Flux-cored welding rod for surfacing repair

The invention relates to the technical field of welding materials, in particular to a flux-cored welding rod for surfacing repair. Comprising a steel strip, a first flux-cored layer and a second flux-cored layer, the first flux-cored layer and the second flux-cored layer have the same components and are prepared from the following raw materials in percentage by mass: 25-35% of high-carbon ferro-chrome; 5%-10% of molybdenum powder; 1%-5% of ferrovanadium; 9%-15% of niobium powder; 5%-7% of manganese powder and 3%-4% of aluminum powder; the sum of all the components is 100%. The particle size of the first flux-cored layer is larger than that of the second flux-cored layer; the invention aims to solve the technical problem of how to ensure high hardness and high toughness of a surfacing layer. 本发明涉及焊接材料技术领域，具体涉及一种堆焊修复用药芯焊条；包括钢带及包裹于钢带内部的第一药芯层、第二药芯层；第一药芯层和第二药芯层的成分相同，第一药芯层和第二药芯层由以下质量百分比的原料组成：高碳铬铁25％-35％；钼粉5％～10％；钒铁1％～5％；铌粉9％～15％；锰粉5％-7％，铝粉3％-4％；铁粉余量，各组分之和为100％；第一药芯层的粒径大于第二药芯层的粒径；本发明旨在解决如何保证堆焊层的高硬度与高韧性的技术问题。