Method for welding steel/aluminum heterogeneous material by adding laser modified zinc interlayer

The invention discloses a method for welding a steel/aluminum dissimilar material by adding a laser modified zinc interlayer. Before welding, a modified intermediate layer with regular holes is prepared on the surface of the zinc foil by using a pulse laser, then oxides and oil stains on the surfaces of a steel plate and an aluminum alloy are removed by using a nanosecond pulse laser, and then the steel plate and the aluminum alloy are fixed on a special clamp in a lap joint mode that the steel is arranged above the aluminum and the intermediate layer is the modified zinc foil and are fastened and clamped; the special clamp is provided with a hollow boss, lateral blowing protection can be conducted on a steel-aluminum interface, and finally a reliable and stable welding joint is obtained through the electric arc heat conduction technology. According to the method, the modified zinc middle layer is introduced, interface lateral blowing is carried out, the joint metallurgical reaction can be improved, the inter