Uncertainty in forming geometric accuracy is one of the main factors limiting the application of Wire Arc Additive Manufacturing (WAAM), highlighting the importance of studying the variation in deposition size. In this paper, the profile of single beads based on CMT technology was studied and a theoretical model was developed to describe the correlation between variable parameters and geometric features. The accuracy of the model in predicting the geometric parameters was verified, and the accuracy errors of the deposition width and deposition height were 7.81 % and 4.82 %, respectively. Then, based on the optimized multi-layer stacking model, an appropriate strategy was proposed to address the phenomenon of layer-by-layer widening due to the changing formation conditions of subsequent sediment layers during the multi-layer single-bead (MLSB) deposition process. The comparative experimental results demonstrated that following the proposed deposition strategy can effectively alleviate this phenomenon and achieve stable deposition geometric parameters. To further verify the stability of the deposition process, six-layer deposition experiments were performed and the actual deposition characteristics of each layer were analyzed, which showed good agreement with the theoretical predictions. The proposed scheme was successful in predicting the sedimentation height with an overall accuracy of 9.4 %.

中文翻译：

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基于多层单珠部件线材和电弧增材制造理论模型的层叠加策略

成形几何精度的不确定性是限制电弧增材制造（WAAM）应用的主要因素之一，凸显了研究沉积尺寸变化的重要性。本文研究了基于CMT技术的单珠轮廓，并建立了一个理论模型来描述变量参数和几何特征之间的相关性。验证了模型预测几何参数的准确性，沉积宽度和沉积高度的精度误差分别为7.81%和4.82%。然后，基于优化的多层堆积模型，针对多层单珠（MLSB）沉积过程中后续沉积物层形成条件变化导致的逐层加宽现象，提出了适当的策略。过程。对比实验结果表明，遵循所提出的沉积策略可以有效缓解这种现象并获得稳定的沉积几何参数。为了进一步验证沉积过程的稳定性，进行了六层沉积实验并分析了每层的实际沉积特性，结果与理论预测吻合良好。所提出的方案成功地预测了沉降高度，总体精度为 9.4%。