HIGH-EFFICIENT ENERGY-SAVING AND SURFACING LAYER WELL-FORMING SELF-SHIELDED FLUX-CORED WLEDING WIRE AND MANUFACTURE METHOD THEREOF

摘要

The present invention discloses a high-efficient energy-saving and surfacing layer well-forming self-shielded flux-cored welding wire. A low-carbon steel strip is used as an outer cover, and a flux core comprises the following components in percentage by mass: 42-60% high carbon ferrochrome with a particle size of 80 meshes, 10-18% ferrosilicon, 16-25% ferroboron, 2-8% rare earth silicon, 2-8% graphite, 1-4% aluminum magnesium alloy, 2-5% manganese powder and the balance of iron powder, wherein the graphite, the aluminum magnesium alloy and the manganese powder are all added with two particle sizes including 60 meshes and 200 meshes, and the weight of the flux core powder accounts for 49-53% of the total weight of the welding wire. According to the welding wire provided by the present invention, since adding the flux core components with different particle sizes, good welding technological performance is ensured; and through adding B, Si and other self-fluxing alloy elements simultaneously in the flux core, the fusing point of the welding wire is effectively lowered, the welding process window is expanded, the surfacing efficiency is improved, the high-efficient and energy-saving effect is realized, the surface tension of a surfacing welding bead is effectively lowered, and the forming of the surfacing welding bead is effectively improved.