Copper-coated solid wire
An unalloyed or low-alloy welding wire with a thin copper layer that reduces electrical contact resistance and keeps the feed stable in the contact tube.
Physical-Chemical Mechanism of Action
A copper-coated solid wire consists of a core material like steel or nickel, covered with a thin layer of copper. The copper layer improves electrical conductivity and prevents corrosion in the contact tip.
Metallurgical Relevance & Welding Risks
The copper layer can flake off at high temperatures or under heavy mechanical stress, causing increased electrical resistance and possible contact failures. It's important to control coating thickness and the coating process carefully.
Workshop Practice & Actions
Use copper-coated wires in high-corrosion environments or applications requiring high electrical conductivity. Make sure the contact tip is clean and dry before loading the wire. If needed, you can apply an extra anti-corrosion coating.