Aluminum integral cross beam of zinc electrodeposition cathode plate and preparation method of aluminum integral cross beam

The invention discloses a zinc electrodeposition cathode plate aluminum integral cross beam and a preparation method thereof. The zinc electrodeposition cathode plate aluminum integral cross beam is formed by welding a low-pressure casting aluminum cross beam, a lifting lug and a copper-aluminum conductive piece through friction stir welding, the electric conductivity of the zinc electrodeposition cathode plate aluminum integral cross beam is 29.90 or above, the service life is 14 months or above, and the average temperature of the contact position of a mesh bar and copper in the electrodeposition process is lower than 53 DEG C. The preparation method comprises the steps of pretreatment, mold filling, pressure maintaining solidification and aftertreatment. The low-pressure casting process adopted by the invention is free of casting defects such as shrinkage cavities, slag inclusion and bubbles, the copper-aluminum composite conductive head adopts explosive welding or flash welding according to use occasions,