Flux for electrified maintenance of riser bus bars of aluminum cells

A column bus, live repair technology, used in metal processing equipment, welding equipment, manufacturing tools, etc., can solve the problems of poor wetting effect, difficult fusion, and high power consumption of welding joints, achieving high safety and fusion rate. High, smooth response effect

Active Publication Date: 2015-02-04
GUIZHOU BRANCH CHINA ALUMINUM IND +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has three shortcomings: (1) Due to the limitation of heating conditions, the temperature of the molten aluminum is only 900-1180 degrees, which is only 250-400 degrees higher than the melting point of aluminum. Better fusion; (2) The caulking of the aluminum liquid only depends on the flow of gravity, and its caulking effect is not good; (3) No infiltrating elements are added to the aluminum liquid, and the wetting effect with the base metal is poor
Therefore, the welds obtained by casting welding in this way generally have the problem of poor fusion effect of the side wall
If applied to actual production, not only the welding joint consumes more power, but also lays a hidden danger for long-term safe and normal operation

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Due to the breakdown of the insulation board at the short-circuit opening of the 200KA aluminum electrolytic cell, the surface of the column bus and the short-circuit bus are blasted. The dimensions of the damaged surface of the column bus are: length 420mm, width 150mm, depth 80mm.

[0018] Calculate the addition amount of flux for live repair of aluminum electrolytic cell column busbar:

[0019] Since the size of the damaged surface of the column busbar is: 420mm in length, 150mm in width, and 80mm in depth, the volume of the groove to be welded on the column busbar is: 42×15×8=5040cm 3 .

[0020] After self-fluxing flux welding, including two parts of welding meat and welding slag, the density of welding meat is 3.2 ~ 4.0g / cm 3 , The self-fluxing flux is calculated according to the liquid yield of 50%, and the liquid yield refers to the percentage of the liquid metal obtained after the reaction in the mass of the original flux. Then the mass of self-fluxing flux re...

Embodiment 2

[0032] The column busbar of 120KA aluminum electrolytic cell is washed out due to the leak. The size of the damaged surface of the column busbar is: length 300mm, width 200mm, depth 120mm.

[0033] Calculate the addition amount of flux for live repair of aluminum electrolytic cell column busbar:

[0034] Since the size of the damaged surface of the column busbar is: 300mm in length, 200mm in width, and 120mm in depth, the volume of the groove to be welded on the column busbar is: 30×20×12=7200cm 3 .

[0035] After self-fluxing flux welding, including two parts of welding meat and welding slag, the density of welding meat is 3.2 ~ 4.0g / cm 3 , The self-fluxing flux is calculated according to the liquid yield of 50%, and the liquid yield refers to the percentage of the liquid metal obtained after the reaction in the mass of the original flux.

[0036] Then the mass of self-fluxing flux required is between 46.1 and 57.6kg:

[0037] 7200cm 3 ×3.2 g / cm 3 ÷50% / 1000=46.1 (kg)

...

Embodiment 3

[0047] 200KA aluminum electrolytic cell due to the arc discharge at the short-circuit opening, the surface of the column bus and the short-circuit bus are blasted, and the size of the damaged surface of the column bus is: length 250mm, width 180mm, depth 100mm.

[0048] Calculate the addition amount of flux for live repair of aluminum electrolytic cell column busbar:

[0049] Since the size of the damaged surface of the column busbar is: 250mm in length, 180mm in width, and 100mm in depth, the volume of the groove to be welded on the column busbar is: 25×18×10=4500cm 3 .

[0050] After self-fluxing flux welding, including two parts of welding meat and welding slag, the density of welding meat is 3.2 ~ 4.0g / cm 3 , The self-fluxing flux is calculated according to the liquid yield of 50%, and the liquid yield refers to the percentage of the liquid metal obtained after the reaction in the mass of the original flux.

[0051] Then the mass of self-fluxing flux required is between ...

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PUM

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Abstract

The invention discloses a flux for electrified maintenance of riser bus bars of aluminum cells. The flux comprises self-fluxing soldering flux and blasting powder. The blasting powder covers on the surface layer of the self-fluxing soldering flux, and by mass percentage, the blasting powder and the self-fluxing soldering flux range from 0.15:100 to 0.25:100. The flux can be used for maintaining the riser bus bars in the electrified aluminum cells, the self-fluxing soldering flux and the blasting powder are stable in reaction and high in safety, fusing rate of side walls of soldering joints is high, performances of soldering joints can be similar to base materials, and using is facilitated.

Description

technical field [0001] The invention relates to a flux, in particular to a flux for electrified repair of a column bus bar of an aluminum electrolytic cell. Background technique [0002] In aluminum smelting production, in order to increase the output of aluminum, the current intensity of the electrolytic cell is on the rise. At present, the current intensity of the electrolytic cell in some aluminum electrolysis plants has reached 500KA. Such a large DC current produces a strong magnetic field with a diameter of several meters in the electrolytic cell and its surroundings. For example, the highest magnetic field strength in the X-axis direction of a 500KA electrolytic cell has reached 1200GS during actual operation. [0003] In the electrolysis plant, the blasting on the surface of the column busbar caused by the arc discharge of the short circuit and the breakdown of the insulation board is the busbar damage that is often encountered. In order to repair the damaged short ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K35/362
Inventor 史生文张国栋张明谦张富巨张整社张峰春郭爱军韩宁
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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