Copper-coated solid wire
A mild or low-alloy welding wire with a thin copper coating to improve electrical contact and corrosion protection.
Physico-chemical mechanism of action
A solid wire consists of a core material such as steel or nickel, coated with a thin layer of copper. This copper layer improves electrical conductivity and protects the wire from corrosion.
Metallurgical relevance & risks during welding
The copper layer can flow off or fuse at high temperatures, which can lead to uneven stress fields. This can cause cracks and deformations in the weld. Furthermore, copper runoff can affect the structure of the weld material, leading to a reduction in mechanical properties.
Workshop practice & instructions
Use copper-coated solid wires in environments with high corrosion potential or for weld joints that require high electrical conductivity. Make sure the wire is not overheated to ensure the copper coating is maintained. If necessary, a copper-coated solid wire can be coated with an additional corrosion Corrosion Inhibitor such as silicon or titanium.