Electromagnetic current coupling field assisted hybrid melting-brazing method for laser-TIG arc and equipment

Abstract

The invention discloses an electromagnetic current coupling field assisted hybrid melting-brazing method for a laser-TIG arc and equipment. In addition to the use of the welding zone, an alternating magnetic field is added to control properties of plasma formed through ionization of laser, arc and a raw material metal, thereby improving the laser utilization rate. Under the electric field assisted comprehensive effect, the weld melting depth is increased, and the assistant effect on the melting bath of the liquid-state brazing filler metal for laser-arc melting-brazing is realized through electromagnetic stirring and excitation and enhancement, thereby promoting the orderly flow of the liquid-state brazing filler metal and the rupture, wetting, spreading and proliferation of the liquid-state brazing filler metal on the surface of the high metal material, improving the full mixing of the liquid-state brazing filler metal and the base metal formed by melting the low-melting-point metal material, improving the uniformity of the components of the brazed weld, stabilizing the welding process, reducing welding defects, increasing the welding speed, improving the weld formation, optimizing the structure and performance of the brazed weld, and improving the quality of the brazed joint. Moreover, the equipment has the advantages of simple structure, flexible application, low cost, good effect and easy realization.

Description

technical field [0001] The invention relates to the field of brazing, in particular to a laser-TIG arc composite melting and brazing method and equipment assisted by an external magnetic field and an electric field. Background technique [0002] Laser welding is a high-efficiency and precise welding method that uses high-energy-density laser beams as energy for welding. Laser welding has the advantages of high energy density, deep penetration, high precision, and strong adaptability, and has been valued by various developed countries. Laser welding plays a very important role in the welding of some special materials and structures. It is applied in high-tech fields such as aerospace, electronics, automobile manufacturing, and nuclear power, and is increasingly valued by industrially developed countries; the application of laser brazing technology The high-density energy of the laser can achieve high regional localization, short-term heating, avoid thermal shock to heat-sensi...

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Problems solved by technology

[0008] The technical problem to be solved by the present invention is to reduce the utilization rate of the laser, affect the formation of the weld seam and even cause welding difficulties due to the shielding effect of the high-temperature plasma above the workpiece on the laser through absorption, scattering and refraction in the existing laser welding process, and Aiming at the problem that the existing laser brazing technology is not conducive to the uniform mixing of liquid molten pool metal and its full spread on the surface of the base metal and the interdiffusion with the base metal, an electromagnetic excitation device with a simple structure is used to control the welding area with an external alternating magnetic field. The characteristics of the plasma formed jointly by laser-arc-base metal ionization can improve the utilization rate of laser, and under the comprehensive action of electric field assistance, the weld penetration depth can be increased, and the liquid brazing of laser-arc melting and brazing can be improved. The auxiliary effect of electromagnetic stirring and electromagnetic excitation intensification in the molten pool promotes the orderly flow of liquid solder and its film breaking, wetting, spreading and diffusion on the surface of higher metal materials, and promotes the connection between liquid solder and metal materials with lower melting points. The molten base metal is fully mixed to improve the homogeneity of the brazing seam composition, stabilize the welding process, reduce welding defects, increase the welding speed, improve the weld shape, optimize the structure and performance of the brazed seam, and improve the quality of the brazed joint , give full play to the advantages of high efficiency and good quality of laser-arc hybrid welding, and the equipment has simple structure, flexible application, low cost, good effect and easy to implement

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