Aluminum alloy additive manufacturing process based on cold metal transfer welding technology
The 5183 aluminum alloy exhibits exceptional specific strength,specific stiffness,and corrosion resistance,making it a widely applied material in aerospace and transportation industries.Utilizing additive manufacturing technology for processing 5183 aluminum alloy components offers notable advantages in terms of production cycle and cost reduction.However,current aluminum alloys produced using the wire arc additive processes suffer from issues such as low surface accuracy and poor mechanical properties.This study focuses on the fabrication of thin-walled 5183 aluminum alloy components using cold metal transfer additive manufacturing.Through experimentation,optimal welding parameters were determined,to investigate their influence on morphology and mechanical performance of manufactured additives.Findings reveal that at a welding speed of 7 mm/s and a welding current of 110 A,the weld seam exhibits a smooth surface,with a forming coefficient λ close to 1,representing the optimal welding parameters within the specified range.Microstructural analysis indicates that the middle and lower regions of the deposited 5183 aluminum alloy predominantly feature fine equiaxed grains,while interlayer grains display varying complexities in size,type,and orientation,accompanied by dendrite fragmentation and grain coarsening phenomena.The average tensile strength of the selected samples in the horizontal and vertical directions is 245.2 and 211.7 MPa respectively,with fracture elongation rates of 19.5%and 10.3%,respectively,and the plasticity is relatively poor in the vertical direction.Tensile fractures occur at interlaminar bonding areas,revealing numerous fine microcracks along the sidewall of the pores,which suggests that pores and cracks compromise the load-bearing capacity of the aluminum alloy,exacerbating the propensity for cracking of the components.
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