Method and device for performing electric magnetization resistance welding-braze welding compounding on dissimilar materials

Abstract

The invention discloses a method and a device for performing electric magnetization resistance welding-braze welding compounding on dissimilar materials by assistance of an applied magnetic field. In the process of performing resistance welding-braze welding on the dissimilar metal material, a liquid solder is subjected to auxiliary electromagnetic stirring and ordered control, and the molten liquid solder is subjected to the reinforced booster action of electromagnetic stirring and electric magnetization by using an external applied alternating magnetic field which is generated by a magnet exciting coil in a welding area so as to promote directional flow of the liquid solder, and rupture of membranes, wetting, spreading and diffusion of the liquid solder on the surface of the metal material with a higher melting point, promote the liquid solder and a base metal which is molten by the metal material with a lower melting point to be mixed fully, promote interdiffusion of elements and compositions between the solder and the base metal and alloying between the two, improve uniformity of compositions of a soldered seam, reduce the weld defects, optimize the texture and the performance of the soldered seam, and improve the resistance soldered joint; and the device has the advantages of simple structure, flexible application, lower cost, good effect, and easy implementation.

Description

technical field [0001] The invention relates to an electromagnetic excitation resistance fusion-brazing composite welding method and equipment assisted by an external magnetic field. Background technique [0002] Brazing technology uses welding wire with a melting point lower than that of the base metal as the welding material (brazing material). During welding, the welding wire (brazing material) melts but the base material does not melt, so as to realize the connection between the same or dissimilar metal materials. Resistance brazing is a brazing method that uses resistance heat generated by current passing through the weldment or a heating block in contact with the weldment to heat the weldment and melt the solder. During brazing, a certain pressure should be applied to the braze. The basic principle of resistance brazing is the same as that of resistance welding. Compared with other brazing methods, it has the advantages of rapid heating, high productivity, and small he...

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Problems solved by technology

[0007] The technical problem to be solved by the present invention is to aim at the existing electric resistance brazing technology, because the liquid molten pool formed by the solder has a short retention time, which is not conducive to the sufficient spreading of the liquid solder on the surface of the base metal and mutual diffusion with the base metal, and the joint is easy to produce Defects and other problems, use the electromagnetic excitation resistance melting-brazing composite welding method and equipment of dissimilar materials assisted by an external magnetic field. The solder is assisted by electromagnetic stirring and orderly control, and the molten liquid solder is supplemented by electromagnetic stirring and electromagnetic excitation strengthening to promote the directional flow of the liquid solder and its film breaking, wetting, Spreading and diffusion, promote the full mixing of the liquid solder and the molten base metal of the metal material with a lower melting point, promote the interdiffusion and alloying of elements and components between the solder and the base metal, improve the uniformity of the solder joint components, and reduce the welding defects, optimize the structure and performance of the brazing seam, improve the quality of the resistance brazing joint, and the equipment has a simple structure, flexible application, low cost, better effect, and is easy to implement

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