Abstract
ABSTRACT Large-scale thin-walled structures made by directed energy deposition-arc (DED-arc) have various applications in the aerospace industry, while the challenge at the moment is controlling residual stresses and deformations. The deposition path sequence determines the order sequence of heat input and thermal stresses. This study uses experimental methods and finite element analysis to examine the effects of path patterns on DED-arc thin-walled structures. Results indicate that stress distribution in the first few layers was significantly influenced by deposition path pattern. Substrate deformation was also affected by path pattern, and minimum deformation can be achieved by optimizing the sequence of the deposition path. Additionally, initial substrate preheating reduces substrate deformation and mitigates the impact of deposition path on stress distribution. This study provides valuable insights for optimizing deposition path design and preheating strategies to enhance the structural integrity of thin-walled parts produced by DED-arc processes.
Published Version
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