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Analysis of helium used as protective gas in Laser Metal Deposition of Ti6Al4V highly reactive material

机译：Ti6Al4V高反应材料激光金属沉积中用作保护气的氦气分析

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摘要

Laser Material Deposition (LMD) is an additive manufacturing near-net-shape process. Metal powder particles are molten by means of a laser heat source and added to a substrate creating geometries. This technology offers the possibility of generating coatings, repairing damaged high-added-value parts, and manufacturing components with complex 3D geometries. Many industrial sectors, including aerospace and die and mold industries, are interested in this process due to its capabilities and the wide range of materials that can be used with it.Previous works aimed to develop a protective gas module to be able to process highly reactive materials without the necessity of a complete inert atmosphere inside the machine. Additionally, the influence of a mixture of argon and helium on the LMD process for other non-highly reactive alloys was evaluated. Hence, the present work aims to broaden the understanding of how the combination of these two factors may affect the LMD process, combining these previous studies and evaluating the phenomenon for a highly reactive alloy like Ti6Al4V. The study involves the melt-pool temperature measurement and characterization of the deposited clads variating not only the composition of the protective gas but also the flow rates.
机译：激光材料沉积（LMD）是一种添加剂制造近净形状的方法。金属粉末颗粒借助于激光热源熔融，并添加到基材上产生几何形状。该技术提供了产生涂层，修复损坏的高附加值零件以及带复杂的3D几何形状的制造部件的可能性。许多工业部门，包括航空航天和模具和模具行业，由于其能力和可与其一起使用的广泛材料，对此过程感兴趣。另一种工程旨在开发保护气体模块，以便能够处理高度反应性材料没有机器内完全惰性气氛的必要性。另外，评价氩气和氦混合物对其他非高活性合金的LMD方法的影响。因此，本作者旨在拓宽对这两个因素的组合如何影响LMD过程的理解，使这些先前的研究结合起来并评估高反应性合金的现象，如Ti6Al4V。该研究涉及熔融池温度测量和沉积的包层的表征，不仅变形了保护气体的组成，还变得流量。

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