The invention provides a flux-cored wire for resurfacing
welding of a spiral
reamer of a vacuum extruder, belongs to the field of
welding materials and aims at solving the problem of prolonging of the spiral
reamer of the vacuum extruder. The flux-cored wire for resurfacing
welding of the spiral
reamer, which is provided by the invention, comprises
carbon steel strip-coated
metal powder and a small amount of mineral
powder. The added power comprises the following substances in percentage by
mass: 20-35 percent of
niobium carbide, 10-15 percent of ferroboron, 2-5 percent of
ferromolybdenum, 5-8 percent of
ferromanganese, 2-5 percent of silicoferrite, 2-4 percent of
ferrotitanium, 1-3 percent of aedelforsite, 1-3 percent of
fluorite (CaF2), 2-4 percent of
quartz (SiO2), 1-3 percent of zirconite (ZrO2), 1-3 percent of
feldspar, 5-8 percent of natural ruffle (TiO2) and the balance of reduced
iron powder. Compared with the prior art, the invention has the advantages of high
hardness of a resurfacing welding layer, strong
wear resistance, fewer welding slags and no need of cleaning the slags or adding protective gases during welding.