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| Piela A. |
| THE ANALYSIS OF THE FLOW OF LASER WELDED TAILORED BLANKS BULGED BY LIQUID OR A PUNCH |
Abstract
The article presents examination results of the process of bulging of laser welded tailored blanks with the use of rigid punch or liquid. Local strain distribution in bulged coatings have been determined applying the method of measuring the co-ordination nets. The determined local strain allowed to define the differences in the flow of welded tailored blanks according to the mechanical properties of the blanks, their thickness and the position of the laser weld. The obtained results were the proof of the fact that the laser weld, despite its width, significantly changes mechanical properties of the zone of joining of the blanks. The shape of cups obtained in the process of bulging where liquid bas been used is significantly different for the joining of blanks of the same thickness and the same grade compared to the joining of the blanks of different thickness and different grade. Cracking of laser welded tailored blanks which have been made of blanks of different thickness or different grade appears on the side where the thinner blank is (i.e. where the strength of the blank is lower) near the heat effect zone. Plastic properties near the heat effect zone have been slightly deteriorated as a result of changes in the structure of the material as compared to properties of the blanks before the process of welding. The presented examination results made it possible to elaborate some guidelines for processing laser welded tailored blanks applying the method of hydroforming.
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| Keywords: hydroforming|bulge test|tailored blanks|drawability|stress and stain analysis| |
| No 4 (2004), p. 299-304 |
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