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When applying tailor-welded blanks (TWB) composed of parts with different properties for deep drawing and other forming processes, problems with non-uniform material flow occur. Welding of various parts of TWB into usable units, their different stress-strain properties, respectively different thicknesses influence their formability and the weld movement. This results in inaccuracy of the drawn parts [Mainders 2000, Fracz 2013]. Various tool designs for deep drawing, stretching or bending process can influence the material flow and avoid errors on the drawn parts. One of the solutions is to use a blankholder able to adapt to different properties of the blank and enabling the non-uniform distribution of the blankholder pressure around the perimeter of the drawing edge [Evin 2012, Bílik 2010, Slota 2014].

WELD MOVEMENT IN DEEP DRAWING OF TAILOR-WELDED BLANKS