Aluminum hot welding flux and welding method for welding cathode square steel of aluminum electrolytic baths in high-intensity magnetic field environments

Abstract

The invention discloses aluminum hot welding flux and a welding method for welding cathode square steel of aluminum electrolytic baths in high-intensity magnetic field environments. The aluminum hot welding flux comprises, by weight, 16.1% of aluminum powder, 61% of iron oxide, 8% of alloying agents and 14.9% of fillers. The alloying agents comprise Mn, Cr and V alloy. The fillers comprise steel wire heads and iron balls. The welding method includes aluminum hot welding procedures of aligning, die filling, preheating, welding and die opening. The aluminum hot welding flux and the welding method have the advantages that electricity consumption is omitted when the cathode square steel of the electrolytic baths is welded, influence of magnetic fields on high-temperature molten steel obtained by the aid of alumino-thermic reaction can be prevented, the aluminum hot welding flux and the welding method are quite applicable to welding operation on the cathode square steel of the electrolytic baths in the high-intensity magnetic field environments in the aluminum electrolysis industry, the welding degree is higher than 95%, bottom resistance of the welded electrolytic baths is nearly zero, the electrolytic baths can be uniformly electrified and can stably and safely run, voltages further can be reduced by 6-10 millivolts, and electricity can be saved by 60-100 kilowatt-hours by each ton of aluminum.

Description

technical field [0001] The invention relates to a thermite flux and a welding method for welding cathode square steel of an aluminum electrolytic cell in a strong magnetic field environment. Background technique [0002] Due to the production characteristics of the electrolytic aluminum industry, the electrolytic cell enters the overhaul cycle after three to four years of operation, and the cathode square steel laid at the bottom of the electrolytic cell needs to be replaced due to corrosion. The cathode square steel is connected to the aluminum bus bar outside the electrolytic cell, which is a non-detachable component. When replacing, a corresponding length should be reserved at the two ends of the cathode square steel connected to the aluminum bus bar, and the corroded part should be cut off, and the new cathode square steel should be replaced with the original one. The reserved short ends for connecting the aluminum bus bars are welded together. Therefore, replacing and ...

AI Technical Summary

Problems solved by technology

If the cathode square steel is not well welded, the current input from the aluminum busbar will generate a large resistance when passing through the cathode square steel, and the degree of welding of nearly 100 welding joints due to the influence of the magnetic field is inconsistent. The resistance value of the group is not the same, which will lead to many harmful phenomena such as uneven electrification at the bottom of the electrolytic cell, heating at the bottom of the cell, and unstable operation of the electrolytic cell, which will also affect safe production.

The increase of the resistance affects the input of the current, which greatly increases the power consumption.

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