Study of the corrosion resistance of duplex and lean duplex steels welded by the gas tungsten arc welding double fusion (GTAW-DF) applied in the construction of tanks
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2022
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BRAZIL MRS MEETING, 20th
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Resumo
Duplex stainless steels has great technological importance due to the combination of high
mechanical strength, high toughness and excellent corrosion resistance. New methods of
joining these materials have been investigated and updated, with better cost-benefit. In this
work, joints welded by the TIG process with root pass by the double-fusion method (GTAW-DF),
typically applied in the construction of tanks for the citrus juice and biotechnology
industry were investigated. The welding process of steels changes in its microstructures
forming of deleterious precipitates which decrease the corrosion resistance. Thus, the aim
of this work was to evaluate and compare the corrosion resistance after welding by the
GTAW-DF process of similar joints of lean duplex 2101 steel and dissimilar joints of 2205
and 2304 steels, duplex and lean duplex respectively, both used in the citrus juice industry.
Samples were made using optimized welding parameters under corrosion resistance
criteria. Microstructural characterization was performed by metallographic etching and
observation by optical microscopy (OM) and by scanning electron microscopy (SEM).
Mechanical properties were evaluated by microhardness test. Corrosion resistance was
evaluated by electrochemical tests by the double loop electrochemical potentiokinetic
reactivation test (DL-EPR) and potentiodynamic polarization test. The results showed that
the welding process caused microstructural changes in the materials, and that after welding
the most susceptible regions to corrosion were in the fusion line and in the thermally
affected zone. When analyzing the two welding conditions, it was observed that the welded
samples with higher heat input showed lower tendencies to intergranular corrosion.
Como referenciar
BUGARIN, ALINE de F.S.; VIVEIROS, BARBARA V.G. de; TERADA, MAYSA; SILVA, LEANDRO S. da; GUILHERME, LUIS H.; NEVES, MAURICIO D.M. das; COSTA, ISOLDA. Study of the corrosion resistance of duplex and lean duplex steels welded by the gas tungsten arc welding double fusion (GTAW-DF) applied in the construction of tanks. In: BRAZIL MRS MEETING, 20th, September 25-29, 2022, Foz do Iguaçu, PR. Abstract... São Carlos, SP: Aptor Software, 2022. Disponível em: http://repositorio.ipen.br/handle/123456789/33555. Acesso em: 20 Mar 2026.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.