Study of patchweld blank Resistance Spot Welding (RSW) before hot stamping with and without heat treatment parameters
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2018
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CONGRESSO BRASILEIRO DE ENGENHARIA E CIÊNCIA DOS MATERIAIS, 23.
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Resumo
The global legislators have passed more severe vehicle emissions and safety
regulations through 2020. In order to solve this equation, the advanced high strength
steels (AHSS) grades are qualified to meet the functional performance demands of
certain parts. For structural elements, AHSS steels are excellent in the crash zones of
the vehicle for their high energy absorption. For structural elements of the passenger
compartment, extremely high-strength steels the boron-based Press Hardened Steels
(PHS) become one of the most popular materials to improved safety performance. The
AHSS permit design body structures with a thinner material in specific areas to achieve
the project requirements, due to the high strength and combined with inner
reinforcement, too. Recently, the engineers decided to produce parts and
reinforcement at the same time during forming called “patchweld” and the PHS steel
was specified for the purpose. However, the blanks have to keep together during the
hot stamping process and Resistance spot welding (RSW) as a most common welding
process for joining sheet steels in the car-body production was the obvious chose. The
designed microstructure of the AHSS can be destroyed with the welding thermal cycle,
which can affect failure behavior and mechanical properties of the welded structure. It
has been recognized that the RSW parameters selection played an important role in
the AHSS welding performance. This paper aims to understand the tempering process
performed during the RSW cycle with two different welding parameters, known as P4
and P5. The P4 and P5 welding parameters were defined to reach the maximum load
during the shear test while full bottom detachment according to AWS D8.9.The test
samples were assembled with a gap to reproduce real vehicle welding conditions. The
parameter P4 weld PHS sheet samples without heat treatment and without the use of
tempering during the passage of current, whereas the parameter P5, weld equal
samples, but with tempering during the resistance welding process. The influence of
these parameters on the PHS “patchweld” mechanical properties was evaluated with
Vickers hardness test (HV) through the cross-section of the specimen with standard
metallographic technique preparation and shear tests. The results confirmed the
difference at the Heat affected zone (HAZ) mechanical strength over fusion zone (ZF).
For the two welding parameters, it was possible to visualize a softening region in the
HAZ of the welding parameter P4. The welding parameter P5 with a tempering pattern
at the weld obtained superior results in the Heat affected zone due to the reduction of
the cooling speed caused by a process performed during the RSW cycle.
Como referenciar
MARCELO, L.A.; LARA, J.A.C.; ROSSI, J.L.; COLOSIO, M.A.; OLIVEIRA, B.G.; MUCSI, C.S. Study of patchweld blank Resistance Spot Welding (RSW) before hot stamping with and without heat treatment parameters. In: CONGRESSO BRASILEIRO DE ENGENHARIA E CIÊNCIA DOS MATERIAIS, 23., 04-08 de novembro, 2018, Foz do Iguaçu, PR. Resumo... p. 4805-4805. Disponível em: http://repositorio.ipen.br/handle/123456789/29555. 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.