In laser droplet joining, a drop of the desired size (? 1mm) and temperature is generated on demand from a metal wire and deposited on a joining spot by a laser pulse. Droplet energy and volume are used to create a material-to-material joint. In this article, the laser droplet generation process, process parameters and a system for laser droplet generation and joining are described. Applicability of the technology is demonstrated with various examples: spot joining of thin metallized parts, spot joining of dissimilar materials and continuous droplet joining of zinc-coated steel sheets.
COBISS.SI-ID: 10984219
Prediction of spatio-temporal field evolution is based on the extraction of a physical law from joint experimental data. If the only source of information is a field record, a method of field generators based on nonparametric modeling by conditional average can successfully replace differential equations. In this article we apply the method of field generators to a two-dimensional chaotic field record that describes the asynchronous motion of high-amplitude striations. We show how to choose the model structure in order to optimize the quality of the prediction process.
COBISS.SI-ID: 10980891
Automatic condition monitoring application for the detection of spring faults during assembling of reciprocating compressors is presented in this paper. Spring faults are characterized by an increased force, therefore force signals are used to extract features, appropriate for an automatic condition monitoring. The main contribution of this paper is the development and testing of various decision strategies for the recognition of faulty compressors. Results show that adaptive decision strategy with adaptive deviation yields the best fault recognition rate.
COBISS.SI-ID: 11064347
The weldability of zinc coated steel sheets is often compromised by weld seam defects caused by rapid zinc vaporisation and burned-off zinc. In this paper, the laser droplet generation process and its application to laser droplet welding of zinc coated steel sheets are described. Results show that laser droplet welding offers a promising technology for spot and continuous welding of zinc coated steel sheets in different joint configurations with good mechanical properties and corrosion resistance.
COBISS.SI-ID: 10981147
Despite the vulcametry results are based on firm theoretical grounds, these relations often prove to be inaccurate in practice because they are influenced by various other factors, hardly manageable by the theory. That makes predictions less reliable and therefore demands additional laboratory testing. It is shown in this work how a sensible combination of both the theoretical models and neural networks can boost the performance in prediction of mechanical properties. Thus it can effectively be used to rationalize laboratory work in the field of rubber vulcametry and property predictions.
COBISS.SI-ID: 7138644