Improvement in formability of tailor welded blanks by application of counter pressure in biaxial stretch forming

Panda, Sushanta Kumar; Kumar, Deepak

doi:10.1016/j.jmatprotec.2007.10.076

Cited by 41 publications

(19 citation statements)

References 16 publications

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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%

“…No weld line movement was observed in the HSLA-HSLA and in the other, similar combinations found in the literature. [14] A comparison of the predicted and experimental weld line movement toward the DP980 side for the HSLA-DP980 combination is shown in Figure 11. The weld line movement increased with the distance from the draw bead; it had a maximum at the pole.…”

Section: Weld Line Movement and Strain Distributionmentioning

confidence: 99%

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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%

Section: Weld Line Movement and Strain Distributionmentioning

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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“…FE analysis of the TWBs is a challenging task because it involves consideration of the weld metal (WM) properties during the simulation. If the properties of weld zones are not considered, then the simulation results are found to be deviating from the experimental results [3,6,18]. On considering the weld metal properties, results of simulation and experimental works are found to be in better agreement with each other [19][20][21].…”

Section: Introductionmentioning

confidence: 86%

“…However, after joining, when the welded blanks are subjected to forming and as it involves joining of two materials having different properties, the deformation characteristics of two materials will be different and due to that there will be movement of weld line [3,4] The strong/thick material will be able to resist the load more easily in comparison with the weak/thin material and because of that there will be shifting of weld line from weak/ thin material to the strong/thick material [1]. This weld line movement indirectly leads to reduce the formability of the TWBs as well [1,5,6].…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation on forming behavior of friction stir tailor welded blanks (FSTWBs) during single-point incremental forming (SPIF) process

Marathe

Raval

2019

J Braz. Soc. Mech. Sci. Eng.

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Tailor welded blank (TWB) is a product which is developed by joining two or more than two materials having same/different thickness and/or properties before any forming process. The method to join the materials can be any of the conventional or advanced methods. TWB offers advantages like overall weight and cost reduction in a product. Despite of such advantages, the application of TWBs is partially resisted by the disadvantages associated with it like formability reduction and weld line movement during the forming operations. A lot of effort has been done in order to overcome the mentioned limitations of the TWBs. However, for homogeneous blank, single-point incremental forming (SPIF) results in better formability so in present work, the attempt has been made to study the forming behavior of TWB during the SPIF process. In this work, the effect of TWB material parameters like yield strength ratio, thickness ratio, strength coefficient ratio and strain index ratio of the parent materials has been investigated on the weld line movement and % thinning of the blank through finite element analysis. In order to perform the numerical analysis, ABAQUS/Explicit was used. Using SPIF, round cup geometry is formed from a flat TWB and effect of different initial positions of tool is investigated. It has been found that when the forming process is started from the weld and tool is travelled toward strong material of the blank, it leads to the minimum thinning, weld line shift and plastic equivalent strain (PEEQ).

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“…Dome tests were conducted and compared with simulation results allowing the validation of the approach for progressive forming. The forming parameters and processing dial-up for tailor welded blanks presents its own challenges (Panda & Kumar, 2001) as described in a study on the improvement of formability through application of counter pressure in biaxial stretch forming of tailor welded parts. Joining of dissimilar materials has been given much attention in recent years due to their superior functional capabilities.…”

Section: Introductionmentioning

confidence: 99%

Laser Welding Application in Crashworthiness Parts

Peixinho¹

2010

Laser Welding

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Improvement in formability of tailor welded blanks by application of counter pressure in biaxial stretch forming

Cited by 41 publications

References 16 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

Numerical investigation on forming behavior of friction stir tailor welded blanks (FSTWBs) during single-point incremental forming (SPIF) process

Laser Welding Application in Crashworthiness Parts

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