Definiranje problema Developments in the field of the material cutting technologies are stimulated by engineering requirements for production, and include: improvements in productivity, high operational reliability, universality, enhancing of quality parameters, and last but not least, environmental criteria. In addition to the conventional material cutting technologies, the advanced cutting te...

We present a generalization of the Steiner problem in a directed graph. Given nonnegative weights on the arcs, the problem is to find a minimum weight subset F of the arc set such that the subgraph induced by F contains a given number of arc-disjoint directed paths from a certain root node to each given terminal node. Some applications of the problem are discussed and properties of associated p...

In order to study the effects of laser induced metal vapour on arc plasma during laser arc double sided welding (LADSW), emission spectroscopy techniques were utilised. The arc plasma in LADSW of 5A06 aluminium alloy was compared with conventional gas tungsten arc welding (GTAW) in this work. The electron temperature and density were estimated by the Saha– Boltzmann equation and the Stark broad...

With the increasing complexity of workpiece surfaces in aerospace and automotive molding other areas, an number cutting tools with different shapes performance have become necessary. A new kind tool is developed a double-arc revolving surface at tool’s end to improve processing quality numerical control milling, referred as (DACT) this paper. The parametric geometric model DACT established. Thr...

This paper is a review on the status of hard coating of various physical vapour deposition (PVD) techniques and compare their properties. The use of hard and wear resistant PVD coatings on cutting tools is now widespread in global manufacturing for reducing production cost and improving productivity, all of which are essential if industry is to remain economically competitive. The review includ...

Abstract The analysis of the influence various design solutions gas-dynamic stabilization system in plasma torches for cutting metals on efficiency equalizing velocities gas flows along cross-section path is carried out. It noted that evaluation method developed by authors should be based calculation uniformity flow velocity distribution over gas-air torch. A vortex using two swirlers proposed....

background: reduced time and appropriate bond strength of brackets is one of the most important aspects of orthodontic treatments. prolonged halogen light curing for bonding of brackets is undesirable, so the purpose of this study was to compare the shear bond strength of brackets bonded with halogen light and plasma arc system. materials and mehods: this was an experimental in vitro study. a t...