Aplicabilidade da manufatura aditiva por deposição a arco (MADA) por CMT para produção de flange de aço para conexão de descarga de caminhão tanque de cloro de estação de tratamento de água

Abstract

Components used in water treatment plants operate in potentially corrosive environments, which can lead to deterioration and failure. Therefore, the exploration of manufacturing processes capable of producing more effective components is becoming increasingly necessary. In this context, this study evaluated the applicability of Wire Arc Additive Manufacturing (WAAM), using the Cold Metal Transfer (CMT) process, for the production of a flanged pipe intended for unloading a chlorine tanker truck. Initially, flanges were manufactured with different bead spacings, and the influence of the shielding gas flow rate on pore formation was analyzed. Subsequently, the final flange and a pipe were produced for mechanical and corrosion testing, as well as microstructural analysis; results were compared with a WAAM-GMAW component and a conventional pipe. The results showed that the flange with a 12 mm spacing exhibited better geometric integrity, while a flow rate of 20 L/min was the minimum required to prevent internal porosity. Microstructural analysis identified ferrite and pearlite in the lower and central regions, in addition to widmanstätten ferrite in the upper region. The manufactured pipe demonstrated superior yield strength and tensile strength compared to those obtained via WAAM-GMAW. In corrosion tests, samples produced by CMT exhibited higher resistance compared to both the conventional pipe and the WAAM-GMAW samples. It is concluded that the CMT process is a suitable alternative for manufacturing components intended for corrosive environments.