Dissimilar metal electric arc melting-brazing method based on biting assistance

The invention discloses a dissimilar metal electric arc melting-brazing method based on biting assistance. The method comprises the following steps that 1, two dissimilar metal base materials to be welded are fixed to a welding platform to be assembled into a butt joint; 2, the relative positions of a stirring head, an electric arc welding gun and a welding wire are adjusted; 3, the wire feeding speed of a welding wire is 680-1500 mm/min, the welding current of an arc welding gun is 70-110 A, the arc length is 2-5 mm, the rotating speed of a stirring head is 1300-5400 r/min, the welding speedis 44-150 mm/min, argon is adopted as protective gas, and the flow of the protective gas is 8-20 L/min; 4, the welding platform drives the to-be-welded metal base metal to move, the stirring head vertically feeds towards the assembly gap, the stirring head cuts the to-be-welded face of the to-be-welded metal base metal to generate chippings, and the chippings are dispersedly distributed in the molten pool under the rotati