Effect of shielding gas on thermal properties of thin plates of duplex stainless steel welded by pulsed GTAW process
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2022
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CONGRESSO BRASILEIRO DE ENGENHARIA E CIÊNCIA DOS MATERIAIS, 24.
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In this work, UNS32304 duplex stainless steel welds were evaluated by observing the influence of
the pulsed GTAW welding process on thermal properties of this material. 1.8 mm duplex stainless
steel sheets were welded by the GTAW process varying the shielding gases between pure Ar and Ar
+ 2%N2 without filler metal. The thermal welding cycles were studied by a type K and S
thermocouple system fixed close to the welding line. The temperature distribution along the
welding line was determined by reaching values within the phase transformation range of this
material. Through a quantitative and semiquantitative evaluation of elements the Creq/Nieq ratio
was calculated for the ferrite, austenite and secondary austenite grains of the solidified zone, ZAC
and base metal. The addition of 2% N2 in the shielding gas caused an increase of the austenite
formation in the solidified zone if compared to welding without N2 addition, being the most
suitable atmosphere for welding in duplex stainless steels. The thermophysical properties were
studied by laser flash method (MFL) used to determine the thermal diffusivity of the material in the
thickness direction. The specific heat and Curie temperature of the solidified zone of welds was
obtained by the thermal analysis by differential exploratory calorimetry (DSC). Measurements of
porosities and specific mass of the solidified zone were obtained and compared with the base
metal and metal as received. With this information it was possible to evaluate the thermal
conductivity of the material after welding process. Increased thermal conductivity was found for
both welded samples and suggest correlation with increased ferritic phase and decreased porosity
also observed for solidified zone.
Como referenciar
BETINI, E.G.; TERUI, C.; REIS, L.A.; MUCSI, C.S.; LUZ, T.d.; ORLANDO, M.T.; ROSSI, J.L. Effect of shielding gas on thermal properties of thin plates of duplex stainless steel welded by pulsed GTAW process. In: CONGRESSO BRASILEIRO DE ENGENHARIA E CIÊNCIA DOS MATERIAIS, 24., 6-10 de novembro, 2022, Águas de Lindóia, SP. Resumo... Disponível em: http://repositorio.ipen.br/handle/123456789/33772. 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.