Heat-releasing welding flux for iron-base copper-clad steel grounding grid

Abstract

The invention provides heat-releasing welding flux for an iron-base copper-clad steel grounding grid. The heat-releasing welding flux comprises, by weight, 0-15 parts of Fe2O3, 21-55 parts of Fe3O4, 15-22 parts of metal aluminum powder, 5-10 parts of metal chromium powder, 4.5-7 parts of CaF2 powder, 2-3 parts of metal tin powder, 0.1-2.5 parts of metal nickel powder, 0-15 parts of metal iron powder, 1.1-2.5 parts of calcium silicon powder and 0.5-3.5 parts of iron alloy powder. According to the heat-releasing welding flux, the iron oxide and the aluminum powder serve as basic materials, and cost is greatly reduced; the fluidity of molten metal can be improved through the CaF2 powder, and gas is easily discharged. The metal chromium powder is added, a stable and compact oxide film can be generated by the chromium, and the corrosion resistance of metal can be remarkably improved by the fact that the chromium is added into the metal such as the iron.

Description

technical field [0001] The invention relates to the field of metal welding, in particular to an exothermic flux for an iron-based copper-clad steel grounding grid. Background technique [0002] The power grid grounding system can ensure the safe operation of the power system and electrical equipment, and at the same time ensure the personal safety of the power system operators and other personnel, so the design of the grounding system is a very important link in the construction of power engineering. In the field of power grid grounding, people pay more and more attention to the reliability of the grounding grid, and many grounding projects have gradually adopted copper-clad steel with better corrosion resistance and lower cost. [0003] Exothermic welding is a simple, high-efficiency, high-quality metal joining process. It uses the chemical reaction heat of metal compounds as a heat source, and works through superheated (reduced) molten metal, direct or indirect heating, an...

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Problems solved by technology

[0007] Another example is an application for an invention patent with the application number CN201110116020.1 and the title of the invention is "A Copper-clad Steel / Copper Grounding Grid Exothermic Flux", which involves an exothermic flux, which is composed of copper oxide, metallic copper powder, and metallic aluminum powder. , red iron oxide, black iron oxide, silicon-calcium powder, and fluorite powder, wherein the weight percentage of copper oxide component is 20-36%, and the weight percentage of copper component is 20-24%; the flux still contains more Copper powder and copper oxide, the cost is higher

Moreover, due to the residual metal aluminum in the welded joint, the melting point temperature of the welded joint is reduced; the welded joint contains impurity elements such as hydrogen, oxygen, sulfur, and phosphorus, which are prone to thermal cracks and pores, reducing the stability of the joint

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