Method for thermite welding aluminium electrolytic cell cathode steel bar

A technology for cathode steel rods and aluminum electrolytic cells, applied in aluminothermic welding equipment, welding equipment, manufacturing tools, etc., can solve problems such as increasing power consumption, increasing labor intensity of employees, and affecting welding quality, so as to achieve firm welding and excellent welding methods Fast and convenient, good welding effect

Inactive Publication Date: 2009-08-05
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the welding of the transition section has not been reported at home and abroad, and now the aluminum electrolysis plant mostly uses high current production. In order to weaken the interference caused by the strong electromagnetic field on the black welding, it is forced to use the "double transition section" method to connect the cathode steel rod. And small busbars, and sometimes it is necessary to erect temporary busbars to share the current, which increases power consumption. At the same time, the interference of strong magnetic field also affects the welding quality and increases the labor intensity of employees.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] In the process of thermite welding of the cathode steel rod with a width of 130×130mm in the 85kA prebaked tank, firstly, the proportion is 27% Al powder, 6% Fe powder, and the balance is Fe 2 o 3 Put the powder welding powder into the quartz crucible; accurately place the cathode steel rods: place the two cathode steel rods to be welded so that the distance between the welding joints in the middle is kept at 2cm, and the welding joints are kept clean, and the cross section of the welding joints is kept vertical and parallel; Assembling the welding model: Assemble the left, right and bottom parts of the welding model at the interface of the cathode rod to be welded, and clamp it with an external iron fixture to form a welding model inner cavity with two air holes sealed on the outer three sides; the cathode steel Rod preheating: In order to improve the welding effect, it is necessary to preheat the surface of the cathode steel rod welding joint before welding, so that t...

Embodiment 2

[0022] In the process of thermite welding of the cathode steel rod with a width of 130×130mm in the 85kA prebaked tank, firstly, the proportion is 24% Al powder, 7% Fe powder, 3% ferromanganese alloy powder, and the balance is Fe 2 o 3 Put the powder welding powder into the quartz crucible; accurately place the cathode steel rods: place the two cathode steel rods to be welded so that the distance between the welding joints in the middle is kept at 2cm, and the welding joints are kept clean, and the cross section of the welding joints is kept vertical and parallel; Assembling the welding model: Assemble the left, right and bottom parts of the welding model at the interface of the cathode rod to be welded, and clamp it with an external iron fixture to form a welding model inner cavity with two air holes sealed on the outer three sides; the cathode steel Rod preheating: In order to improve the welding effect, it is necessary to preheat the surface of the cathode steel rod welding...

Embodiment 3

[0024] During the thermite welding process of the cathode steel bar with a width of 130×130mm in the 85kA prebaked tank, firstly, the proportion is 22% Al powder, 9% Fe powder, 5% ferromanganese alloy powder, and the balance is Fe 2 o 3 Put the powder welding powder into the quartz crucible; accurately place the cathode steel rods: place the two cathode steel rods to be welded so that the distance between the welding joints in the middle is kept at 2cm, and the welding joints are kept clean, and the cross section of the welding joints is kept vertical and parallel; Assembling the welding model: Assemble the left, right and bottom parts of the welding model at the interface of the cathode rod to be welded, and clamp it with an external iron fixture to form a welding model inner cavity with two air holes sealed on the outer three sides; the cathode steel Rod preheating: In order to improve the welding effect, it is necessary to preheat the surface of the cathode steel rod weldin...

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PUM

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Abstract

The invention discloses a method for welding aluminum electrolytic cell cathode steel rods with thermite, and relates to an aluminum electrolytic cell overhaul, in particular to an overhaul welding method for electrolytic cell cathode steel rods. It is characterized in that the thermite reaction agent powder containing aluminum powder and iron oxide powder is put into a quartz crucible with a self-fusing plug on the upper part of the gap between the two cathode steel rods and at the bottom, and is ignited with a propellant magnesium strip to produce melting The molten iron flows into the cavity of the welding model formed by sealing the left, right and bottom surfaces of the cathode steel rod gap with a quartz sand mold, and two sections of cathode steel rods are welded. The method of the invention can avoid the influence of strong magnetic field and environment on the welding operation, so that the welding method is fast and convenient, the welding is firm, the cathode voltage is reduced, and the overall effect is good.

Description

technical field [0001] The invention discloses a method for welding aluminum electrolytic cell cathode steel rods with thermite, and relates to an aluminum electrolytic cell overhaul, in particular to an overhaul welding method for electrolytic cell cathode steel rods. Background technique [0002] After the electrolyzer is shut down, it must be overhauled before normal production can be carried out. One of the important links in the overhaul of the electrolyzer is the welding of the cathode steel rod. During the implementation process, the cathode steel rod and the cathode small busbar are first cut and separated from the old steel rod, and then connected to the new steel rod. [0003] According to the state of the metal in welding, welding can be divided into three categories: pressure welding, fusion welding and brazing. In the aluminum electrolysis industry, the cathode steel bar is generally welded layer by layer (that is, black contact melting welding), and the part w...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25C3/08B23K23/00
Inventor 吕子剑吴举李希明隋红叶王会全成庚姜电华李方义党步军孙春亮张银贵崔新芳
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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