The tube of solid welding wire is solid, and the tube of flux-cored welding wire has a flux core, which is used to stabilize the arc, improve the operating performance, and play a protective role. Compared with solid wire, flux-cored wire has less spatter, and continuous use will not block the torch nozzle. The performance of flux-cored wire is better than that of solid wire, and the deposition efficiency of flux-cored wire is slightly lower than that of solid wire, but the deposition rate is much faster than that of solid wire.