Multi-physics field-assisted electric resistance welding method for dissimilar metal material

Abstract

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.

Description

technical field [0001] The invention relates to a multi-physics field-assisted resistance welding method for dissimilar metal materials, which belongs to the field of welding technology. Background technique [0002] The ever-changing level of science and technology and complex work procedures have put forward higher requirements for the comprehensive performance of various construction machinery components. In many cases, a single metal material can no longer meet the requirements of engineering use, and dissimilar metal welded components that integrate the properties of multiple materials have attracted people's attention. The welding of dissimilar metals can not only realize the comprehensive utilization of the excellent performance of each component material, but also greatly reduce the production cost and improve the economic benefits of the enterprise. Therefore, dissimilar metal welding technology is widely used in industries such as transportation, aerospace, petro...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to address the above existing problems and provide a multi-physics-field assisted resistance welding method for dissimilar metal materials. By applying a magnetic field and an ultrasonic composite field to the weldment while welding, the magnetic field component produces cutting and stirring effects on the crystal, and the ultrasonic wave It has crushing effect and supercooling nucleation effect on the crystal. Under the comprehensive action of the magnetic-acoustic compound field, part of the crystal grains are broken into fine grains, while the unbroken grains produce certain plastic deformation under the action of stirring, increasing The internal dislocation of the grains makes the grains significantly refined; the composite field improves the uniformity of the components at the weld to a certain extent, reduces the structural defects at the weld, and improves the mechanical properties of the weld; The impact crushing effect is used to treat the surface of the weldment to reduce the dirt on the surface of the weldment and the fusion of oxides into the weld to affect the performance of the weld

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