A method and device for electro-magnetic compound field cooperative laser cladding

Abstract

The invention discloses a method and device for laser cladding in cooperation with an electric-magnetic compound field. During the laser cladding process, an external electric field and an external magnetic field are simultaneously coupled to a workpiece, so that the conductive fluid in the molten pool area is subjected to electric-magnetic The synergistic effect of the magnetic recombination field produces a controllable Lorentz force to regulate the heat and mass transfer behavior in the laser cladding process. Solute elements or external hard phase distribution, improving the surface morphology of the cladding layer, etc. Electro-magnetic compound field cooperative laser cladding device includes laser, laser transmission channel, powder feeding head, permanent magnet or excitation device, workpiece holder, wire, low voltage and high current power supply, etc. The invention realizes the synergistic control of the molten pool caused by the laser by the electromagnetic compound field, and has the characteristics of strong regulation ability, flexible regulation type, wide application range and the like.

Description

technical field [0001] The invention belongs to the technical field of laser manufacturing, and in particular relates to a method and device for electro-magnetic compound field cooperative laser cladding. Background technique [0002] Laser cladding technology refers to the addition of different solute elements or hard phases to add cladding materials on the surface of the substrate. After laser irradiation, the cladding materials and the surface of the substrate are simultaneously melted to form a molten pool. After rapid solidification Forms a surface coating that is low dilution and metallurgically bonded to the substrate. Laser cladding technology is also the basis of laser combined additive manufacturing and laser 3D printing technology. The main characteristics of laser cladding are: less heat input and workpiece deformation; metallurgical bonding between the cladding layer and the substrate; less cladding material consumption, good cost performance; easy automation o...

AI Technical Summary

Problems solved by technology

[0003] (1) The adjustment of laser process parameters can only change the external heat transfer boundary of the molten pool of the cladding layer, and cannot control the movement direction of the fluid inside the molten pool. Therefore, it is difficult to control the tendency of the structure and performance of the solidified layer by simply adjusting the laser process parameters;

[0004] (2) Under the rapid solidification conditions of laser cladding, the cladding layer is very easy to form uneven solidification structures with different shapes, sizes and directions, and microscopic defects such as pores and inclusions in the cladding layer are often difficult to discharge in time and remain In the cladding structure, it seriously affects the quality of the cladding layer;

[0005] (3) Under the irradiation of high-energy laser beams, the molten pool of the cladding layer is strongly stirred, resulting in the disordered distribution of solute elements or hard phases, and it is difficult to achieve layering or gradient control in the single-layer laser cladding process

The alternating Lorentz force formed by the rotating magnetic field in the molten pool cannot form a unidirectional volume force inside the molten pool, and cannot have a tendency to affect the flow of the molten pool, and can only play a role in homogenizing the structure

Therefore, the existing pure magnetic field has a single form of regulation and control of the laser cladding process and its regulation ability is limited. The proposal of the present invention will effectively solve the above problems

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