Compare the analytical and experimental weld line movement in deep drawing process by one and two piece blank holder

A tailor-welded blank (TWB) composed of two or more sheet metal with different ductility properties¡ that its main advantage is a weight loss product and production costs without compromising product safety. Tailored welded blanks are increasingly used in the automotive industry. Weld-line movement in tailored welded blanks is always considered as a challengeable problem¡ during production process. Compared to the base metal¡ the formability of tailor welded blank is less due to the presence of weld area and strength mismatch between component blanks. Weld-line movement is one of the parameters¡ having effect on sheets plasticity. The aim of this paper is compare the weld-line movement in different parts of the tailored welded blank between the blank holder blank one-piece and two-piece. For this purpose¡ in this article a three dimensional finite-element simulation has been carried out. In this regard¡ a deep drawing tool is manufactured for validation¡ and comparison has been performed between simulation and experimental results¡ being obtained from deep drawing of TWB''s¡ with having different thickness and different weld-line location. Argon welding is used for manufacturing tailor welded blanks before forming and tensile test. Finally¡ using surface response technique¡ simulation is done to investigate the effect of punch and die''s radius¡ weld-line situation and thickness rate¡ on weldline movement and thickness distribution in square TWBS.