• Santos, Telmo G.
• Gouveia, Francisco
• Oliveira, João Pedro

Abstract

Publisher Copyright: © 2022 The Author(s) This activity has received funding from the European Institute of Innovation and Technology (EIT) – Project Smart WAAM: Microstructural Engineering and Integrated NonDestructive Testing. This body of the European Union receives support from the European Union’s Horizon 2020 research and innovation program. ; In this work we explore the wire and arc additive manufacturing (WAAM) process scale limits by using a wire diameter of 250 µm and about 2 mm stickout. This WAAM variant, named µ-WAAM, aims at competing with laser powder bed fusion technology, by enabling the fabrication of smaller parts with significantly higher deposition rates. The main issues of descaling the WAAM process are discussed and an acceptable parameter window to fabricate thin walls is presented. Several depositions were successfully performed with ASTMA 228 steel using a wire feed speed ranging from 75 to 90 mm/s, travel speed from 7 to 10 mm/s, a current intensity of 16 A RMS and power of ≈ 35 W RMS. ; publishersversion ; published

Topics

• Deposition
• impedance spectroscopy
• steel
• selective laser melting
• wire