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Die for exothermic welding of grounding grid and welding method

A technology of exothermic welding and grounding grid, applied in aluminothermic welding equipment, welding equipment, welding equipment, etc., can solve the problem of large current load capacity, and achieve the effect of strong corrosion resistance, fast welding speed and simple structure

Inactive Publication Date: 2015-05-20
CHINA RAILWAY BEIJING ENG GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] 1. Large current load capacity

Method used

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  • Die for exothermic welding of grounding grid and welding method
  • Die for exothermic welding of grounding grid and welding method

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Embodiment Construction

[0036] Please refer to the attached figure 1 And attached figure 2 As shown, the present invention is a mold for exothermic welding of grounding grids, which includes a mold body 1, which is symmetrically arranged left and right, so as to facilitate mold closing and mold opening.

[0037] A solder powder filling area 2 , a mold cavity 3 , a copper bar placement cavity 4 and a ground rod placement cavity 5 are sequentially arranged in the mold body 1 from top to bottom. A mold cover 9 is also covered on the top of the mold body 1 .

[0038] Wherein, the lower part of the solder powder filling area 2 is connected to the mold cavity 3, which is tapered from top to bottom, so as to facilitate the convergence of molten exothermic flux. A supporting piece 6 is provided between the solder powder filling area 2 and the mold cavity 3 , and the supporting piece 6 prevents exothermic flux before reaction from flowing into the mold cavity 3 .

[0039] The copper bar placement cavity 4...

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Abstract

The invention relates to a die for exothermic welding of a grounding grid and a welding method. The welding method includes the process steps: cleaning a copper bar, a grounding rod and a die body and placing the copper bar and the grounding rod to be welded into a copper bar placing cavity and a grounding rod placing cavity respectively; clamping a left piece and a right piece of the die body, laying down a supporting piece, sealing the top of a die cavity and stopping exothermic welding flux before reaction from flowing into the die cavity; pouring the exothermic welding flux into a welding powder filling area, spreading initial pyrophoric powder and covering a die cover; igniting the pyrophoric powder by a firing gun and performing exothermic reaction of the exothermic welding flux in the die; opening the die after hot melting reaction of the exothermic welding flux for 10-20 seconds; taking out the copper bar and the grounding rod which are welded, and removing molten slag. The shortcomings of welding slag, easiness in oxidation, low connecting strength, easiness in corrosion, small contact area, large contact resistance and the like in traditional welding such as electric welding and braze welding, additional energy and power are omitted, and the welding method is a simple, high-efficiency and high-quality metal connecting process.

Description

【Technical field】 [0001] The invention relates to a welding technology for a railway grounding grid, in particular to a mold for exothermic welding of a grounding grid and a welding method, belonging to the field of welding technology. 【Background technique】 [0002] With the rapid development of my country's railway construction, the requirements for the design of the main grounding grid of the traction substation are also getting higher and higher. A long-term, reliable and stable grounding system is the fundamental guarantee for maintaining the stable operation of traction substation equipment and ensuring the safety of equipment and personnel. There are a large number of connections in the grounding conductor of the main grounding grid of the traction station. This connection must be reliable and firm to ensure the safe operation of the main grounding grid of the traction substation. [0003] The principle of exothermic welding is to use copper oxide, under a high tempe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K37/00B23K28/00
CPCB23K37/0443B23K23/00
Inventor 汪建国史振勇张利金敏彭超姚运军杨龙章
Owner CHINA RAILWAY BEIJING ENG GRP CO LTD
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