Abstract
The symmetrical nature in the case of wall fabrication by wire arc additive manufacturing (WAAM) has been observed in the literature, but it has not been studied as a source of knowledge. This paper focuses on the comparative study of three drop transfer methods employing Gas Metal Arc Welding (GMAW) technology, one of the most reported for the manufacture of aluminum alloys. The transfer modes studied are the well-known pulsed GMAW, cold arc, and the newer pulsed AC. The novelty of the last transfer mode is the reversal of the polarity during the preparation phase of the substance for droplet deposition. This study compares the symmetry of zero beads to determine the best parameters and transfer modes for wire arc additive manufacturing of 5 series aluminum. The pulsed transfer modes show values of 0.6 for symmetry ratio, which makes them more interesting strategies than cold arc with a symmetry ratio of 0.5. Furthermore, the methodology proposed in this study can be extrapolated to other materials manufactured with this technology.
Highlights
Additive manufacturing is one of the most rapidly growing topics in the manufacturing and engineering world today [1]
This paper focuses on the comparative study of three drop transfer methods employing Gas Metal Arc Welding (GMAW) technology, one of the most reported for the manufacture of aluminum alloys
The results are divided between the analysis of the images in the zero bead in the longitudinal direction and the transverse direction obtained from the three different modes
Summary
Additive manufacturing is one of the most rapidly growing topics in the manufacturing and engineering world today [1]. It consists of adding material layer by layer to manufacture bodies in three dimensions, which allows reducing the amount of material used [2]. WAAM technology uses a wire of metallic material as the material and arc welding as the heat source. The use of WAAM technologies has been progressively improving, especially in the last 10 years [3] In the past, it has had other designations, such as Solid Freeform Fabrication (SFF), Shape Metal Deposition (SMD), and even 3D Welding [4]
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