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A secondary self-propagating welding method for a cathode soft strip and a large busbar for an aluminum electrolytic cell

A technology of self-propagating welding and cathode soft tape, which is applied in the direction of aluminothermic welding equipment, welding equipment, welding medium, etc., can solve problems such as inability to weld, increase energy consumption, and soft tape melt-through, and achieve good conductivity and workpiece strength The effect of high and wide application prospects

Inactive Publication Date: 2016-06-29
QINGTONGXIA ALUMINUM GRP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The gas welding method is only suitable for thin plate parts, and the efficiency is low, so it can only be applied to local repair of aluminum soft strips
The use of carbon arc welding requires current reduction and power outage, which will lead to a reduction in the production of electrolytic aluminum, a substantial increase in energy consumption, and abnormal slot conditions, etc.
The self-propagating welding method is currently a widely used non-stop repair technology for aluminum electrolytic cells. However, when this technology welds cross-sections with different areas such as cathode soft strips and large busbars, it cannot perform limited welding due to the difficulty in controlling the heat.
If the heat is too high, one side of the soft belt will melt through, and if the heat is too low, it will not be welded

Method used

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  • A secondary self-propagating welding method for a cathode soft strip and a large busbar for an aluminum electrolytic cell
  • A secondary self-propagating welding method for a cathode soft strip and a large busbar for an aluminum electrolytic cell
  • A secondary self-propagating welding method for a cathode soft strip and a large busbar for an aluminum electrolytic cell

Examples

Experimental program
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Effect test

Embodiment 1

[0021] Embodiment one: if figure 1 , 2 , 3, and 4 show:

[0022] A secondary self-propagating welding method for cathode flexible strips and large busbars used in aluminum electrolytic cells, welding of small soft strips for cathodes of 3106# electrolytic cells of Ningdong Branch of Qingtongxia Aluminum Co., Ltd. First, use gas cutting or other mechanical methods to remove the used cathode soft belt from the cathode steel rod and the busbar. Utilize electric arc welding to weld aluminum plate 1 to one end of new soft belt 9 in the overhaul workshop, and weld steel-aluminum explosive block 10 on the other end. The thickness of the aluminum plate 1 is 35mm, and the length and width are 190mm and 220mm respectively. First, use a grinder to polish the welding surface of the busbar 2 and the aluminum plate 1 to remove scale and oil, and apply aluminum flux on the welding surface of the aluminum plate and the busbar. Clamp the graphite plate 3 on the bottom and left and right si...

Embodiment 2

[0024] Embodiment two: if figure 1 , 2 , 3, and 4 show a secondary self-propagating welding method for aluminum electrolytic cells with cathode soft strips and large busbars, welding of small soft strips for cathodes of Qingtongxia Aluminum Co., Ltd. Ningdong Branch 3110#. First, use gas cutting or other mechanical methods to remove the used cathode soft belt from the cathode steel rod and the busbar. Utilize electric arc welding to weld aluminum plate 1 to one end of new soft belt 9 in the overhaul workshop, and weld steel-aluminum explosive block 10 on the other end. The thickness of the aluminum plate 1 is 35 mm, and the length and width are 150 mm and 200 mm, respectively. First, use a grinder to polish the welding surface of the busbar 2 and the aluminum plate 1 to remove scale and oil, and apply aluminum flux on the welding surface of the aluminum plate and the busbar. Clamp the graphite plate 3 on the bottom and the left and right sides of the weld seam with a clamp ...

Embodiment 3

[0026] Embodiment three: as figure 1 , 2, Shown in 3 and 4, a secondary self-propagating welding method for aluminum electrolytic cells with cathode soft strips and large busbars, welding of small soft strips for cathodes of Qingtongxia Aluminum Co., Ltd. Ningdong Branch 4213#. First, use gas cutting or other mechanical methods to remove the used cathode soft belt from the cathode steel rod and the busbar. Utilize electric arc welding to weld aluminum plate 1 to one end of new soft belt 9 in the overhaul workshop, and weld steel-aluminum explosive block 10 on the other end. The thickness of the aluminum plate 1 is distributed in a gradient, with the top 20mm and bottom 30mm, and the length and width are 190mm and 220mm respectively. First, use a grinder to polish the welding surface of the busbar 2 and the aluminum plate 1 to remove scale and oil, and apply aluminum flux on the welding surface of the aluminum plate and the busbar. The graphite plate 3 is clamped on the bott...

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Abstract

The invention relates to a secondary self-propagating welding method for a cathode soft belt and a large bus for an aluminum electrolysis cell. The method includes first taking down a waste cathode soft belt, welding an aluminum plate at one end of a new soft belt beam, welding a steel aluminum explosion block at the other end, coating aluminum welding flux on the groove face, arranging a crucible above a welding seam, arranging a self-fluxing plug in the crucible, preheating a bus material and the crucible, arranging welding powder into the welding seam and the crucible, evenly scattering pyrophoric powder on the surface of welding powder at the two positions, igniting the pyrophoric powder in the welding seam, erecting the crucible above the welding seam quickly after the welding powder finishes reaction and igniting the pyrophoric powder in the crucible at the moment to enable the welding powder in the crucible to react. When a metal solution enters the welding seam, welding of the aluminum plate at the end of the soft belt and the bus can be finished, and the steel aluminum explosion block at the other end of the soft belt is connected with a steel rod on a groove casing through arc welding. A workpiece with different sections has good conductivity and strength when the workpiece is welded through the method.

Description

technical field [0001] The invention relates to a welding method, in particular to a secondary self-propagating welding method of a cathode soft strip and a large busbar for an aluminum electrolytic cell. Background technique [0002] In recent years, my country's aluminum industry has developed rapidly, and the output of electrolytic aluminum ranks first in the world. Aluminum electrolysis technology has reached or approached the world's advanced level in many aspects. In the production of electrolytic aluminum, in order to increase the output of aluminum, the current intensity of the aluminum electrolytic cell shows an upward trend. At present, the current intensity of the domestic aluminum electrolytic cell has reached 350KA. In the process of electrolytic aluminum, direct current generally enters the busbar system through the cathode steel rod. In the prior art, the cathode steel rod is generally connected to the copper-aluminum or steel-aluminum explosive block to conn...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K23/00B23K35/22
Inventor 杨宏伟张国栋杨勇张晓军张思贤尚文祥李海琦
Owner QINGTONGXIA ALUMINUM GRP
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