Electromagnetic auxiliary laser welding method for pre-arranged powder on surface of aluminum alloy

Abstract

The invention relates to the technical field of aluminum alloy laser welding, and discloses an electromagnetic auxiliary laser welding method for pre-arranged powder on the surface of an aluminum alloy. According to the method, alloy powder is pre-arranged at the butt joint of an aluminum alloy flat plate, meanwhile, an electromagnetic field is additionally arranged to assist laser welding, and the method aims to improve the laser welding quality of the aluminum alloy. Compared with the prior art, the method has the advantages that the problem that the pore defect is prone to being generated due to the fact that powder is pre-arranged through a chemical bonding method is solved; meanwhile, based on the magnetohydrodynamic principle, the electromagnetic field is additionally arranged to change the flow of a molten pool, the magnetic stirring effect is generated on liquid metal, crystal grains are refined, and the weld joint structure is improved; and in the laser welding process, a transverse magnetic field generation device can generate a steady-state magnetic field at the molten pool, the steady-state magnetic field is coupled with an electric field generated by a direct-current power supply, the molten pool is subjected to stable electromagnetic force, so that the weld joint is effectively prevented from collapsing, the mechanical property of a joint is improved, and therefore the reliability of an aluminum alloy welding structural part for aviation is improved.

Description

technical field [0001] The invention relates to the technical field of laser welding, in particular to an electromagnetic-assisted laser welding method for presetting powder on the surface of an aluminum alloy. Background technique [0002] Due to its low density, high specific strength, and good corrosion resistance, aluminum alloys are widely used in the fields of automobiles, ships, chemical industry, and aerospace. Based on the physical properties of aluminum alloys such as high thermal conductivity and large expansion coefficient, laser welding is often used in the industry to weld aluminum alloy structures. Laser welding concentrates high-density energy on the spot, so it has the advantages of energy concentration and high welding efficiency. [0003] However, due to the special physical and chemical properties of aluminum alloys, when welding aluminum alloys by laser, if the welding parameters are not properly controlled, defects such as pores, shrinkage, and undercu...

AI Technical Summary

Problems solved by technology

Among them, although the chemical bonding method has a lower powder loss, due to the use of various binders, although some measures such as drying have been taken, defects such as pores are still very easy to occur during the laser welding process. The addition of binders will also have varying degrees of adverse effects on the composition of the weld

Images