Određivanje karakteristika obradivosti „tailored” limova

Abstract

Presented in the paper are the results of experimental investigations of tailor welded blanks formability. Blanks were made by laser welding of two sheets with different thickness (0.8 mm and 1.5 mm), the same material (high strength steel with BH effect) and the same surface condition (galvanic zinc coating). Investigation by uniaxial tension were applied on series of specimens with transverse weld line. Folowing formability properties are determined: basic mechanical properties, strengthening curves, r-value and n-value. Forming analysis of each sheet separately and assembly was performed. Conclusions are pointing out specific influence of inhomogenity caused by different thickness and welding zone and leading to further investigations with longitudinal and angled positions of welded line related to force action direction.