Rare earth magnesium alloy welding wire and preparation method thereof

Abstract

The invention discloses a rare earth magnesium alloy welding wire. The rare earth magnesium alloy welding wire is characterized by comprising 2.00-7.00 wt% of Gd, 0.02-2.00 wt% of Y, 0.30-0.80 wt% of Zr, 0.20-0.50 wt% of Sn, 0.02-0.18 wt% of Ag, 0.02-0.18 wt% of Er and the balance magnesium and inevitable impurities. According to the rare earth magnesium alloy welding wire, an Mg-Gd-Y-Zr alloy system capable of being strengthened through heat treatment is selected, and microalloy elements the Gd, the Y, the Zr, the Ag and the Sn are cooperatively added, so that the melt quality is improved, the welding wire quality is improved, and the defects of pore oxide inclusion and the like in a welding joint are reduced; the starting difficulty of a conical surface slippage system is reduced, the plastic deformation capacity of an alloy material is greatly improved by starting a potential slippage system, the extrusion deformation process of a welding wire is coordinated, and the welding wire quality is improved; and low-scale second-phase particles serve as heterogeneous nucleation factors, so that grains are refined, the alloy grain size is controlled, and the extrusion deformation capacity of the material is improved.

Description

technical field [0001] The invention relates to magnesium alloys, in particular to a rare earth magnesium alloy welding wire and a preparation method thereof. Background technique [0002] With the characteristics of low density, high specific strength and high specific stiffness, magnesium alloys are widely used in the fields of aerospace and transportation electronics. The demand for magnesium alloys is increasing, and the types of magnesium alloy materials are also increasing. [0003] At present, the connection method of magnesium alloy components with large size and complex structure mostly adopts welding method. However, the development of magnesium alloy welding wire materials is far behind that of magnesium alloy materials. This is because the processing method of industrial and semi-industrial magnesium alloy welding wire for magnesium alloy welding is extrusion processing. The close-packed hexagonal structure of magnesium alloys leads to high deformation resistanc...

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Problems solved by technology

Unlike aluminum alloys, the connection joints of magnesium alloy extruded wires are "false connections", which cannot achieve met

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