Method for manufacturing a solid aluminum alloy structure through wire filling type additive

Abstract

The invention provides a method for manufacturing a solid aluminum alloy structure through a wire filling type additive, and belongs to the field of additive manufacturing. The method aims to solve the problems in the existing aluminum alloy laser filler wire additive manufacturing and electric arc additive manufacturing that the reflectivity of the aluminum alloy to the laser is high, the formingquality is poor caused by unstable electric arc, and the structure of a forming part is large caused by large heat input and the like. A laser-TIG composite heat source is adopted, and the laser andthe electric arc interact, so that on one hand, the heat input can be reduced, the structure of the forming part is refined, and the strength is improved; and on the other hand, the laser can stabilize the electric arc, so that the electric arc is more stable in the multi-layer multi-channel forming process, and the lap joint effect is optimized. According to the method, arc currents and inter-layer arc currents between adjacent welding beads are adjusted, so that the heat input in the continuous forming process is reduced, the appearance size of the obtained forming part is stable, crystal grains are refined, and the forming efficiency is remarkably improved compared with the control interlayer temperature and the interlayer residence time.

Description

technical field [0001] The invention belongs to the field of additive manufacturing, and relates to a wire-filling additive manufacturing method for a solid aluminum alloy structure. Background technique [0002] Aluminum alloy is an important lightweight material in aerospace, transportation and other fields. With the development of lightweight manufacturing, the lightweight structure and complex performance of aluminum alloy structures have become a major development trend. Additive manufacturing is a "bottom-up" layer-by-layer manufacturing technology with high manufacturing flexibility. The raw materials used for additive manufacturing are powder and wire. Due to the advantages of a wide range of wire materials, low cost, and high utilization rate, wire-filled additive manufacturing has become an important branch of additive manufacturing technology. [0003] Chinese patent CN 106392270 A discloses a method for manufacturing aluminum alloy multi-layer single-channel clo...

AI Technical Summary

Problems solved by technology

[0003] Chinese patent CN 106392270 A discloses a method for manufacturing aluminum alloy multi-layer single-channel closed structural parts by electric arc addition. The invention uses electric arc as heat source to melt aluminum alloy wire, which can greatly reduce production cost and shorten production cycle. When the heat source is large, the heat input is large, the deformation of the formed part is large and the grains are coarse, and the strength decreases with the increase of heat input

However, in this patent, a constant current is used for material addition, and the same interlayer temperature is used during the forming process, which greatly reduces the forming efficiency

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