Eventos Anais de eventos
COBEM 2023
27th International Congress of Mechanical Engineering
Influence of TiO2 nanoparticle addition on submerged arc welding processes on carbon steel
Submission Author:
Maria Fernanda Coimbra Forcellini , SC
Co-Authors:
Maria Fernanda Coimbra Forcellini, Tiago Vieira da Cunha, LUIZ ELOI VIEIRA JUNIOR, Danielle Bond
Presenter: Maria Fernanda Coimbra Forcellini
doi://10.26678/ABCM.COBEM2023.COB2023-1995
Abstract
Submerged arc welding (SAW) is a metal bonding process which involves an electric arc between the base metal and a consumable wire electrode, under a layer of granular flux. The purpose of applying the flux is forming the electric arc, protecting the arc region from atmospheric contamination, reducing spatter, forming slag and, eventually, adding alloying elements to the weld. This is a widely used process for joining thick plates, and it can also be applied to deposit large coating areas, due to the possibility of using multiple wires and inserting other materials, even on the nanoscale, which provide differentiated electrical and mechanical characteristics to the weld bead. In this regard, the present study aims to investigate the influence of ceramic nanoparticles (NPs) addition on welds beads deposited by submerged arc welding process. The filler metal used was carbon steel wire, AWS A5.17 class EM12K, 2,4 mm diameter and the wire flux combination used was AWS F48A2-EM12K. Ceramic TiO2 nanoparticles were mixed with isopropyl alcohol in a solution, which was deposited on half of a 250 x 75 x 16 mm³ ASTMA 36 plate, allowing for the deposition of the weld bead in regions with and without nanoparticles using the same welding parameters. The weald beads were characterized by stereoscopy, X-ray fluorescence (XRF), and Vickers microhardness (HV0.3) tests. The chemical analysis of slags showed a successfully added of TiO2 nanoparticles to the weld beads during welding. The addition of NPs did not influence the stability and dilution of the process welding; however, they increased the width and penetration of the weld bead and reduced the microhardness of the weld. It is suggested that the lower thermal conductivity of the nanoparticles reduced the solidification speed of the bead, resulting in an increase in the width of the bead weld and coarse grains.
Keywords
Submerged arc welding, Ceramic nanoparticles, TiO2, Weld beads, Inclusions
