Laser welding system and method

Abstract

The invention discloses a laser welding system and method. The system comprises two transversely-rotating magnetic field generators located on the two sides of a welding seam of a welding piece and an ultrasonic generator located above the welding seam of the welding piece. The transversely-rotating magnetic field generators and the ultrasonic generator are located on the same longitudinal face. According to the laser welding system, overlaying of transversely-rotating magnetic fields and an ultrasonic field can be achieved, and in the molten pool solidifying process, Lorentz force and longitudinal waves are exerted in the horizontal direction and the vertical direction to enable a molten pool to be sufficiently stirred in all the directions, so that the solidified welding seam is made to obtain more fine crystal grains; under the composite effect of the ultrasonic field and the electromagnetic fields, the defect that the range of the ultrasonic treatment effect is small can be effectively overcome, the refining effect of electromagnetic stirring over a structure can also be reinforced through the ultrasonic field cavitation effect, and great help is achieved for refining of the molten pool solidified structure; and through involving of the composite field, the crystal grains of all the positions of the molten pool are refined, generation of air holes is reduced, and the ranges of all welding parameters can be optimized.

Description

technical field [0001] The invention relates to the field of welding, in particular to a laser welding system and method. Background technique [0002] As a big manufacturing country in my country, laser welding is widely used in industrial manufacturing fields, such as automobile manufacturing, construction industry and military fields. Laser welding is the process of using the high instantaneous energy density of the laser to transform the metal material into a molten state and then cooling and solidifying the process through the heat energy transfer and action of the laser beam and the metal material. However, due to the excessive laser power, the keyhole in the welding process The change of shape, the flow of metal vapor, and the generation of splash will all affect the grain structure of molten metal when it solidifies, and then affect the weld formation. [0003] At present, in order to improve the quality of welds, the following four methods are generally used: [0...

AI Technical Summary

Problems solved by technology

Some active agents (Cr 2 o 3 ) will cause metal inclusions in the fusion zone, and the tensile strength of the laser welded joint with the addition of active agent is lower than that of the laser welded joint without active agent.

[0012] In the prior art, any one of the above four methods is generally used to improve the quality of the weld. Each method has its obvious disadvantages, and the effect of improving the quality of the weld is not significant

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