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    Wyświetlanie 1-7 z 7
    Tytuł:
    Optimization of process parameters of friction stir welded AA5082-AA7075 butt joints using resonance fatigue properties
    Autorzy:
    Kumar, G.
    Kumar, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/200299.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    friction stir welding
    dissimilar Al welding
    resonance fatigue analysis
    fracture surface analysis
    ANOVA
    Opis:
    In this work, experiments were carried out to quantify the behaviour of friction stir welded (FSW) AA5082-AA7075 butt joints under tensile loading and completely reversed fatigue loading. Different samples were prepared to identify optimum tool rotational and travel speeds to produce FSW AA5082-AA7075 butt joints with the maximum fatigue life. ANOVA was performed, which confirmed that both tool speed nad tool rotation speed affect the tensile strength of the weld. The samples exhibit a considerable difference in their fatigue life and tensile strenght. This difference can be accounted to the presence of welding defects such as surface defects and porosity. S-N curve plotted for the sample shows a significantly high fatigue life at the lower stress ranges. Fracture surfaces were also analysed under scanning electron microscope (SEM). Study of the fracture surface of the sample that failed under fatigue loading showed that the surface was mainly divided in two zones. The first zone was the area of fatigue crack growth where each stress cycle, slowly and gradually, helped in the growth of crack. The second zone was the region of fast fracture where the crack growth resulted in the failure of the joint instantaneously. The fracture surface study of the sample that failed under tensile loading showed that the mode of failure was ductile in nature.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2020, 68, 1; 99-108
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Prediction and Optimization of Magnetic Properties of Laser Welded AISI 430 Stainless Steels
    Autorzy:
    Mostaan, H.
    Rafiei, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/353110.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    AISI 430
    response surface methodology
    laser welding
    magnetic properties
    Opis:
    The AISI 430 stainless steel with ferritic structure is a low cost material for replacing austenitic stainless steel because of its higher yield strength, higher ductility and also better polarisation resistance in harsh environments. The applications of AISI 430 stainless steel are limited due to insignificant ductility and some undesirable changes of magnetic properties of its weld area with different microstructures. In this research, a study has been done to explore the effects of parameters of laser welding process, namely, welding speed, laser lamping current, and pulse duration, on the coercivity of laser welded AISI 430 stainless steel. Vibrating sample magnetometery has been used used to measure the values of magnetic properties. Observation of microstructural changes and also texture analysis were implemented in order to elucidate the change mechanism of magnetic properties in the welded sections. The results indicated that the laser welded samples undergo a considerable change in magnetic properties. These changes were attributed to the significant grain growth which these grains are ideally oriented in the easiest direction of magnetization and also formation of some non-magnetic phases. The main effects of the above-mentioned factors and the interaction effects with other factors were evaluated quantitatively. The analysis considered the effect of lamping current (175-200 A), pulse duration (10-20 ms) and travel speed (2-10 mm/min) on the coercivity of laser welded samples.
    Źródło:
    Archives of Metallurgy and Materials; 2018, 63, 4; 1673-1682
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    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:
    Optimization of process parameters of friction stir welded AA 5083-O aluminum alloy using Response Surface Methodology
    Autorzy:
    Jannet, S.
    Mathews, P. K.
    Raja, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/202208.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    friction stir welding
    optimization
    Response Surface Analysis
    Analysis of Variance
    tensile strength
    spawanie
    tarcie
    optymalizacja
    RSA
    wytrzymałość na rozciąganie
    Opis:
    A methodology was exhibited to create the experimental model for assessing the Ultimate Tensile Strength of AA 5083-O aluminum compound which is broadly utilized as a part of boat building industry by Friction Stir Welding (FSW). FSW process parameters, such as: tool rotational speed, welding speed, and axial force were optimized for better results. FSW was completed considering three-component 3-level Box Behnekn Design. Response surface Methodology (RSM) was implemented to obtain the relationship between the FSW process parameters and ultimate Tensile Strength. Analysis of Variance (ANOVA) procedure was utilized to check the aptness of the created model. The FSW process parameters were additionally streamlined utilizing Response Surface Methodology (RSM) to augment tensile strength. The joint welded at a rotational speed of 1100 rpm, a welding speed of 75 mm/min and a pivotal energy of 2.5 t displays higher tensile strength compared with different joints in comparison with other joints.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2015, 63, 4; 851-855
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Techniki spawalnicze w odlewnictwie. Napawanie
    Welding Technology in Foundry
    Autorzy:
    Wojciechowski, W.
    Kowalski, J. S.
    Powiązania:
    https://bibliotekanauki.pl/articles/383086.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    naprawa odlewu
    technika spawalnicza
    wada odlewu
    pomiar twardości
    mikrostruktura powierzchni
    cast repair
    welding technique
    cast defect
    hardness test
    surface microstructure
    Opis:
    W artykule omówiono problemy związane z naprawami wad odlewniczych. Przeanalizowano możliwości naprawy odlewów metodami spawalniczymi. Opisano technologię naprawy przez napawanie wlewnic wykonanych z żeliwa szarego. Napawanie prowadzono ręcznie elektrodami otulonymi oraz w osłonie gazów metodą MAG. Oceniono mikrostrukturę stref napawanych naprawianych odlewów oraz wyniki pomiarów twardości i rozkład mikrotwardości.
    In this paper discusses issues related to the repair of large castings. Analyzed the possibility repair of castings of welding methods. Describes the technology of repair by welding of cast iron ingot molds. Welding with coated electrodes was carried out manually and gas shielded MAG. Rated zones padded structure and performance measurement and distribution of microhardness.
    Źródło:
    Archives of Foundry Engineering; 2013, 13, 1 spec.; 87-90
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Repair of Structural Steel Surface Groove by Using Diffusion Welding of Pure Iron Powder
    Autorzy:
    Rahimy, Y.
    Vahdat, S. E.
    Powiązania:
    https://bibliotekanauki.pl/articles/380060.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    tensile strength
    useful life
    steel surface cracks
    diffusion welding
    repair
    magnetic induction
    wytrzymałość na rozciąganie
    użytkowanie
    pęknięcia powierzchni
    naprawa
    zgrzewanie dyfuzyjne
    Opis:
    Metal pieces wear out due to variable loading, because cracks formed on their surface of them. In order to increase useful life of metal pieces with the help of different methods of welding, surface cracks are repaired. In this research, performance of the diffusion welding of pure iron powder through magnetic induction evaluated for repairing structural steel surface cracks. First, four specimens prepared including one control specimen and other three specimens grooved specimens in length of 6.25mm and in depth of 1mm and groove width in the sizes of 0.5, 0.75 and 1mm. Then by a coil, the induced current created in the piece surface. After crossing the current, the powder melted and the groove repaired due to diffusion welding. To prevent oxidation, the atmosphere inside the coil filled with argon gas. The results show that after repairing surface groove, tensile strength of the repaired specimens reached to the tensile strength of control specimen with the margin of 7.5%
    Źródło:
    Archives of Foundry Engineering; 2016, 16, 2; 105-110
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modeling and parametric optimization of friction stir welding of aluminium alloy AA7068-T6 using response surface methodology and desirability function analysis
    Autorzy:
    Bindu, M. D.
    Tide, P. S.
    Bhasi, A. B.
    Ramachandran, K. K.
    Powiązania:
    https://bibliotekanauki.pl/articles/2086852.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    AA7068-T6
    friction stir welding
    response surface method
    desirability function
    zgrzewanie tarciowe z mieszaniem
    metoda powierzchni odpowiedzi
    funkcja spełnienia wymagań
    Opis:
    In this investigation, high specific strength precipitation hardenable alloy AA7068-T6 was joined using friction stir welding. Experiments were carried out using the three factor-three level central composite face-centered design of response surface methodology. Regression models were developed to assess the influence of tool rotational speed, welding speed, and axial force on ultimate tensile strength and elongation of the fabricated joints. The validity of the developed models was tested using the analysis of variance (ANOVA), actual and adjusted values of the regression coefficients, and experimental trials. The analysis of the developed models together with microstructural studies of typical cases showed that the tool rotational speed and welding speed have a significant interaction effect on the tensile strength and elongation of the joints. However, the axial force has a relatively low interaction effect with tool rotational speed and welding speed on the strength and elongation of the joints. The process variables were optimized using the desirability function analysis. The optimized values of joint tensile strength and elongation – 516 MPa and 21.57%, respectively were obtained at a tool rotational speed of 1218 rpm, welding speed of 47 mm/ min, and an axial force of 5.3 kN.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2021, 69, 4; e137936, 1--9
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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