2015

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https://eir.nuos.edu.ua/handle/123456789/3334

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Перегляд 2015 за Ключові слова "electrode vibrations"

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    Influence of high-frequency electrode vibrations on the geometry of penetration at automatic submerged arc cladding = Влияние высокочастотных колебаний электрода на геометрию проплавления при автоматической наплавке под флюсом
    (2015-11-09) Dragan, S. V.; Драган, С. В.; Yaros, Yu. A.; Ярос, Ю. А.; Simutenkov, I. V.; Trembich, V. Ya.; Трембич, В. Я.
    High-frequency oscillations electrodes for automatic submerged arc cladding, along with providing managed metal transfer and improved productivity melting electrode — an effective management tool geometry penetration. The purpose of this work-design and experimental evaluation of the influence of the geometry of penetration of the high-frequency oscillations electrodes in submerged arc cladding. Based on the analysis of the speed of the arc for high-frequency oscillations electrodes found that with increasing amplitude of the oscillation frequency increases and the average speed of the electrode tip and arc cladding. When vibrations of the electrode tip with a frequency of 1 Hz and amplitude of 10 mm can be regarded as an arc of a fast-heating source. The speed of movement of such a source is ten times greater than the rate of propagation of heat in the base metal. Therefore, electrode oscillation with amplitude greater than the width of the weld bead results in loss of depth and area of penetration during cladding with high-frequency oscillations electrodes. This pattern is confirmed by calculations using the model of the moving heat source of finite width. Based on the ratio between the speed of movement of the heat source and heat propagation in base metal, established three areas of influence of the frequency and amplitude of the high-frequency oscillations electrodes on the technological characteristics of the arc process and the geometry of the metal penetration zone: 1) the influence of the geometry of the penetration zone and there is no transfer of metal; 2) melting of the electrode performance, the nature and geometry of the managed transfer penetration zone defined by the relation between frequency and amplitude of vibration; 3) the quality of the formation of the deposited layer decreases sharply due to violation of the stability of the arc at high speed of its movement. Based on the records of thermal cycles points in the heating zone confirmed the influence of the geometry of the high-frequency oscillations electrodes penetration and the propagation of heat in the base metal. Found that variations in cladding a temperature of 250 Hz test points, located transversely at a distance of 6 mm from the roll axis at 60 °C (15 %) than the value obtained by cladding without vibration. This is because increasing the amplitude of the oscillations increases the heat flow dispersion zone decreases weld metal bath superheat increases the thermal efficiency of the fusion process and, as a consequence, increases the penetration area. This pattern persists as long as the heat surrounding layers of solid based metal will not exceed the influx of heat from the heating source. Further growth of the oscillation amplitude will increase the width of the weld pool and reduce the depth and area of penetration. The dependence is confirmed by the results of the calculation. Established laws allow by calculation to determine the size and shape of the penetration zone for automatic submerged arc cladding with the high-frequency oscillations electrodes, as well as serve as a basis for selecting parameters oscillation mode to control the geometry of the deposited layer. = Приведены результаты исследования влияния скорости перемещения источника нагрева — сварочной дуги при автоматической наплавке под флюсом с высокочастотными колебаниями электрода на температурное поле в основном металле и геометрию зоны проплавления. Расчетным путем определены области, соответствующие различному эффекту от воздействия параметров поперечных высокочастотных колебаний электрода на устойчивость дуги, характер переноса металла и геометрию зоны проплавления.