Effect of the Heat Input on Wire-Arc Additive Manufacturing of Invar 36 Alloy: Microstructure and Mechanical Properties

Abstract Invar, also known as FeNi36, is a material of great interest due to its unique properties, which makes it an excellent alternative for sectors such tooling in aeronautics and aerospace. Its manufacture by means wire arc additive manufacturing (WAAM) technology could extend use. This paper aims evaluate the comparison two most widespread WAAM technologies: plasma welding (PAW) gas metal (GMAW). based on analysis wall geometry, metallography, mechanical properties produced both technologies. The results show slight increase toughness elongation before fracture worse tensile strength data case PAW, with average values 485 MPa ultimate (UTS), 31% 475 MPa, 40% GMAW respectively. All gathered from possibility successful Invar novelties presented this allow us establish relationships between thermal input process itself metallographic produced.