The invention discloses a multi-
physics field-assisted
electric resistance welding method for
dissimilar metal material. The multi-
physics field-assisted
electric resistance welding method for the
dissimilar metal material includes steps that exerting a magnetic-sound
composite field to a piece to be welded after performing oil removing and acid
pickling so as to activate the surface of the piece to be welded, carrying out
electric resistance welding on the
dissimilar metal under the magnetic-sound
composite field environment till solidifying the
metal at the weld joint, cooling to a
room temperature, and stopping exerting the
composite field to finish
welding the dissimilar
metal. The multi-
physics field-assisted electric resistance
welding method for the dissimilar
metal material has advantages that by means of the stirring and shock excitation effects of the magnetic-sound composite field for the melt metal at the weld joint in the
welding process, the primary
crystal size is effectively reduced, the
dislocation density in the
crystal is increased, the size of the
crystal grain tissue at the weld joint is refined, and the mechanical performance of the weld joint is improved; by means of the
magnetic field and high-frequency vibration, the energy generated by
elastic vibration is converted into the plastic flow energy of the metal material, the friction power of the welding interface and
heat energy, the energy needed for melting
base metal for the electric resistance welding can be lowered, and the energy is saved.