Electrolytic aluminum cathode steel-aluminum melting and brazing welding method

Abstract

The invention discloses an electrolytic aluminum cathode steel-aluminum melting and brazing welding method. The method aims at solving the problems that in the production process of electrolytic aluminum, steel-aluminum welding efficiency is low, and a welding joint is poor in electrical conductivity. According to the method, a layer of welding flux with the thickness ranging from 80 microns to 150 microns is uniformly applied to each welding workpiece with a surface oxidation layer removed, and the generation amount of brittle compounds at the welding joint is reduced, so that mechanical performance of the welding joint is improved. The method that melting welding is conducted on the aluminum welding workpiece, and brazing welding is conducted on the steel welding workpiece is adopted; after preheating treatment is conducted, the aluminum welding workpiece and the steel welding workpiece are welded through welding wires. The method is low in cost, great in operability and uniform in welding composition; performance test results indicate that the pressure drop, formed after welding, at the welding joint can be lowered by 25 mV or more; the tensile strength can reach 110-150 Mpa; the shearing strength can reach 100-140 Mpa; electrical conductivity and mechanical performance are obviously superior to the traditional explosion welding mode; and economical benefits are remarkable.

Description

technical field [0001] The invention relates to a steel-aluminum dissimilar metal welding method, in particular to a steel-aluminum fusion brazing welding method mainly used in electrolytic aluminum production between cathode steel rods and aluminum soft strips. Background technique [0002] In the aluminum electrolytic production process, regardless of the new electrolytic cell or the overhauled electrolytic cell, the cathode steel rod needs to be welded with workpieces of different materials. At present, in the production of electrolytic aluminum, the connection method between the cathode steel rod and the aluminum soft strip is mainly to use the form of welding explosion welding block for transitional connection, or to use the explosion welding block to weld the cathode steel rod, and then the aluminum busbar and the explosion welding Block crimping and other methods. [0003] However, the transition connection between the cathode steel rod and the aluminum soft strip wi...

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problems of poor operability, low welding efficiency, poor quality and poor electrical conductivity of direct welding of steel-aluminum dissimilar metals between cathode steel rods and aluminum soft strips in the production process of electrolytic aluminum, the invention provides a cathode steel rod in the production of electrolytic aluminum The steel-aluminum fusion brazing welding method with aluminum soft strip has simple welding method, strong operability and low cost, and can effectively ensure uniform weld seam, excellent mechanical properties and good electrical conductivity of welded joints