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The paper treats the results obtained in simultaneous measurements of acoustic emission with PZT AE sensors and of deformations with resistance measuring rosettes carried out during and immediately after laser cutting-out of a deep-drawn sheet product, i.e. mudguard. The presence of a field of residual stresses produced by deep-drawing is characteristic of(More)
This paper presents an improved monitoring system for the failure detection of engraving tool steel inserts during the injection molding cycle. This system uses acoustic emission PZT sensors mounted through acoustic waveguides on the engraving insert. We were thus able to clearly distinguish the defect through measured AE signals. Two engraving tool steel(More)
Acoustic emission provides information on the process of nugget formation in resistance spot welding and on the quality of the weld. The information obtained on the basis of acoustic emission can either confirm or reject the conclusions about weld quality. In the research, the acoustic emission signal was compared to the results of the measured electrical(More)
The paper treats the results obtained in simultaneous measurements of acoustic emission with PZT AE sensors and of strain with resistance measuring rosettes carried out during and immediately after laser cutting-out of a deep-drawn sheet product, i.e. mud-guard. The presence of a field of residual stresses produced by deep-drawing is characteristic of(More)
The detected AE signals during RSW process include important information about the physical changes in the material being welded as well as those in the electrodes. Besides, there are some other sources who are not related to the welding process and should be taken into account, if can not be avoided. The detected AE signals are the resultant of all these(More)
In this paper a new NDT system is presented. The system is composed by a planar eddy currents probe (IOnic probe), electronic devices for signal generation, conditioning and conversion, automated mechanized scanning and analysis software. This new IOnic probe allows a 3D induced current in the material, and an easy interpretation of the signal based, not on(More)