Electrified welding method of aluminum cell cathode steel bar

Abstract

The invention relates to an overhaul process of an aluminum electrolytic tank, in particular to a live welding method of steel cathode bars during overhaul of aluminum electrolytic tank. The live welding method of the steel cathode bars comprises the following steps of: arranging a mold on a steel cathode bar; arranging a crucible on the mold; adding flux and ignition composition into the crucible; arranging a splitter on the crucible; arranging a mold cover on the splitter; adding the ignition composition and a blasting fuse in an ignition hole on the mold cover; igniting the blasting fuse to start burning; injecting molten metal generated by chemical reaction into a cavity formed by the gap between a new and a used steel cathode bars and the pedestal of the mold by a guide channel holes to weld the two steel cathode bars; waiting for 5 min; and demolding to achieve the live welding of steel cathode bar of the aluminum electrolytic tank. The live welding method can be used for welding steel cathode bars without switching off power supply, and the operator operates in the tank to solve the safety problem. The voltage drop on furnace bottom is 299 mV while starting the aluminum electrolytic tank.

Description

technical field [0001] The invention relates to an overhaul process for an aluminum electrolytic cell, in particular to a live welding method for a cathode steel rod during the overhaul of an aluminum electrolytic cell. Background technique [0002] At present, after the aluminum electrolytic cell is shut down, it is necessary to cut off and hang out the used cathode steel rod from the tank shell, and place the steel rod head protruding from the steel rod hole of the tank shell outside the tank shell at the junction with the cathode soft belt Cut off, and then take out the steel rod head. During the overhaul of the electrolyzer, a new cathode steel rod is installed on the cathode, and the two ends of the steel rod protrude from the tank shell. Because the method of welding the cathode steel rod and the cathode soft strip is the traditional argon arc welding, due to the strong magnetic field generated by the large current passing through the electrolytic cell, it is necessar...

AI Technical Summary

Problems solved by technology

[0003] The adverse effects of the existing power outage welding technology on the electrolytic series are as follows: it takes 40 to 50 minutes to weld the cathode steel rod of one cell, and at this time, hundreds of cells in the electrolytic series cannot be produced under the power outage state; the impact on the electrolytic cell after power is turned on again Large, affecting power supply

Unsafe factors in the welding process include: manual welding is used for cathode steel rod welding, and the welder stands on the cathode busbar during welding, which not only has potential safety hazards of falling from high altitudes, but also has high-temperature baking and fumigation of welding fumes, and the operating environment is harsh

Difficulties in cutting off the steel rod head and welding operation include: the steel rod head is not easy to take out from the cathode steel rod hole, it needs to be lifted out of the tank, affected by the magnetic field of the electrolytic tank, it is difficult to lift out; the steel plate is used to hold the cathode The connection between the steel bar and the cathode soft belt requires two people to operate. Due to the narrow space, the labor intensity of the workers is greatly increased; the temperature of the column busbar is as high as 80°C, and it is very easy to burn the operator during the welding process. The butt joint and welding are affected to a certain extent

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