Laser cladding: A high-speed-imaging examination of powder catchment efficiency as a function of the melt pool geometry and its position under the powder stream

IF 1.7 4区 工程技术 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY
Daniel Koti, John Powell, Himani Naesstroem, Chiara Spaccapaniccia, K. T. Voisey
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引用次数: 0

Abstract

This paper provides quantitative information about the paths taken by blown powder particles during laser cladding. A proportion of the powder is “wasted” by bouncing off the solid areas surrounding the melt pool. This wastage reduces the productivity and profitability of the process. In this paper, specially developed software was used to analyze high-speed imaging videos of the cladding process, to monitor the directions of powder particle flight toward and away from the melt pool area. This information has been correlated to the geometry and position of the melt pool zone for three different cladding techniques: single track cladding (A tracks), standard overlapping track cladding (AAA cladding), and a recently developed technique called ABA cladding. The results show that the melt pool geometry, and particularly the overlap between the melt pool and the incoming powder stream, has a strong influence on powder catchment efficiency. ABA cladding was found to have considerably better powder catchment efficiency than standard AAA cladding and this improvement can be explained by consideration of the geometries and positions of the melt pools and surrounding solid material in each case. As powder costs are an important factor in industrial laser cladding, the adaption of the ABA technique, and/or control of pool/powder stream overlap (e.g., by making the powder stream not coaxial with the laser beam), could improve the profitability of the process.
激光熔覆:作为熔池几何形状及其在粉末流下位置的函数的粉末收集效率的高速成像检查
本文提供了激光熔覆过程中吹散粉末颗粒路径的定量信息。一部分粉末在熔池周围的固体区域反弹而“浪费”了。这种浪费降低了流程的生产率和盈利能力。本文采用专门开发的软件对熔覆过程的高速成像视频进行分析,监测粉末颗粒向熔池区域和远离熔池区域的飞行方向。这些信息与三种不同覆层技术的熔池区域的几何形状和位置相关:单轨道覆层(A轨道),标准重叠轨道覆层(AAA覆层)和最近开发的称为ABA覆层的技术。结果表明,熔池的几何形状,特别是熔池与入射粉末流之间的重叠,对粉末集集效率有很大影响。发现ABA包层比标准AAA包层具有更好的粉末集集效率,这种改进可以通过考虑每种情况下熔池和周围固体材料的几何形状和位置来解释。由于粉末成本是工业激光熔覆的一个重要因素,采用ABA技术和/或控制熔池/粉末流重叠(例如,通过使粉末流与激光束不同轴)可以提高工艺的盈利能力。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
CiteScore
3.60
自引率
9.50%
发文量
125
审稿时长
>12 weeks
期刊介绍: The Journal of Laser Applications (JLA) is the scientific platform of the Laser Institute of America (LIA) and is published in cooperation with AIP Publishing. The high-quality articles cover a broad range from fundamental and applied research and development to industrial applications. Therefore, JLA is a reflection of the state-of-R&D in photonic production, sensing and measurement as well as Laser safety. The following international and well known first-class scientists serve as allocated Editors in 9 new categories: High Precision Materials Processing with Ultrafast Lasers Laser Additive Manufacturing High Power Materials Processing with High Brightness Lasers Emerging Applications of Laser Technologies in High-performance/Multi-function Materials and Structures Surface Modification Lasers in Nanomanufacturing / Nanophotonics & Thin Film Technology Spectroscopy / Imaging / Diagnostics / Measurements Laser Systems and Markets Medical Applications & Safety Thermal Transportation Nanomaterials and Nanoprocessing Laser applications in Microelectronics.
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