Veiga Suárez, Fernando
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Veiga Suárez
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Fernando
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Ingeniería
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Publication Open Access Wire arc additive manufacturing of invar parts: bead geometry and melt pool monitoring(Elsevier, 2022-02-15) Veiga Suárez, Fernando; Suárez, Alfredo; Aldalur, Eider; Artaza, Teresa; Ingeniería; IngeniaritzaAdditive manufacturing processes using the direct energy deposition method, one of which is the Wire Arc Additive Manufacturing (WAAM), have gained much attention in the scientific community over the last decade. The application of WAAM to Invar, an iron-nickel and manganese alloy, with a low amount of chromium carbon, also called FeNi36 or Nivarox has been the subject of various reports due to its challenging nature. This paper utilizes and unifies research material previously investigated in this technology, taking a new approach based on the study of symmetrical phenomena that guarantee the quality of the process. On the one hand, a method of analysis of the geometry of the manufactured wall is presented based on its symmetrical quality which guarantees the maximum use of material and, on the other hand, the monitoring of the symmetry of the melting pool utilizing thermography techniques.Publication Open Access Effect of the metal transfer mode on the symmetry of bead geometry in WAAM aluminum(MDPI, 2021) Veiga Suárez, Fernando; Suárez, Alfredo; Aldalur, Eider; Bhujangrao, Trunal; Ingeniería; IngeniaritzaThe 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 deter-mine 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.