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What are the reasons for the blackening of the coil?

What are the reasons for the blackening of the coil?

Copper wire annealing refers to a metal heat treatment in which copper wire is slowly heated to a certain high temperature and maintained for a period of time, then cooled at a corresponding rate. Copper wire annealing can effectively reduce hardness, improve machinability, eliminate residual stress, stabilize size, and reduce deformation and crack tendency; Refine grain size, adjust structure, and eliminate structural defects. However, the manufacturer of Beijing Kexun Hongsheng High Temperature Line believes that once the temperature exceeds 50 ℃ during the production process, the required extraction time is insufficient, the SO2 content is high, and the protective gas is impure, which will cause insufficient annealing. After a period of time, the copper wire will be prone to blackening.

28

2022

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07

Method for inspection of three-layer insulation wires

Method for inspection of three-layer insulation wires

1. Winding test of three-layer insulation wire: Take a sample with a length of at least about 305mm and wind it 10 times on a circular rod equivalent to the outer diameter of the sample at a speed of 1-3 turns/second. The tension borne by the wire during winding is just enough to make the wire in close contact with the circular rod, and it should be noted that there should be no elongation of the sample. After winding, the sample should be visually inspected and there should be no deep or conductor cracks in the insulation layer.

10

2022

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01

Knowledge about three-layer insulated wires

Knowledge about three-layer insulated wires

(1) Storage and usage environment: The storage conditions for three-layer insulated wires are: ambient temperature is -25-30 ° C, relative humidity is 5% -75%, and storage period is one year. It is prohibited to store three-layer insulated wires in high temperature, high humidity, direct sunlight, and dusty environments. For three-layer insulated wires that have exceeded their storage period, they must undergo insulation breakdown voltage, withstand voltage, and windability tests again before use.

12

2021

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11

What is a high-temperature twisted square wire

What is a high-temperature twisted square wire

1. Make the coil slot full and pass a larger current to avoid overheating of electronic products, making it more suitable for high current loads.

12

2021

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11

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