Ruiz Jose Exequiel, Cortina Magdalena, Arrizubieta Jon Iñaki, Lamikiz Aitzol
Department of Mechanical Engineering, University of the Basque Country, Plaza Torres Quevedo 1, 48013 Bilbao, Spain.
Materials (Basel). 2018 Aug 9;11(8):1388. doi: 10.3390/ma11081388.
The use of the Laser Metal Deposition (LMD) technology as a manufacturing and repairing technique in industrial sectors like the die and mold and aerospace is increasing within the last decades. Research carried out in the field of LMD process situates argon as the most usual inert gas, followed by nitrogen. Some leading companies have started to use helium and argon as carrier and shielding gas, respectively. There is therefore a pressing need to know how the use of different gases may affect the LMD process due there being a lack of knowledge with regard to gas mixtures. The aim of the present work is to evaluate the influence of a mixture of argon and helium on the LMD process by analyzing single tracks of deposited material. For this purpose, special attention is paid to the melt pool temperature, as well as to the characterization of the deposited clads. The increment of helium concentration in the gases of the LMD processes based on argon will have three effects. The first one is a slight reduction of the height of the clads. Second, an increase of the temperature of the melt pool. Last, smaller wet angles are obtained for higher helium concentrations.
在过去几十年里，激光金属沉积（LMD）技术作为一种制造和修复技术，在模具和航空航天等工业领域的应用越来越广泛。在LMD工艺领域开展的研究表明，氩气是最常用的惰性气体，其次是氮气。一些领先企业已开始分别使用氦气作为载气、氩气作为保护气。因此，由于缺乏关于气体混合物的知识，迫切需要了解使用不同气体如何影响LMD工艺。本工作的目的是通过分析沉积材料的单道轨迹来评估氩气和氦气混合物对LMD工艺的影响。为此，特别关注熔池温度以及沉积熔覆层的表征。基于氩气的LMD工艺气体中氦气浓度的增加将产生三个影响。第一个是熔覆层高度略有降低。第二个是熔池温度升高。最后，对于较高的氦气浓度，会获得较小的润湿角。
