Research On Laser-Arc Hybrid Additive Manufacturing Of Aluminum Alloy Thin-wall

Structural samples in different fields have been developing towards light-weight while pursuing large-scale and complex with the development of science and technology and the demand of popularization and application to reduce costs,save energy and expand application fields.Light alloys,mainly aluminum alloys,have attracted much attention in the manufacturing field due to the low density,high specific strength and good fracture toughness.Compared with the traditional casting method,laser additive manufacturing technology or arc additive manufacturing with laser or arc as the heat source has been widely used in aerospace,rail transit,automobile manufacturing and other fields due to its advantages of high forming efficiency,high forming precision and unrestricted forming freedom.On this basis,the laser and arc heat sources are combined.This technology can make better use of energy and form better quality prototype of forming structure.In this paper,aluminum alloy 6061 is used as substrate material,aluminum alloy 4043 with diameter of 1.2 mm is used as wire feed material,JK701 H Nd:YAG pulse laser and Dynasty 200 DX arc welding machine are selected,laser-arc hybrid additive manufacturing was used to optimize the process and thin-wall forming experiments,and compared with the thin-wall prepared by arc additive manufacturing.(1)The laser power,arc current,wire feeding speed,scanning speed,preheating temperature and tungsten electrode height which can be used to prepare thin-wall were determined by single factor experiment method with aspect ratio and forming efficiency as optimization criteria;(2)The thin-wall of laser-arc hybrid additive manufacturing was fabricated by using optimized process parameters and reducing arc current layer by layer;(3)The macroscopic morphology,microstructure and mechanical properties of the thin-wall were compared with arc additive manufacturing.