Iron-plated tips may feature a layer of nickel between the copper core and the iron surface. A nickel-chrome outer plating may be used further back from the very tip, as solder does not stick well to this material: this avoids solder wetting parts of the tip where it would be unwanted.
Iron-plated tips may feature a layer of nickel between the copper core and the iron surface. A nickel-chrome outer plating may be used further back from the very tip as solder does not stick well to this material: this avoids solder wetting parts of th,e tip where it would be unwanted.