strip is covered in the outer surface of the aluminum rod core wire, and the copper layer and the core wire form a solid metallurgical bond between the atoms, so that two different metal materials combined into an inseparable whole, can be processed as a single metal wire drawing and annealing treatment, the drawing process of copper and aluminum in the same proportion to change the diameter, The copper layer volume ratio remains relatively constant. The copper clad aluminum wire is very light in weight and yellow in appearance, but compared with the previous two, the electrical conductivity is much poorer, the flexibility is not enough, it is easy to break, and the corrosion resistance and oxidation resistance are also relatively low. If the copper-clad aluminum production process is not well controlled, then copper-clad aluminum products are likely to become waste products in a short time. The structure diagram of the three wire materials is as follows: bare copper wire and UL1015 electronic wire covered aluminum wire are widely used in braiding shielding nets, due to material differences, resulting in a mixed market for weak current cables. Copper clad aluminum wire and bare copper wire appearance color is the same, at first glance, it is difficult to distinguish, with great confusion. The advantages and disadvantages of various weaving network materials also make the majority of engineering friends confused and unable to identify. Here are some common methods to distinguish bare copper wire, tinned copper wire and copper-covered aluminum wire. The video cable SYV75-5 braided network is used as the test object, and the following methods can be used: 1. Visual inspection. Stripping the video wire outer cover can quickly identify the tinned copper wire from the three wire materials, because only the tinned copper wire is silver, and the other two are yellow. Next, vertically and neatly cut a video wire and see the cross section of the braided net. If it is yellow, it is a bare copper wire; if it is white, it is a copper-covered aluminum wire. The three kinds of wire materials used for weaving nets are then distinguished. 2. Scrape the surface of the video wire braided net with a tool, the tinned copper net appears yellow after scraping, the bare copper net is still yellow, and the copper-covered aluminum net appears white with snowflakes. The same effect can be obtained by rubbing the video wire woven net on the concrete floor. 3. Overtest. Disassemble the video wire weaving net, turn it to one side, close to the flame, if it forms a ball-shaped object after burning, it is copper material; If the metal wire becomes white after burning, and the sagging is broken when touched by hand, it is a copper-clad aluminum net. In addition, weighing with a balance, testing the resistivity of the braided mesh with professional electrical testing equipment, or testing the oxidation resistance of the braided mesh with aging equipment is a good way to test the material of the braided mesh. Through the above introduction, we can find that bare copper wire and tinned copper wire are good materials for braiding shielding nets, and tinned copper wire performs better in terms of oxidation resistance. In terms of cost, due to the high price of tin, the cost of tinned copper wire is higher than that of bare copper wire, and the price of aluminum is very low, so the cost of copper-covered aluminum wire is the lowest, which can occupy the low-end cable market due to its low price advantage. Moreover, copper-clad aluminum braided mesh is difficult to distinguish from bare copper mesh, and it is often shoddy on the market, because the copper-clad aluminum wire has low oxidation resistance and is perishable, resulting in frequent rework of the project, resulting in huge losses. In the high-end cable market, tinned copper wire is the first choice for the production of brand cables