A flux-assisted laser welding method

Abstract

The invention relates to a soldering flux assisted laser welding method, and belongs to the technical field of laser material machining. The method includes the steps that on the basis of a conventional laser welding process, a layer of soldering flux with the thickness larger than 5 mm is placed on the back face of a welding line zone of a to-be-welded workpiece, laser beams enter the workpiece from the front face in a perpendicular or inclined manner, and the workpiece is subject to laser welding; during welding, the energy of lasers transmitted from anatexis small holes and heat of a molten bath are transmitted to heat and melt the soldering flux, the back face of the molten bath is covered with the molten soldering flux, supporting to the molten bath is formed, and shaping of the back face of a welding line is improved; and meanwhile, air can be isolated, and the protection effect on the back face of the welding line is achieved. Meanwhile, the molten soldering flux serves as an assisting heat source, radiating can be slowed down, the welding fusion depth is increased, the flowing state of the molten bath is improved, and defects of splashing, air holes, insufficient melting and the like are effectively reduced.

Description

technical field [0001] The invention belongs to the technical field of laser material processing, and in particular relates to a flux-assisted laser welding method. Background technique [0002] With the increasingly large-scale and high-parameterization of transportation, energy, nuclear power, aviation, aerospace and other industrial equipment, the application of thick (ultra-thick) plate welding structures is becoming more and more extensive, and more and more requirements are put forward for welding deformation and joint quality. higher requirements. Gas metal shielded welding and submerged arc welding are mainly used for this. However, large welding grooves, low welding efficiency, high heat input and large deformation are difficult to meet the needs. At the same time, due to the shallow heat penetration depth of the arc, single-sided welding and double-sided forming cannot be realized for medium and thick plates. [0003] Laser welding has the advantages of high ener...

AI Technical Summary

Problems solved by technology

Although these methods have solved the problem of penetration welding of some thick steel plates, they cannot completely solve the problems of penetration and poor forming of laser welding.

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