distinguish
First of all, to see the appearance of the copper stranded wire, the purchase of the copper stranded wire needs to start from the appearance. Generally, the good copper stranded wire has a relatively bright appearance, without obvious damage and scratches, and without obvious discoloration caused by oxidation reaction. The outer color is relatively uniform, without black spots and cracks, and the distance is uniform and regular. Conforming to the above standards is a good choice of copper stranded wire. Secondly, the selection of the specification and model of the copper stranded wire needs to observe the scale and specification of the wire. Generally, the drawing of the copper stranded wire should be within the specified range and should not exceed the process standard, otherwise it will be regarded as an invalid stranded wire. The single wire forming the stranded wire must meet the uniform and tidy characteristics and comply with the process rules. Third, the selection and purchase of copper stranded wire, which is composed of copper stranded wire structure, should also observe the distribution and composition of the stranded wire, and see whether there are short wires, missing wires, loose strands, and overlapping strands. Generally, these can be observed with the naked eye. We need to carefully observe and inspect the quality of the copper stranded wire. Unqualified products cannot be selected to produce wires and cables, which will cause serious safety accidents. Finally, when looking at the welding process of copper stranded wire, we should also pay attention to whether the welding process is reliable, whether the welding interface is neat, and whether there are uneven lines. The welding interface shall be maintained in order, leveled, rounded and not tied. The diameter of the welding head shall not exceed 0.2mm in general; The welding of two adjacent copper strands should be kept at a certain distance and the spacing should be uniform.
Model reference
Generally, copper stranded wire can be divided into hard copper stranded wire and soft copper stranded wire, and can also be divided into one strand or multiple strands.