Bimetal bushing as well as preparation method and application thereof

The invention provides a bimetallic bushing and a preparation method and application thereof, and relates to the technical field of brazing. Specifically, the preparation method comprises the following steps: overlaying a copper-based alloy and a tin-based babbitt metal on the surface of a steel substrate; wherein the phase difference of the welding frequency of the copper-based alloy and the tin-based babbitt metal is 180 degrees. According to the method, digital control is conducted through the two welding machines, two kinds of alloy are welded in a mode of staggering current wave crests, heat of two welding arcs supports each other, welding preheating can be reduced, and the effects of reducing pores of a surfacing layer and enhancing the welding quality can be achieved; and meanwhile, homogenization of the two alloys can be achieved, generation of intergranular brittle-hard phases is inhibited, and the service life of the bushing is prolonged. According to the preparation method, the heat input is low, t