In-situ power-cut-free welding method for soft mother belts and aluminum bus of cathode of aluminum electrolysis cell

Abstract

The invention relates to the electrolytic aluminum industry, in particular to an in-situ power-cut-free welding method for soft mother belts and an aluminum bus of the cathode of an aluminum electrolysis cell. The method comprises the following steps of 1 in-situ grinding, 2 in-situ fixing, 3 in-situ fusion, 4 pre-welding treatment, 5 preheating, 6 exothermic welding and 7 post-welding treatment. By means of the method, in-situ connection between the soft mother belts and the aluminum bus is directly completed through exothermic welding, the defect that the soft mother belts of a sheet type structure cannot be directly welded in a magnetic field is overcome, the economic benefits of an aluminum electrolysis enterprise are increased, and repairing of the soft mother belts for the aluminum electrolysis enterprise is realized. The operation can be completed under the condition that serial aluminum electrolysis cells are powered all the time, and the repairing purpose can be achieved on the promise of not affecting production of the serial aluminum electrolysis cells. The method is suitable for welding of the soft mother belts and the aluminum bus in various cell types, and is good in universality, easy to operate and high in welding repair efficiency.

Description

technical field [0001] The invention belongs to the electrolytic aluminum industry, and relates to an in-situ non-stop welding method for a cathode soft master strip of an aluminum electrolytic cell and an aluminum bus bar. 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, which also means that the electrolytic cell is in a stronger magnetic field. In the process of electrolytic aluminum, direct current enters the busbar system through the cathode steel rod, and the aluminum busbar and soft master strip play a vital role in the transmission process of strong current. However, during the produc...

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Problems solved by technology

The three patented technologies all have the following disadvantages: ① The soft master tape needs to be removed from the original position and moved outside the magnetic field, which destroys the effective connection between the original soft master tape and the cathode steel rod, and greatly increases the number of procedures in the subsequent repair process ; ② It is necessary to use the original welding method to weld the soft master tape and the prefabricated aluminum block outside the magnetic field, which is too dependent on the prefabricated aluminum block; ③ Move the welded soft master tape to the working position in the magnetic field, and then use heat release The welding method welds the prefabricated aluminum block and the aluminum bus bar. Since the surface to be welded between the aluminum base material and the prefabricated aluminum block is relatively flat, the interface bonding after exothermic welding is weak, and there are likely to be more unfused defects; ④ During the entire repair process , part of the process needs to be carried out outside the magnetic field, the process is more complicated, laborious and time-consuming

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