Laser welding is alloy, not steel wire, there will probably save a bad rust. Some laser welding on the surface coated with a thin layer of rust-proof material, but not too thick coating of rust layer, or will affect the welding quality, because this rust layer is equivalent to impurities in the welding process. In particular, the mirror mold Cast Iron Welding Rod, even if it is anti-rust coating layer. If the wire rust, surface rust with sandpaper to fight to the light, you can use without affecting the welding quality.
Copper wire copper wire rust rust for many reasons, such as the thick mist workshop, wire cleaning is not complete, poor coating quality, process execution is not strict, such as hand or glove contact with oil and other wire products, and packaging poor quality, lack of corrosion based on the requirements of post-treatment processes and so on. However, the copper wire is not the root cause of rust.
Copper wire is the root cause of rust electrochemical corrosion. Departure from the principles of electrochemistry, the use of Welding Wires layer of corrosion protection as the gas layer is unreasonable. Because copper is corrosion of the iron cathodic protection must be dense without holes in order to achieve the purpose of corrosion. However, gas-shielded copper wire, copper content in restricted circumstances, it is impossible to obtain dense non-porous layer of copper.