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

A technology of igniter and grounding grid, applied in welding/cutting medium/material, welding medium, welding equipment, etc., can solve the problems of inconcentration of heat, unfavorable heat transfer thermite, slow reaction speed, etc., to avoid The heat is not concentrated, it is beneficial to storage and transportation, and the reaction speed is moderate.

Inactive Publication Date: 2010-02-03
CHINA ELECTRIC POWER RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The composition and weight percentage of the igniter for exothermic welding of copper-clad steel / copper grounding grid are:

[0027] Copper Oxide 1 27%

[0028] Copper oxide 2 28%

[0029] Aluminum powder 10%

[0030] Magnesium powder 35%

[0031] The obtained ignition agent was used to ignite the thermite, and the mass ratio of the ignition agent to the thermite was 1:60. The results are shown in Table 1.

Embodiment 2

[0033] The composition and weight percentage of the igniter for exothermic welding of copper-clad steel / copper grounding grid are:

[0034] Copper Oxide 1 70%

[0035] Copper Oxide 2 0%

[0036] Aluminum powder 12%

[0037] Magnesium powder 18%

[0038] The obtained ignition agent was used to ignite the thermite, and the mass ratio of the ignition agent to the thermite was 1:60. The results are shown in Table 1.

Embodiment 3

[0040] The composition and weight percentage of the igniter for exothermic welding of copper-clad steel / copper grounding grid are:

[0041] Copper Oxide 1 20%

[0042] Copper Oxide 2 50%

[0043] Aluminum powder 15%

[0044] Magnesium powder 15%

[0045] The obtained ignition agent was used to ignite the thermite, and the mass ratio of the ignition agent to the thermite was 1:65. The results are shown in Table 1.

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PUM

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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....

Claims

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Application Information

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IPC IPC(8): B23K35/34
Inventor 韩钰聂京凯马光陈玉成李现兵陈新徐德录王立全
Owner CHINA ELECTRIC POWER RES INST
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