Copper stranded wire is a kind of wire made of copper wire by winding each other. Generally having an insulating outer layer.
distinguish
First of all, look at the appearance of copper stranded wires   the purchase of copper stranded wires needs to be observed from the appearance. Generally, good copper stranded wires have bright appearance, no obvious damage and scratch, and no obvious discoloration caused by oxidation reaction. The outer color is relatively uniform, without black spots and cracks, and the distance is uniform and regular. Meeting the above standards is a good choice of copper stranded wire.   second: look at the specifications and models of copper strands   the selection of copper strands needs to observe the dimensions and specifications of the wire. Generally, the drawing of copper strands should be within the specified range and should not exceed the process standards, otherwise it will be regarded as invalid strands. The single wires constituting the stranded wires must meet the characteristics of uniformity and orderliness and conform to the process rules.   again: look at the structure and composition of copper stranded wires   when purchasing copper stranded wires, we should also observe the distribution and composition of the stranded wires to see if there are short wires, missing wires, loose strands and overlapping strands. Generally, these can be observed with naked eyes. We need to carefully observe and inspect the quality of copper stranded wires. We can't choose unqualified products to produce wires and cables, which will cause serious safety accidents.   finally: look at the welding process of copper strand   when purchasing copper strand, you should also pay attention to whether the welding process is reliable, whether the welded interface is neat, and whether there are uneven lines. The welded interface shall be maintained in order, leveled and rounded, and the diameter of the welding head shall not exceed 0.2 mm; The welding of two adjacent copper strands shall be kept at a certain distance and the interval shall be even.
2、 Model reference
The copper stranded wire is generally divided into hard copper stranded wire and soft copper stranded wire, as well as whether the copper stranded wire is one strand or multiple strands.