A Welding Method for Reducing Electrolyzer Voltage Drop

A welding method and electrolytic cell technology, which is applied in the field of electric power, can solve the problems of general conductive paste effect, insignificant pressure drop effect, deformation of aluminum electrolytic cell, etc., and achieve smooth brazing joints, beautiful appearance, and small deformation of weldments Effect

Active Publication Date: 2021-02-02
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method of mechanically combining by pressing the screw has no obvious effect on reducing the pressure drop.
Patent CN1769535A reduces the pressure drop by applying conductive paste and crimping, but the effect of conductive paste is general, and crimping is easy to deform the aluminum electrolytic cell due to the pressure applied to the workpiece
In addition, the patent also generally introduces welding measures, but not all welding processes are suitable for aluminum electrolytic cells, because the temperature of most welding is too high, which can easily lead to the melting of aluminum, and the generated high temperature is easy to cause thermal reaction of the busbar or oxidation

Method used

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  • A Welding Method for Reducing Electrolyzer Voltage Drop
  • A Welding Method for Reducing Electrolyzer Voltage Drop

Examples

Experimental program
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Effect test

Embodiment 1

[0027] Grind and clean the surface 3 to be welded at the connection between the upright busbar 1 and the short-circuit busbar 2. Select an aluminum plate 6 with a suitable size, place the aluminum plate 6 horizontally on a thin metal plate 7, and apply a thin layer of rosin on the upper surface of the aluminum plate 6 with a brush. Use the oxyacetylene flame 5 to heat the metal plate 7 so as to achieve the purpose of heating the aluminum plate 6. After the rosin on the surface of the aluminum plate 6 smokes, remove the flame. 0.5% Mn; 7.5% Ag; 1.5% Cu; 15% Zn; Put a thin layer of solder on it. Apply a layer of rosin on the surface of the workpiece to be welded. After confirming that it is correct, use a tool to tighten the aluminum plate 6, closely match the aluminum plate 6 and the surface 3 of the electrolytic tank to be welded and heat it evenly. The heating temperature is 350-450 ° C. 6 Apply a pressure of 5-10MPa. Remove the flame and remove the clamping tool after coo...

Embodiment 2

[0029] Grind and clean the surface 3 to be welded at the connection between the upright busbar 1 and the short-circuit busbar 2. Select an aluminum plate 6 with a suitable size, place the aluminum plate 6 horizontally on a relatively thin metal plate 7, and apply a thin layer of aluminum flux on the upper surface of the aluminum plate 6 with a brush. Use the oxyacetylene flame 5 to heat the metal plate 7 so as to achieve the purpose of heating the aluminum plate 6. After the aluminum flux on the surface of the aluminum plate 6 smokes, remove the flame. 0.2% Mn; 6% Ag; 1.5% Cu; 18% Zn; 0.3% rare earth elements; 47% Sn brazing filler metal to gently scrape the upper surface of the aluminum plate 6, so that the aluminum plate 6 is evenly coated Put a thin layer of solder on it. Apply a layer of aluminum flux on the surface of the workpiece to be welded. After confirming that it is correct, use a tool to tighten the aluminum plate 6, closely match the aluminum plate 6 and the sur...

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Abstract

The invention discloses a welding method for reducing the voltage drop of an electrolytic cell. Firstly, the surface to be welded at the junction of a column busbar and a short-circuit busbar is polished and cleaned, and the two are closely attached together. Prepare the corresponding amount of solder and flux in advance according to the number of electrolytic cells to be welded. Next, select an aluminum plate with a suitable size, apply a layer of flux on the surface of the aluminum plate, then heat the aluminum plate and apply a layer of solder. Apply a layer of flux on the surface of the workpiece to be welded, and after confirming that it is correct, attach the aluminum plate to the surface to be welded and fix it. Finally, the workpiece is uniformly heated for a short period of time and then cooled to room temperature to complete the weld. After the unit has cooled completely to room temperature, it is cleaned and sanded to remove debris and bring the appearance to specification. The construction method of the invention is simple, the cost is low, and the voltage drop of the electrolytic cell can be obviously and effectively reduced without damaging the electrolytic cell.

Description

technical field [0001] The invention belongs to the field of electric power, and relates to a method for reducing the black voltage of an electrolytic cell when the cell is stopped, in particular to a welding method for reducing the voltage drop of an electrolytic cell. Background technique [0002] Electrolysis is widely used in industrial production as a process technology. Taking aluminum as an example, a large part of the world's aluminum is produced by electrolysis. Aluminum is widely used due to its low density, excellent electrical and thermal conductivity, good ductility, high reflectivity, and resistance to oxidation and corrosion. At present, a large number of enterprises in China are engaged in the electrolytic aluminum industry. For example, the electrolytic aluminum factory of Shandong Aluminum Industry is equipped with a large number of aluminum electrolytic cells, with an annual output of electrolytic aluminum ingots reaching 75,000 tons. However, due to rea...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K1/005B23K1/20B23K35/26
CPCB23K1/005B23K1/203B23K1/206B23K35/268
Inventor 张国栋朱龙强刘延东王麒瑜龚卓梅青松杨兵
Owner WUHAN UNIV
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