The core wires (2) configuring the steel cord (1) have a diameter (d) of less than 0.45 mm and the interval (Gd) between the core wires (2) is less than 20 µm.

A core wire, for which the free coil diameter (D) of the core wire (2) is at least 750 times the wire diameter (d) of the core wire (2), is used for said core wires (2).

A method and device for the production of core yarn (63), whereby a core yarn (12) is brought to a fibre slubbing (8) which has been refined in a drafting system before said slubbing is reinforced by twisting.

The switches (16) and lights (10) are connected by twin core wires (18).

The process may be specifically adapted for particular welding wires, and may be particularly well suited for use with cored wires.

Feedstock having the composition may be in the form of a cored wire or wires, a solid wire or wires, or a powder.

The cable is made from clusters of single solid core wires, made from purest, oxygen free copper.