Characterization of PHS 22MnB5 steel spot welded in single operation and with additional pre and post heating steps
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2022
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CONGRESSO BRASILEIRO DE ENGENHARIA E CIÊNCIA DOS MATERIAIS, 24.
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Resumo
The hot pressing hardened steel known as “Press Hardened Steel – PHS”, is a steel of extreme
importance for the automotive industry. The application of this type of steel in the structure of
vehicles promotes the improvement of safety, mass reduction and lower fuel consumption. The
increase in the use of this type of steel, culminated in the need to deepen knowledge about the
joining processes, more specifically about the electrical resistance welding process known as
“Resistance Spot Weld – RSW”, which is one of the most used processes in automotive structural
construction. The objective of the present work is to evaluate the spot welding of PHS 22MnB5
steel hardened through heat treatment in the laboratory, simulating the hot pressing process
commonly applied in automotive industrial practice. A study is carried out on spot welding of
similar materials, that is, the welding of 22MnB5 steel with itself, an autogenous weld. Welding was
carried out under two different conditions, the first of which considers a single step of joining the
sheets and the second with the application of additional steps of pre and post heating. The
characterization of the welds was done through mechanical tests and microstructural analysis. The
mechanical strength was evaluated based on the effectively resistant area, considering the effective
dimensions of the spor welds obtained in the ultrasound measurement, already discounting the
area values of possible flaws/voids existing inside the spot welds that have been detected in the
ultrasound. The results showed that the welds performed in the single step condition generally
presented higher values of mechanical strength in relation to those in which additional pre and
post-heating steps were applied. These results suggest that the additional steps of pre and post
heating act to promote annealing or tempering of the weld material and adjacent regions,
increasing the region affected by heat, modifying the microstructure, reducing the hardness and
consequently the mechanical strength in these regions.
Como referenciar
JESUS, E.R.; ROSSI, J.L.; MUCSI, C.S.; LARA, J.C.; NOGUEIRA, E.J.; FURLANETTO, V. Characterization of PHS 22MnB5 steel spot welded in single operation and with additional pre and post heating steps. 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/123456789/33771. Acesso em: 30 Dec 2025.
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.