In this paper the possibilities of applying sensors based on filters with surface acoustic waves (SAW) for the detection of harmful products in welding processes are analyzed. This review discusses the sensing mechanism and configurations of the sensors. The principles of SAW sensors are considered with special emphasis on the application of conducting polyaniline nanocomposites as sensitive thin layers in sensors for the detection of CO, NO2, and COCl2. The literature suggests the use of In2O3 as a dopant for CO and NO2 detection sensors, and ethylenediamine and phenylenediamine in COCl2 sensors. The paper presents original results of modeling of sensors that are designed for detection of CO and NO2 for which there are experimental data in the literature. The results obtained based on this model are in excellent agreement with results from the literature, which shows the validity of modeling. Based on the developed modeling methods, calculations were done for sensors for the detection of these gases in which the structure was the surface of quartz. From these modeling results it can be concluded that the use of the quartz substrate provides better sensitivity. In addition, the quartz sensors are thermally stable
Inovativna tehnologija laserskog čišćenja različitih površina u industriji, uključuje integrisani pristup kontrole procesa interakcije laser-materijal i ispitivanja rezultata laserskog delovanja. Lasersko čišćenje ima značajne prednosti u odnosu na klasične metode čišćenja: ima veliku selektivnost, preciznost, efikasnost i pouzdanost u primeni kod različitih vrsta materijala. Termalna priroda procesa laserskog čišćenja unosi određeni rizik po predmete čišćenja, te su istraživanja optimizacije procesa u fokusu interesovanja velikog broja naučnika. U radu su prikazani rezultati laserskog čišćenja boje na bakarnoj površini i zaštitnog sloja na štampanoj pločici. Kontrola procesa laserskog čišćenja u realnom vremenu je vršena pomoću infracrvene kamere. Mikromorfološke promene čišćene površine su ispitivani optičkom mikroskopijom.
The influence of the microstructure of the X5CrNi18-10 stainless steel welded
joint on its resistance to general, pitting, and intergranular corrosion was
analysed. The structure of weld metal, heat affected zone (HAZ) and base
metal before and after electrochemical testing was analysed using SEM/EDS.
The influence of the roughness level of the welded joint on its resistance
to the mentioned types of corrosion was examined as well. Although the
degree of sensitization of HAZ was significantly lower than the limit value,
HAZ showed a noticeably greater tendency to general and pitting corrosion
than weld metal and base metal. Polishing has been shown to significantly
improve the corrosion resistance of HAZ than in the case of other parts of
the welded joint.
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