Exothermic welding powder for welding novel grounding grid materials

A grounding grid and thermite welding technology, which is applied in the direction of thermite welding equipment, welding/cutting medium/material, welding medium, etc., can solve problems such as air holes, slag inclusions, and unfavorable development of grounding systems in power engineering

Active Publication Date: 2014-09-17
STATE GRID CORP OF CHINA +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, defects such as pores, slag inclusions, and hot cracks are likely to occur when the existing thermite welding powder welds new grounding grid materials. The quality of the welding joints made by for...

Method used

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  • Exothermic welding powder for welding novel grounding grid materials
  • Exothermic welding powder for welding novel grounding grid materials
  • Exothermic welding powder for welding novel grounding grid materials

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] A thermite welding powder for novel grounding grid materials, consisting of the following substances by weight percentage:

[0019]

[0020] Among them, the oxidation degree of copper oxide is 85%, and the particle size is 30 mesh; the purity of metal aluminum powder is ≥98%, and the particle size is 200 mesh; the purity of metal copper powder is ≥99.5%, and the particle size is 200 mesh; the phosphorus content of copper-phosphorus alloy is 14 %, particle size is 100 mesh; metal tin powder purity ≥ 98.5%, particle size 300 mesh; fluorite powder purity ≥ 98.5%, particle size 200 mesh; borax purity ≥ 95%, particle size 100 mesh; the alloy powder particle size ≥ 300 The alloy powder components and weight fractions are Ca: 10%, Si: 45%, Ba: 30%, and the rest are impurities.

Embodiment 2

[0022] A thermite welding powder for novel grounding grid materials, consisting of the following substances by weight percentage:

[0023]

[0024] Among them, the oxidation degree of copper oxide is 85%, and the particle size is 200 mesh; the purity of metal aluminum powder is ≥98%, and the particle size is 30 mesh; the purity of metal copper powder is ≥99.5%, and the particle size is 30 mesh; the phosphorus content of copper-phosphorus alloy is ≥14 %, the particle size is 300 mesh; metal tin powder purity ≥ 98.5%, particle size 300 mesh; fluorite powder purity ≥ 98.5%, particle size 100 mesh; borax purity ≥ 95%, particle size 300 mesh; the alloy powder particle size 100 The alloy powder components and weight fractions are Ca: 10%, Si: 45%, Ba: 30%, and the rest are impurities.

Embodiment 3

[0026] A thermite welding powder for novel grounding grid materials, consisting of the following substances by weight percentage:

[0027]

[0028] Among them, the oxidation degree of copper oxide is 85%, and the particle size is 150 mesh; the purity of metal aluminum powder is ≥98%, and the particle size is 150 mesh; the purity of metal copper powder is ≥99.5%, and the particle size is 130 mesh; the phosphorus content of copper-phosphorus alloy is 14 %, particle size is 260 mesh; metal tin powder purity ≥ 98.5%, particle size 280 mesh; fluorite powder purity ≥ 98.5%, particle size 1800 mesh; borax purity ≥ 95%, particle size 200 mesh; The alloy powder components and weight fractions are Ca: 10%, Si: 45%, Ba: 30%, and the rest are impurities.

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Abstract

The invention discloses exothermic welding powder for welding novel grounding grid materials. The exothermic welding powder comprises, by weight, 45%-60% of copper oxide, 8%-13% of aluminum powder, 20%-30% of copper powder, 5%-15% of copper-phosphorus alloy powder, 1%-5% of tin powder, 2%-6% of fluorite powder, 1%-4% of borax powder and the balance alloy powder. The alloy powder comprises, by weight, 8%-12% of Ca, 40%-47% of Si, 28%-32% of Ba and the balance impurities. According to the exothermic welding powder, raw materials are low in price and easy to get, the problems that pores, slag inclusion, hot tear and the like can be easily generated in the welding process by using the exothermic welding powder are solved, the quality of welded joints is reliable, the connecting cost of the novel grounding grid materials is lowered, and the development of a grounding system in electric power engineering in China is facilitated.

Description

technical field [0001] The invention belongs to the technical field of welding materials, and in particular relates to a thermite welding powder used for welding new grounding grid materials. Background technique [0002] With the development of the power system, the requirements for grounding devices in the power system are becoming more and more stringent. A long-term, reliable and safe grounding system is the fundamental guarantee and important measure to maintain the stable operation of the power system and ensure the safety of operating personnel and electrical equipment. The key to ensure the long-term safe and reliable operation of the grounding system lies in good quality grounding materials and reliable connections. [0003] As a grounding material, copper has the advantages of low resistivity, good conductivity, and fast discharge, but it has disadvantages such as corrosion of nearby steel structures, poor anti-corrosion resistance in acidic soil, troubles for cath...

Claims

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Application Information

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IPC IPC(8): B23K35/30B23K23/00
CPCB23K23/00B23K35/302
Inventor 许江晓龙伟民蔡红生沈元勋汪毅李秀朋胡峰涛陈恒
Owner STATE GRID CORP OF CHINA
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