Quality standard for beam and strand

1, the quality standard of the beam line

l) appearance

After stranding, the surface of the single wire should be smooth and clean, without obvious mechanical damage, and there should be no oxidative discoloration, and there should be no obvious loose strands and back strands. For tin-plated cores, the surface requires uniform color and smoothness, no black spots, uniform tin plating, and no leakage plating.

2) Size

The single wire should be rounded and there should be no obvious straightening. The wire drawing must be within the range specified by the standard. The outer diameter of the wire harness should be within the process requirements.

3) Structure and composition

The beam line must not have roots, roots, loose strands, and the surface of the strands and the beam line can be used as a good product if it is slightly rubbed. The structure and composition must comply with the process regulations.

4) The pitch ratio and beam direction of the beam line should meet the requirements.

5) Welding

One-time bundle conductor, no whole core welding is allowed, but single wire is allowed to weld, the welding head distance is not less than 300mm, the outer diameter of the welding head does not exceed 2 times the absolute value of the tolerance, the strand for the twisted wire is allowed to be welded, and the distance of the welding head is not Less than 1m, the welding head should be lighted and rounded, and the diameter of the welding head should not exceed 0.2mm and below the nominal diameter. The single wire of the sixth type of wire can be twisted, but the hair is not allowed, and the core should be smooth.

6) Loading

The core wire of the conductive wire is neat and flat, and there is no possibility that the waist drum and the core are pressed against each other.

2, the quality standard of the strand

l) appearance

The appearance of the stranded wire shall be smooth and clean, and shall not have triangular mouths, cracks, spots and inclusions. The pitch shall be even and tidy, and there shall be no obvious mechanical damage. The copper stranded conductor shall not have oxidative discoloration and dark spots. For tin-plated wire cores, the color is uniform and bright, and there must be no black spots or leakage plating.

2) Size

The earning amount of the single wire forming the stranded wire must be within the specified range, and the outer diameter of the stranded wire shall comply with the process regulations.

3) Structure and composition of the structure and composition of the stranded wire, and the DC resistance value of the finished product shall comply with the provisions of GB/T3956-1997 cable conductor). Can not lack roots, less strands, broken strands, crushing, the eccentricity of the fan-shaped core compression type can not exceed 10%.

4) Pitch and twisting should meet the process requirements.

5) State, except for hard copper conductors for overhead insulated wires, the remaining copper conductors must be annealed.

6) The multi-layer stranded wire is gradually reduced from the inner to the outer pitch ratio, and the same layer pitch is consistent, and the stranded layers should be opposite.

7) The second type of 5th and 6th kinds of conductors are not allowed to be welded by the whole core. The single wire or strand is allowed to be welded. The diameter of the welded joint should not exceed 2 times the absolute value of the deviation. The outer diameter of the wire bonding head is not greater than the nominal. The diameter of the hole is 0.2mm, and the distance between the welding heads of the same layer or adjacent layers is not less than 300mm.