Setembro 2017 vol. 4 num. 1 - VIII Encontro Científico de Física Aplicada

Artigo Completo - Open Access.

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Effect of the cooling rates on heat-affected zone of UNS S32304 duplex stainless steel welded by pulsed GTAW process

Betini, E. G. ; Gomes, M. P. ; Reis, L. A. ; Mucsi, C. S. ; Alencar, M. C. ; Orlando, M. T. D. ; Luz, T. S. ; Avettand-Fènoël, M-N. ; Rossi, J. L. ;

Artigo Completo:

Duas placas de aço inoxidável duplex UNS S32304 foram soldadas através do processo GTAW pulsado utilizando 98% de argônio mais 2% de nitrogênio como gás de proteção e argônio puro como gás de purga sem metal de adição. Os perfis de temperaturas próximos e ao longo da poça de fusão foram medidos usando termopares tipo K (Ni-Cr), conectados em um sistema de aquisição de dados. Os perfis térmicos foram alcançados na zona afetadas pelo calor em regiões entre 1 e 3 mm de distância do cordão de solda. Além disso, as taxas de resfriamento e o tempo de permanência foram observados com respeito ao gás de purga utilizado. As medidas experimentais de ciclo térmico estão de acordo com os valores da literatura. As soldas realizadas sem qualquer tipo de gás de proteção revelaram maiores picos de temperatura e maiores taxas de resfriamento. O estudo da distribuição de temperatura resultou em picos de temperatura no intervalo da transformação de fases para as placas soldadas de aço inoxidável duplex.

Artigo Completo:

Two thin plates of UNS 32304 of duplex stainless steel were joined by pulsed gas tungsten arc welding (GTAW) using a mixture 98% of argon plus 2% of nitrogen as shielding gas or pure argon as purging gas at the bottom of the plate without filler metal. The temperature profile close and away from the weld pool was measured using K type (Ni-Cr) thermocouples, connected to a digital data acquisition system. The thermal cycles was recorded in the heat-affected zone (HAZ) at a distance in between 1 and 3 mm from the joint line. The cooling rate and holding time were studied with respect to the used purging gas. Experimental thermal profiles are in good agreement with literature values. The joints welded without any purging gas revealed high peak temperature and cooling rates. The present investigation showed that temperature peaks are comprised in the phase transformation temperature ranges for the welded duplex stainless steel.

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Palavras-chave: soldagem GTAW, aço inoxidável duplex, taxa de resfriamento, perfil térmico,

Palavras-chave: GTAW, duplex stainless steel, cooling rate, thermal profiles,

DOI: 10.5151/phypro-viii-efa-04

Referências bibliográficas
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Como citar:

Betini, E. G.; Gomes, M. P.; Reis, L. A.; Mucsi, C. S.; Alencar, M. C.; Orlando, M. T. D.; Luz, T. S.; Avettand-Fènoël, M-N.; Rossi, J. L.; "Effect of the cooling rates on heat-affected zone of UNS S32304 duplex stainless steel welded by pulsed GTAW process", p. 14-18 . In: . São Paulo: Blucher, 2017.
ISSN 2358-2359, DOI 10.5151/phypro-viii-efa-04

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