Aluminum alloy workpiece additive manufacturing method implemented through friction stir welding

Abstract

The invention discloses an aluminum alloy workpiece additive manufacturing method implemented through friction stir welding. On the basis of an existing electric arc additive manufacturing aluminum alloy workpiece, the characteristic that aluminum alloy is soft in property is combined, after an aluminum alloy workpiece is manufactured from electric arc additives layer by layer, friction stir welding intensification treatment is conducted on each layer, and therefore, defects such as pass gaps, interlayer incomplete fusion, air holes and the like can be eliminated through friction stir weldingwhen each layer is manufactured. Compared with the pure electric arc additive manufacturing aluminum alloy workpiece, by means of the method, the structural state of the aluminum alloy workpiece obtained through additive manufacturing can be improved; the grains can be finer; second-phase grains are finer and are distributed more uniformly; and the dislocation density achieved in the aluminum alloy additive manufacturing workpiece is increased. Compared with existing friction stir welding intensification, grain refining and defect elimination are conducted on each layer of the workpiece so that the strength of the whole workpiece can be improved rather than only surface modification, namely surface intensification, is conducted.

Description

【Technical Field】 [0001] The invention belongs to the field of additive manufacturing, and in particular relates to a method for friction stir welding strengthened arc additive manufacturing of aluminum alloy workpieces. 【Background technique】 [0002] Arc additive manufacturing technology is based on the idea of ​​discrete and stacking manufacturing. The solid model of the part is established through three-dimensional design software. The arc is used as the forming heat source to melt the metal wire, and each layer is stacked according to the set forming path. The required three-dimensional solid parts are formed in a way. The direct forming technology using arc as the heat source has the advantages of low production cost and good mechanical properties. The parts formed by the arc additive manufacturing technology are composed of full weld metal with uniform chemical composition and high density. Compared with the integral forged parts, they have the advantages of high strength...

AI Technical Summary

Problems solved by technology

However, due to the low absorption rate of aluminum and aluminum alloys to laser light, the application of the present invention in aluminum and aluminum alloys is limited

Chinese patent CN 107803503 A proposes a method for preparing complex high-strength aluminum alloys using laser-induced arc additive manufacturing technology. This invention can additively form high-strength aluminum alloy parts with complex structures and shapes. The preparation of cored aluminum wire increases the cost and process complexity of additive manufacturing

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