Coating welding wire and preparation method thereof

The invention discloses a coating welding wire and a preparation method thereof, which relate to the welding wire technology. The surface coating quantity of the coating welding wire of the invention is between 0.05 and 0.35 g/m , the coating structure is compact, the combination of the coating structure and a welding wire base body is firm, the coating expulsion rate in a welding process is smaller than 2.0 percent, and the surface roughness of the welding wire is limited between 0.2 and 5 mum. The welding wire of the invention has the functions of abrasion resistance, activation, rust prevention, arc stabilization and the like, the contact of the welding wire and a conductive nozzle during the welding is stable, the welding splashing is small, the coating expulsion amount is small, the welding electric arch is stable, the wire feeding stability is good, and the welding seam forming effect is good. At the same time, the pollution is little in the welding wire producing process, thepollution discharge amount