Experimental and numerical assessment of Tailor-Welded Blanks formability

Gaied, Sadok; Roëlandt, Jean-Marc; Pinard, Fabrice; Schmit, F.; Balabane, Mikhaël

doi:10.1016/j.jmatprotec.2008.02.031

Cited by 47 publications

(11 citation statements)

References 25 publications

(12 reference statements)

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“…Very few studies have been reported on the formability of tailored blanks of dissimilar combinations in stretch forming. [14,15] No open research literature has been found on the formability of dissimilar tailored blank combinations of AHSSs (different DP steels) with HSLA during stretch forming.…”

Section: B Tailored-welded Blanks and Challengesmentioning

confidence: 99%

Formability Analysis of Diode-Laser-Welded Tailored Blanks of Advanced High-Strength Steel Sheets

Panda

Hernández

Kuntz

et al. 2009

Metall Mater Trans A

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Currently, advances due to tailored blanking can be enhanced by the development of new grades of advanced high-strength steels (HSSs), for the further weight reduction and structural improvement of automotive components. In the present work, diode laser welds of three different grades of advanced high-strength dual-phase (DP) steel sheets (with tensile strengths of 980, 800, and 450 MPa) to high-strength low-alloy (HSLA) material were fabricated by applying the proper welding parameters. Formability in terms of Hecker's limiting dome height (LDH), the strain distribution on the hemispherical dome surface, the weld line movement during deformation, and the load-bearing capacity during the stretch forming of these different laser-welded blanks were compared. Finite element (FE) analysis of the LDH tests of both the parent metals and laser-welded blanks was done using the commercially available software package LS-DYNA (Livermore Software Technology Corporation, Livermore, CA); the results compared well with the experimental data. It was also found that the LDH was not affected by the soft zone or weld zone properties; it decreased, however, with an increase in a nondimensional parameter, the ''strength ratio'' (SR). The weld line movement during stretch forming is an indication of nonuniform deformation resulting in a decrease in the LDH. In all the dissimilar weldments, fracture took place on the HSLA side, but the fracture location shifted to near the weld line (at the pole) in tailor-welded blanks (TWBs) of a higher strength ratio.

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Section: B Tailored-welded Blanks and Challengesmentioning

confidence: 99%

Formability Analysis of Diode-Laser-Welded Tailored Blanks of Advanced High-Strength Steel Sheets

Panda

Hernández

Kuntz

et al. 2009

Metall Mater Trans A

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“…Via de regra, para se reduzir a massa, acaba-se perdendo em desempenho estrutural. Uma alternativa para que se minimize o ganho de peso é, apenas em regiões de maiores solicitações mecânicas, utilizar reforços ou batentes [5,6].…”

Section: Introductionunclassified

Caracterização Mecânica e Análise Microestrutural de Chapas Obtidas pelo Processo de Tailor Welded Blank (TWB)

Andrade

2019

Soldag. insp.

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Resumo Um dos maiores desafios da indústria automobilística, a nível global, trata-se de desenvolver veículos que sejam, simultaneamente, leves e resistentes mecanicamente. O Tailor Welded Blank (TWB) surge como solução, pois é um processo que permite a soldagem de topo de chapas de diferentes especificações (material, espessura e/ou revestimento), antes da conformação. Nesta pesquisa trabalhou-se com chapas de aços livre de intersticiais (IF –Intertitial Free), da Companhia Siderúrgica Nacional (CSN), de códigos FEE 210 de 1,2 mm de espessura e IF CSN FEP 05 de 0,7 mm de espessura, soldadas a laser. Foram feitos ensaios de tração uniaxial e de microdureza Vickers. A linha de solda foi orientada de 0° a 70° (variando de 5° em 5°). A partir dos resultados obtidos espera-se que se possa consolidar uma metodologia para avaliação do melhor ângulo possível para a linha de solda de um TWB. Constatou-se que a carga máxima suportada aumenta à medida que se inclina a linha de solda (até um determinado limite) e que ângulos complementares de inclinação geram cargas cisalhantes similares. Deve-se trabalhar então com ângulos que permitam otimização de resistência mecânica, melhor conformabilidade e maior redução de massa e de custos. A seleção desse ângulo ficará atrelada a questões de projeto e não mais a tentativas e erros.

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“…3 TWBs provide the chance for the auto industry to decrease cost, reduce vehicle weight, and increase the total quality of sheet metal-stamping technology. 4 It has been acknowledged that the forming limit diagram (FLD) is the best technique to study the formability during the sheet metal forming process. A curve of the mixing of minor and major principal strains at the fracture for various stress states is known as FLD.…”

Section: Introductionmentioning

confidence: 99%

Comparison of different welding methods on mechanical properties and formability behaviors of tailor welded blanks (TWB) made from AA6061 alloys

Bagheri

Abbasi

Hamzeloo

2020

Proceedings of the Institution of Mechanical Engineers, Part C:

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A tailor welded blank (TWB) includes two or more blanks joined together in order to make a single blank. Different welding methods are used to join blanks with different characteristics and form TWBs. In this study, a comparison is made among the effects of three different welding methods namely CO2 laser welding, friction stir welding (FSW), and friction stir vibration welding (FSVW) on mechanical and formability properties of developed TWBs. AA6061 alloy sheets with different thicknesses (1.2 and 0.8 mm) are joined to get TWBs. The forming limit diagram (FLD) and limiting dome height (LDH) are applied to assess the formability. The Taguchi method is applied to find the optimum values of welding parameters. It is concluded that TWBs made by FSVW have higher mechanical properties and formability compared to TWBs made by FSW and CO2 laser welding. The results also indicate that FLD for TWBs made by FSW is higher than FLD for TWBs made by CO2 laser welding and FLD0, for TWBs made by FSVW, increases as vibration frequency increases.

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Experimental and numerical assessment of Tailor-Welded Blanks formability

Cited by 47 publications

References 25 publications

Formability Analysis of Diode-Laser-Welded Tailored Blanks of Advanced High-Strength Steel Sheets

Formability Analysis of Diode-Laser-Welded Tailored Blanks of Advanced High-Strength Steel Sheets

Caracterização Mecânica e Análise Microestrutural de Chapas Obtidas pelo Processo de Tailor Welded Blank (TWB)

Comparison of different welding methods on mechanical properties and formability behaviors of tailor welded blanks (TWB) made from AA6061 alloys

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