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.