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Abstract
This paper compares the microstructure and corrosion performance of Alloy 625 weld cladding deposited using Top Wire Feeding GTAW (TWF-GTAW) and Plasma Transferred Arc with Powder (PTA-P). The analysis indicated higher dilution values for TWF-GTAW, with 27.5% for a single layer, whereas in PTA-P, the dilution was 5.1% for a single layer. Both single and double layers presented similar dilution for the different welding conditions because the second deposited layer only partially melted the first layer. The Fe content was higher in TWF-GTAW compared with PTA-P welding. Micrographic characterization showed the formation of micropores in welding using the PTA-P process, with a predominance of Laves phase formation as an interdendritic precipitate. In contrast, TWF-GTAW welding showed the formation of Laves phases and carbide without the presence of micropores. Corrosion resistance was superior for TWF-GTAW weld cladding, with slightly better performance observed for the double layer. In the PTA-P process, interdendritic corrosion was observed, which can be associated with the presence of micropores.
Keywords: Weld cladding; Top wire feeding GTAW process; Plasma transferred arc with powder; Corrosion performance
Referência:
HAUPT, W.; RIFFEL, K.C.; DALL’OGLIO, A.P.; SCHWEDERSKY, M.B.. Microstructure characterization and corrosion performance of Alloy 625 weld cladding deposited using TWF-GTAW and PTA-P. Int J Adv Manuf Technol (2024). https://doi.org/10.1007/s00170-024-14733-y