Ignition powder for copper-clad steel/copper grounding grid exothermic welding

Abstract

An ignition powder for copper-clad steel / copper grounding grid exothermic welding belongs to the metal welding field. The existing ignition powder for exothermic welding has the problems of poor safety, no environmental protection, complex components, high reaction brightness and the like. The ignition powder for exothermic welding comprises the following components by weight percent: 20-70% of copper oxide powder with granularity of 40-80 meshes and 85% of oxidation degree; 0-50% of copper oxide powder with granularity of 200-300 meshes and 99.9% of oxidation degree; 10-15% of aluminium metalpowder with granularity of 200-300 meshes and 99.9% of purity; and 15-35% of magnesium metal powder with granularity of 40-100 meshes and 99.9% of purity. The ignition powder has the advantages of simple components, environmental protection, good safety, even reaction speed, moderate brightness and the like.

Description

technical field [0001] The invention belongs to the field of metal welding, and in particular relates to an ignition agent for exothermic welding of copper-clad steel / copper grounding grid. Background technique [0002] With the steady progress of economic development, the demand for energy is increasing year by year, and the process of power construction is gradually accelerating. The development of power construction is reflected in the dual development of infrastructure construction quantity and quality. [0003] In the field of power grid grounding, people pay more and more attention to the reliability of the grounding grid. The widely used galvanized steel grounding grid has low cost, but poor corrosion resistance. Frequent excavation and maintenance are required in severely corroded areas, which increases subsequent maintenance costs. Therefore, copper or copper-clad steel grounding grids have been gradually replaced in many key projects. Galvanized steel ground grid....

AI Technical Summary

Problems solved by technology

[0007] 4) The reaction speed is moderate and the calorific value is high: the reaction speed is directly related to the calorific value of the reaction. An excessively fast reaction speed causes the rapid expansion of the gas, causing the igniter reactant to be blown away, which is not conducive to heat transfer to the thermite. That is, too fast reaction speed cannot ignite thermite; too slow reaction speed is also difficult to ignite thermite, because the reaction speed is slow and the heat is not concentrated, it is difficult to reach the lower limit temperature of thermite reaction;

[0009] 6) The ignition temperature is low: a lighter is usually used to ignite the ignition agent, and the spark energy of the ignition agent is limited. If the ignition temperature of the oxidant and reducing agent added to the ignition agent is too high, it is difficult to use a lighter rush to ignite