Abstract
Gas tungsten arc welding process are widely used for cladding and surface repairing. In oil & Gas industry, Ni-Cr alloys stand out for severe corrosion associated to high temperature conditions. In this study, cold-wire and hot-wire GTAW tests conciliated with dynamic wire feeding were carried out to evaluated Inconel 625 deposits. Single beads and overlay samples were deposited over ASTM A36 low carbon steel plates with 9,35 mm thick. The experiments were conducted with a welding current of 170 A and, for hot-wire tests, 70 A. The wire feed speed was set in 25 mm/s and, for sample with dynamic wire feeding, the wire oscillation frequency was 18 Hz. Arc length, travel speed was the same for all conditions. The results shown that samples carried out with dynamic wire feeding for both conditions (cold-wire and hot-wire) had lower penetration and greater reinforcement, compared to samples with conventional wire feeding. Furthermore, the weld bead width reduced when dynamic wire feeding was used. Regarding the dilution, samples carried out with dynamic wire feeding shown lower dilution for cold-wire and hot-wire tests, even though, the hot-wire samples shown greater dilution than cold-sire samples. Spectroscopy was also done to evaluate the percentage of Fe in the overlay samples surface. The cold-wire samples shown less Fe in the surface than hot-wire samples, but tests carried out with dynamic wire feeding result in less Fe on surface for both conditions.
Keywords: hot-wire; inconel 625; dynamic wire feeding; GTAW; cladding.
Referência:
PIGOZZO, I. O.; SILVA, R. H. G.; VIVIANI, A. B.; MEURER, G.. Comparison of hot-wire and cold-wire GTAW with dynamic wire feeding of Inconel 625 deposits for cladding applications. Proceedings of the ROG.e, Rio de Janeiro, RJ, Brazil, 2024.