Maximum Bulge Height and Weld Line Displacement in Hydroforming of Tailor Welded Blanks

Kumar, Amit; Gautam, Vijay; Kumar, Deepak

doi:10.1115/1.4038513

Cited by 8 publications

(3 citation statements)

References 27 publications

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“…Panda et al 10 carried out hydro-mechanical stretch forming tests on TWBs of interstitial free (IF) steel and reported that the alliance of counter pressure and lubrication helped in enhancing the height of the stretch formed samples by 40% in comparison with the conventional stamping process. Kumar et al 11 performed hydroforming experiments on laserwelded IF steel and showed that the maximum safe bulge height reduced with an increase in the thickness ratio. A successful effort was also made to improve the uniformity in the bulge profile by relocating the weld line towards the thinner side of the TWB.…”

Section: Introductionmentioning

confidence: 99%

Formability prediction of tailor-welded blanks in hydraulic bulging using flow curves from biaxial tensile tests

Kumar

Digavalli

2020

Proceedings of the Institution of Mechanical Engineers, Part L:

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In this work, the formability of laser-welded tailored blanks of low carbon steel of two different thickness combinations in hydraulic bulging has been studied by numerical simulation. For material modeling, flow curves of the parent sheets were obtained in biaxial stress condition by conducting hydraulic bulge tests. These curves were used to extrapolate the uniaxial tensile curves up to large strains using the work equivalence principle. The limiting dome height in conventional forming and hydraulic bulging of tailor-welded blanks has been predicted in finite element simulations using the flow curves obtained directly from the hydraulic bulge tests and the extrapolated uniaxial tensile curves. Hydraulic bulging and conventional forming experiments on tailor-welded blanks have also been conducted to validate the predicted results. It has been found out that the predicted limiting dome height of the tailor-welded blanks in conventional forming and hydraulic bulging using extrapolated uniaxial tensile curves is closer to the experimental values when compared to the results obtained by using stress–strain curves obtained from hydraulic bulge tests. It has also been found that using an extrapolated uniaxial tensile curve it is also possible to predict strain distribution and percentage thinning more accurately. It has been observed that with an increase in thickness ratio, the peak pressure increased but the predicted values of peak pressure using flow curves obtained directly from hydraulic bulge tests are closer to the experimental values.

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Section: Introductionmentioning

confidence: 99%

Formability prediction of tailor-welded blanks in hydraulic bulging using flow curves from biaxial tensile tests

Kumar

Digavalli

2020

Proceedings of the Institution of Mechanical Engineers, Part L:

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“…Mennecart et al [12] chose to position the weld line away from the centre line and concluded that, during forming, the weld bead resisted failure. Kumar et al [13] relocated the weld line towards the thinner/weaker side of the TWB blanks and achieved improvement in dome height by conducting hydraulic bulge test. They also worked on the effect of thickness ratio on weld line movement and maximum dome height using numerical simulations.…”

Section: Introductionmentioning

confidence: 99%

Optimum parameters to minimize weld line movement in the warm forming of tailor-welded blanks

Suresh

Regalla

Gupta

2018

J Braz. Soc. Mech. Sci. Eng.

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This paper deals with optimizing geometric parameters such as thickness ratio and weld line location, to minimize the movement of weld line during the stamping of tailor-welded blank (TWB) components. Weld line movement (WLM) is an important aspect to consider; otherwise, it leads to wrinkling and other forming-related problems. The major contributors to WLM are thickness ratio, weld line location, and strengths of the respective blanks. Selective heating is a recent technique adopted to reduce the material properties of the higher strength TWB blank by heating it locally, thus allowing a shift in the weld line. In this work, laboratory and simulation experiments were conducted under warm forming conditions on the TWB blanks. Experiments were also conducted by placing the weld line at an offset distance of ± 1 mm from the centre of blank. The situation is to choose the best possible value among thickness ratio and weld line location under the influence of selective heating to minimize the WLM. The objective function of WLM is obtained from the MINITAB statistical software by conducting ANOVA method. The optimum values of the parameters were obtained by minimizing the objective function.

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“…The tailor welded blanks achieves these functions by applying engineering material requirements at exact locations instead of distributing it along the entire body panel (Kumar et al, 2017;Xinge et al, 2019;Swagat et al, 2018). Sangwook et al (2018) discussed the advantage of improving the process efficiency while reducing the number of stamped parts.…”

mentioning

confidence: 99%

Forming of Tailor-Welded Blanks Through Centerline and Offset Laser Welding

Mayavan¹,

Karthikeyan²,

Balamugundan³

et al. 2022

International Journal of Manufacturing, Materials, and Mechanical Engineering

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The forming of low and high strength tailor welded steel sheets into preferred three-dimensional shapes by a homogeneous distribution of plastic strain is highly difficult. In this work, the formability of tailor-welded blanks prepared using laser welding of low (IS 513 CR2, IS 513 CR3) and high tensile strength (AISI 304) steel sheets were analyzed and the formation of the edge profile and weld line movement was also examined. The results showed a decrease in formability characteristics owing to the increase in Strength Ratio. Scanning Electron Microscope analysis of the fracture locations within unsuccessfully formed tailor welded blanks showed the presence of tempered martensite in the soft zone was found to be the most predominant factor affecting its failure. The formability characteristics of investigated tailored blanks were predicted using finite element simulation and compared with experimented results for validation.

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Maximum Bulge Height and Weld Line Displacement in Hydroforming of Tailor Welded Blanks

Cited by 8 publications

References 27 publications

Formability prediction of tailor-welded blanks in hydraulic bulging using flow curves from biaxial tensile tests

Formability prediction of tailor-welded blanks in hydraulic bulging using flow curves from biaxial tensile tests

Optimum parameters to minimize weld line movement in the warm forming of tailor-welded blanks

Forming of Tailor-Welded Blanks Through Centerline and Offset Laser Welding

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