A welding method between the cathode steel rod of an aluminum electrolytic cell and a crimping device

Abstract

The invention relates to a welding method, in particular to a method for welding of a cathode steel bar of an aluminum electrolytic tank with a crimping device. The method comprises the following steps: plugging the bottom of the crimping device by using a graphite plate; sealing the outer side, consisting of the crimping device and the cathode steel bar, of a weld joint by using mud to form the weld joint; placing a crucible above the weld joint, wherein a sprue is formed in the lower part of the crucible; preheating an L-shaped copper plate in the crimping device and the crucible to 250 to 400 DEG C; placing 1,500 to 2,000 g of copper self-propagating welding powder into the crucible; scattering one layer of pyrophoric powder on the surface; igniting the pyrophoric powder to realize fusion welding; and eliminating the peripheral welding slag to form a weld joint. The method is unique; the conductivity of the crimping device part is obviously improved; energy consumption is reduced; and the potential safety hazard of production is eliminated.

Description

technical field [0001] The invention relates to a welding method, in particular to a welding method between a cathode steel rod of an aluminum electrolytic cell and a crimping device. Background technique [0002] In the aluminum electrolysis industry, with the continuous operation of electrolytic production, until the life cycle of the electrolytic tank, the lining of the tank is seriously damaged, the insulation is damaged, and the equipment cannot be maintained or the furnace leaks, and the electrolytic tank must be repaired. During the overhaul of the electrolytic cell, the small flexible bus bar of the electrolytic cell cathode and the cathode steel bar are crimped and connected through the L-shaped copper-aluminum explosion block, and there is a large pressure drop at the interface of the joint (according to statistics, the pressure drop is between 20-50mv, and individual Even as high as 200mv), current distribution and other phenomena are major safety hazards in alumi...

AI Technical Summary

Problems solved by technology

However, there is a large magnetic field around the aluminum electrolytic cell, so conventional arc welding cannot be used

Due to the large welding area, the thermal conductivity of copper is too strong, and the commonly used gas welding cannot be used

How to increase the conductivity of the structure, there is no solution yet

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