Investigation Concerning Maximal Forming Depth of Tailor Welded Blanks Made from same Material but Different Thickness Ratios

Abstract:

The formability of tailor welded blanks is significantly reduced compared with the homogeneous blanks. Some of the important factors that are behind this fact are: material property changes in the weld and the heat-affected zones, non-uniform deformation because of the differences in thickness, properties and/or surface characteristics and location and orientation of the weld with respect to the direction of application of load. The objective of this resarch work is to establish a relation between thickness ratio and maximal forming depth in TWBs made from same material but having different thickness. For the numerical simulation it was considered a rectangular workpiece with dimensions: 147,8mm x 147,8mm. Depending on the thickness value of the blank, the design of the working tools must be modified the dimensions of the punch using the same die for all simulations. During the simulation the FLD predict de forming behaviour of the metal sheet. For this study there was not a statistically significant relationship between maximal forming depth and thickness ratio of the tailor welded blanks. But it was possible to generate fitted models, that are parabolic relations, starting with the maximal forming depth for ratio 1 (homogeneous sheet), when the ratio increases, firstly the maximal forming depth decreases until one point where the tendency changes and lately increases, and the maximal forming depth achieves values even higher than the initials. Also it can be said that the thicker is the thin sheet the closer is the parabolic fitted form.

• Periodical: Applied Mechanics and Materials (Volume 371)
• Pages: 275-279
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.371.275
• Online since: August 2013
• Authors: Aurelian Albut
• Keywords: Formability, Maximal Forming Depth, Tailor Welded Blanks, Welding Line Movement

References

[1] H. Kim, Y. Heo, N. Kim, H.Y. Kim, D. Seo: Forming and drawing characteristics of tailor welded sheets in a circular drawbead, Journal of Materials Processing Technology, (2000), pp.294-301.

DOI: 10.1016/s0924-0136(00)00647-6

[2] A. Albut: The influence of the part geometry on the welding line displacement in case of tailor welded blanks. The Annals Of Dunărea De Jos, University Of Galaţi, Fascicle V, ISSN 1221- 4566, (2009), pp.135-138.

DOI: 10.35219/annugalshipbuilding.2019.42.16

[3] R. Davies, G. Grant, M. Smith, E. Oliver: Formability and fatigue of aluminum tailor-welded blanks. SAE Paper No. 2000-01-2664. Warrendale, PA: Society of Automotive Engineers, (2000).

DOI: 10.4271/2000-01-2664

[4] F.I. Saunders, R.H. Wagoner: Forming of tailor-welded blanks. Metallurgical and Materials Trans. A, (1996), pp.2605-2616.

DOI: 10.1007/bf02652354

[5] K. Abdzkkah, P.M. Wild, J.J. Jeswiet, A. Ghasempoor: Tensile testing for weld deformation properties in similar gage tailor welded blanks using the rule of mixture, Journal of Material Processing Technology, (2001), pp.91-97.

DOI: 10.1016/s0924-0136(01)00555-6

[6] K. Azuma, K. Ikemoto, K. Arima, H. Suriura, T. Takasago: Press formability of laser welded blanks, International Deep Drawing Research Group, (1990), pp.305-311.

[7] D. Ha, Y. Kim: Analysis of press formability for laser-welded blank, Korean Soc. Auto. Eng., (1996), pp.438-443.

[8] LS-DYNA Keywords Users Manual, Volume I, Version 971, Livermore Software Technology Corporation (1997), p.165.