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    Wyświetlanie 1-6 z 6
    Tytuł:
    Temperature Field in Surfaced Steel Casts with the Heat of the Weld Taken into Account
    Autorzy:
    Winczek, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/383043.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    surface treatment
    temperature field
    welding
    surfacing
    obróbka powierzchniowa
    pole temperatury
    spawalnictwo
    napawanie
    Opis:
    In this work a model of temperature field in a steel cast during surfacing was presented. Analytical solution for half-infinite body model was obtained by aggregating temperature increments caused by applying liquid metal and heat radiation of moving electrode. The assumptions were Gaussian distribution heat sources of applied metal and weld and of electric arc heat source. Computations of temperature field were carried out during surfacing of cuboidal steel cast. The results were presented as temporary and maximum temperature distribution in element’s cross section and thermal cycles at selected points. The accuracy of solution was verified comparing calculated fusion line to that obtained experimentally.
    Źródło:
    Archives of Foundry Engineering; 2014, 14, 1 spec.; 121-126
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Properties of High Chromium Hardfacings Made with Using Pulsed Arc
    Autorzy:
    Gucwa, M.
    Winczek, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/381430.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    hardfacing
    heat input
    self-shielded cored wire
    dilution
    napawanie
    dopływ ciepła
    rdzeń
    Opis:
    The paper discusses the possibility of using pulsed arc hardfacing for depositing high chromium and carbon surfaces. In these studies self-shielded cored wire was used as a material for hardfacing. Pulsed arc is used in welding technologies to better control of transport molten metal in the welding arc and heat input. The correct heat input results in limited dilution surfaces that is very important in wear prevention technologies. The paper presents the results of research on the geometric parameters and hardness of deposited surfaces. The investigation was carried out with various welding parameters that were designed in heat source. The survey was conducted on the specimens that were subjected to metallographic examination hardness test.
    Źródło:
    Archives of Foundry Engineering; 2015, 15, 1 spec.; 37-40
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The analysis of stress states in steel rods surfaced by welding
    Analiza stanów naprężenia napawanych prętów stalowych
    Autorzy:
    Winczek, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/354539.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    phase transformation
    residual welding stresses
    stress measurement
    surfacing
    przemiany fazowe
    naprężenia spawalnicze
    pomiar naprężeń
    napawanie
    Opis:
    In work is presented a method of calculating elasto-plastic states in thermally loaded rods, which takes into account phase transformations that occur during surfacing by welding. Kinetics of phase transformations during heating and cooling is limited by temperature values at the beginning and at the end of austenitic transformation, while the progress of phase transformations during cooling is determined on the basis of TTT-welding diagram, basing on Johnson-Mehl-Avrami-Kolomogorov law for diffusional transformations and Koistinen-Marburger for martensitic transformation. Stress state of a bar subjected to thermo-mechanical loads is described assuming the planar cross section hypothesis and using integral equations of stress equilibrium of a bar as well as simple Hook’s law. Dependence of stresses from strains is assumed on the basis of tensile curves of particular structures, taking into account the influence of temperature. Computations of strains and stresses are investigated in a rod made of S235 steel, loaded by thermal fields generated by a point welding heat source of different intensities. The analysis of origination and development of plastic strains is carried out. In order to verify correctness of the model, experimental tests are carried out on a rod made of S235 steel surfaced with GMA method with geometry and welding parameters assumed in numerical simulations. Residual stresses, calculated taking into account phase transformations and for homogenous material model, are compared with experimental results.
    W pracy przedstawiono sposób obliczeń stanów sprężysto - plastycznych w prętach obciążonych cieplnie, z uwzględnieniem przemian fazowych zachodzących podczas napawania. Kinetykę przemian fazowych podczas nagizewania i chłodzenia limitują wartości temperatur początku i końca austenityzacji. natomiast postęp przemian podczas chłodzenia jest określony w oparciu o spawalniczy wykres ciągłego chłodzenia stali (CTPc-S). bazując na prawach Johnsona-Mehla-Avramiego-Kołomogorova (JMAK) w odniesieniu do przemian dyfuzyjnych i Koistinena-Marburgera dla martenzytycznej. Stan naprężenia pręta poddanego działaniu obciążeń cieplno-mechanicznych opisano przyjmując hipotezę płaskich przekrojów oraz korzystając z całkowych równań równowagi pręta Zależności naprężeń od odkształceń przyjęto na podstawie krzywych rozciągania poszczególnych struktur z uwzględnieniem wpływu temperatury. Wykonano obliczenia pola temperatury, przemian fazowych, odkształceń i naprężeń płaskownika wykonanego ze stali S235, obciążonego punktowym spawalniczym źródłem ciepła o różnej intensywności. Przeprowadzono analizę powstawania i rozwoju odkształceń plastycznych. W oelu weryfikacji poprawności modelu przeprowadzono badania doświadczalne płaskownika wykonanego ze stali S235 napawanego metodą GMA. o geometrii i parametrach napawania przyjętych w symulacjach numerycznych. Porównano naprężenia własne obliczone z uwzględnieniem przemian fazowych oraz dla modelu materiału jednorodnego z wynikami badań doświadczalnych.
    Źródło:
    Archives of Metallurgy and Materials; 2013, 58, 4; 1243-1252
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Effect of Type of Welding Sequence During Hardfacing Chromium Cast Iron for Erosion Resistance
    Autorzy:
    Gucwa, M.
    Bęczkowski, R.
    Winczek, J.
    Wyleciał, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/382472.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    wear resistant alloys
    hardfacing
    erosion
    welding
    hardness
    stopy odporne na zużycie
    napawanie
    erozja
    spawanie
    twardość
    Opis:
    The paper presents the capabilities of welding techniques to creating properties of wear resistant high chromium cast iron alloy. The use of the right kind of welding sequence allows you to change the structure and properties of the obtained welds. Tests were conducted for one type of additive material in the form of self shielded core wire. In order to determine the effect of the type of welding sequence on the properties of welds performed welding using string bead and weave bead. The resulting weld was tested on hardness and research structure in an optical microscope. In the following studies have been made erosive tests wear of made hardfacing. String beads gave structure rich in carbides and harder about 270 HV of the weld with weave bead. Also, wear resistance was nearly twice as better for welds made with string beads. In the experiment a decisive role in the resistance to wear plays a high hardness of the deposit and the presence of carbides in its structure. Changes in the basic parameters of the deposition process allows for the formation of structure and properties of hardfacing welds in a wide range.
    Źródło:
    Archives of Foundry Engineering; 2017, 17, 3; 51-54
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of thermal cycles and phase transformations during multi-pass ARC weld surfacing of steel casts taking into account heat of the weld
    Autorzy:
    Winczek, J.
    Gucwa, M.
    Makles, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/122834.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej
    Tematy:
    surface treatment
    temperature field
    phase transformations
    welding
    surfacing
    obróbka powierzchniowa
    przemiany fazowe
    pole temperatury
    spawanie
    napawanie
    Opis:
    In this work, a model of phase transformations during multipass weld surfaced steel casts is presented. In the temperature field calculation algorithm, the influence of the heat of overlaying beads and a self-cooling of previously overlayed beads have been taken into account. The fusion area, full and part transformation zones, by solidus, A1 and A3 and A A1 temperatures has been determined, respectively. The temperatures of the beginning and the end of the phase changes during cooling were determined on the basis of the time-temperature-transformation welding diagram. In the phase change kinetic description, the JMAK law and KM formula were used. Theoretical considerations are illustrated by example of volume share calculations of particular structural components during the weld surfaced 230-450 W steel cast. The results of computation in the graphical forms are presented: welding thermal cycle diagrams and structural share change histories at selected points, as well as temperature and the phase share distributions in cross section.
    Źródło:
    Journal of Applied Mathematics and Computational Mechanics; 2018, 17, 1; 89-100
    2299-9965
    Pojawia się w:
    Journal of Applied Mathematics and Computational Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Structure and Properties of Coatings Made with Self Shielded Cored Wire
    Autorzy:
    Gucwa, M.
    Winczek, J.
    Bęczkowski, R.
    Dośpiał, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/381066.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    wear resistant alloys
    metallography
    hardfacing
    carbides
    hardness
    cored wire
    stopy odporne na zużycie
    metalografia
    napawanie
    węgliki
    twardość
    drut rdzeniowy
    Opis:
    The welding technologies are widely used for design of protection layer against wear and corrosion. Hardfacing, which is destined for obtaining coatings with high hardness, takes special place in these technologies. One of the most effective way of hardfacing is using self shielded flux cored arc welding (FCAW-S). Chemical composition obtained in flux cored wire is much more rich in comparison to this obtained in solid wire. The filling in flux cored wires can be enriched for example with the mixture of hard particles or phases with specified ratio, which is not possible for solid wires. This is the reason why flux cored wires give various possibilities of application of this kind of filler material for improving surface in mining industry, processing of minerals, energetic etc. In the present paper the high chromium and niobium flux cored wire was used for hardfacing process with similar heat input. The work presents studies of microstructures of obtained coatings and hardness and geometric properties of them. The structural studies were made with using optical microscopy and X- ray diffraction that allowed for identification of carbides and other phases obtained in the structures of deposited materials. Investigated samples exhibit differences in coating structures made with the same heat input 4,08 kJ/mm. There are differences in size, shape and distribution of primary and eutectic carbides in structure. These differences cause significant changes in hardness of investigated coatings.
    Źródło:
    Archives of Foundry Engineering; 2016, 16, 3; 39-42
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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