Study On Wire And Arc Additive Manufacturing Forming Process Of 5356 Aluminum Alloy

Compared with other additive manufacturing technologies,arc additive manufacturing technology has unparalleled advantages in terms of forming efficiency,material utilization,and part structure size,and has broad application prospects in aviation,aerospace,and shipbuilding fields.In this paper,the arc forming additive forming process of 5356 aluminum-alloy was studied.Results Surface:The forming process parameters had certain influence on the appearance and forming quality of the formed samples.Finally,a reasonable combination of process parameters was obtained,in which the welding current is 180A,The wire feeding speed is 8.1 m/min,the scanning speed is 18 mm/s,the scanning pitch is 3 mm,the layer height is 2 mm.The shape of the finally formed sample was good and there was no collapse.Through the study of the microstructure and tensile properties.The results showed that the Wire+Arc additive manufactured 5356-aluminum alloy exhibits good forming quality and excellent metallurgical bonding property,and no obvious defects were found.The microstructure of the sample consisted mainly of??Al?and??Al₃Mg₂?.The element distribution uniformity was improved after 420?x18h homogenization annealing.The strength and toughness of the 5356-aluminum alloy were improved at the same time after the homogenization and annealing.Necking at the fracture position was obviously for the tensile specimen at room temperature.The fracture surface of the as-deposited tensile samples was relatively flat,but it is obviously undulated after homogenization annealing.The surface of the fracture was distributed with fine and uniform dimples,and the dimples were finer after homogenization annealing.Finally,the influence of auxiliary external force on the microstructure and properties of the formed samples was studied.The results showed that by applying the auxiliary external force,the surface of the forming bead becomes flat,and the melting height of the bead was significantly reduced.Meanwhile,due to the plastic deformation of the bead,the defects such as the internal pores of the sample were also deformed.The internal porosity was reduced.Under the external force,the internal grain size of the sample changed,compared with the direct forming sample,the tensile strength and yield strength of the auxiliary external force forming specimen were improved,but the plasticity of the samples was significantly reduced.