Abstract
Additive manufacturing has gained relevance in recent decades as an alternative to the manufacture of metal parts. Among the additive technologies, those that are classified as Directed Energy Deposition (DED) are characterized by their high deposition rate, noticeably, Wire Arc Additive Manufacturing (WAAM). However, having the inability to produce parts with acceptable final surface quality and high geometric precision is to be considered an important disadvantage in this process. In this paper, different torch trajectory strategies (oscillatory motion and overlap) in the fabrication of low carbon steel walls will be compared using Gas Metal Arc Welding (GMAW)-based WAAM technology. The comparison is done with a study of the mechanical and microstructural characteristics of the produced walls and finally, addressing the productivity obtained utilizing each strategy. The oscillation strategy shows better results, regarding the utilization rate of deposited material and the flatness of the upper surface, this being advantageous for subsequent machining steps.
Highlights
Additive Manufacturing (AM) is a new production concept that has generated increasing interest over the last ten years
According to the standard terminology for AM by ASTM (ASTM F2792), AM technologies for metal components have been classified into four categories, one being the Directed
The results revealed that the oscillating path parameterization method is as capable of producing the final geometry as the more commonly implemented overlapping strategy
Summary
Additive Manufacturing (AM) is a new production concept that has generated increasing interest over the last ten years. A transformation has been promoted in the way that structurally complex parts can be manufactured with unrivaled design freedom [1]. Each AM technology consists of a particular combination of a heat source, feedstock and motion system, making it suitable for numerous applications. Energy Deposition (DED) [2]. DED by definition is “an additive manufacturing process in which focused thermal energy is used to fuse materials by melting as they are being deposited” [3]. Amongst the DED technologies are wire-feed processes and powder-feed processes [4]. The ability to use wire as a feedstock, compared to powder, offers a reduction in price per kilogram and a high material usage efficiency
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