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  • 1
    Electronic Resource
    Electronic Resource
    Metallurgical Investigations of Laser Welding of AISI 304 Stainless Steel (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 580-582 (June 2008), p. 41-44 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Laser welding of AISI 304 stainless steel was carried out by pulsed Nd:YAG lasermachine under different welding conditions. Geometrical shape of the joints was circular butt.Studies were focused on laser power, welding velocity, beam diameter and pulse duration.Microstructure of welded joints was investigated by optical microscopy (OM) and scanning electronmicroscopy (SEM). OM and SEM results show no evidence of grain growth in heat affected zone(HAZ). In addition, columnar and equiaxed grains are observed in the weld metal. Various defectssuch as lack of fusion, underfill, porosity, hot crack and mismatch are observed as a result ofimproper welding conditions. The best welding conditions to obtain minimum defects are presented
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/18/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.580-582.41.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    Experimental and Numerical Investigations of Residual Stress Distributions in the TIG Welding Process (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 580-582 (June 2008), p. 331-334 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Residual stresses are produced in weldments due to mismatching and non-uniformdistributions of plastic and thermal strains. Attempts were made to analyze the residual stressesdistributions produced in the TIG welding process using 2d and 3d finite element analyses. Noattempts were made to find the optimum shape of grooves and gas flow rate to minimize the tensileresidual stresses in the weldments, yet. In this paper, the effects of geometry configurations andinert gas flow rate on the residual stress distributions are presented using the thermo-elastoplasticconstitutive equations and compared with the x-ray diffraction method. In this study, convectiondue to both air and inert gas flow rate along with conduction and radiation are considered
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/18/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.580-582.331.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    Numerical Studies of Explosive Welding of Three-Layer Cylinder Composites-Part 2 (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 580-582 (June 2008), p. 327-330 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Finite element simulations of the experimental tests to explosively weld three layers ofAl5056, Al6061 and SS304L tube composites, using various stand-off distances and explosiveratios, are presented in this study. The Williamsburg equations of state and Johnson-Cookconstitutive equations were used to describe the behaviors of the explosive and the tubes,respectively. In this paper, the external parameters (dynamic angle and collision velocity) arerelated to the physical parameters (shear stress and plastic strain). The numerical results showedthat very high localized plastic deformation was produced at the bond interface. Moreover, it wasfound that the shear stress magnitude and signs can provide the necessary criteria for bonding. Inaddition, the sufficient criterion for bonding was found to be the magnitude of the plastic strainproduced at the collision point. The new welding window based on the internal parameters isproposed
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/18/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.580-582.327.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    Experimental Investigations on Explosive Cladding of Cp-Titanium (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 580-582 (June 2008), p. 629-632 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The purpose of this study is to produce composite plates by explosive cladding process.This is a process in which the controlled energy of explosives is used to create a metallic bondbetween two similar or dissimilar materials. The welding conditions were tailored through parallelgeometry route by using different explosive ratios to produce both wavy and straight interfaces. Inthis investigation, a two-pronged study was adopted to establish the conditions required forproducing successful solid state welding: (a) Analytical calculations to determine the weldabilitywindow; (b) Metallurgical investigations of experiments carried out under different conditions. Therequired parameters in the experiments were selected through numerical simulations. The analyticalcalculations confirm the experimental results. Optical microscopy studies show that a transitionfrom a smooth to wavy interface occurs with increase in explosive ratio. Scanning electronmicroscopy studies show the formation of intermetallic layer in the interface
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/19/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.580-582.629.pdf
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  • 5
    Electronic Resource
    Electronic Resource
    Experimental Investigations of Explosive Welding of Three-Layer Cylinder Composites-Part 1 (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 580-582 (June 2008), p. 323-326 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Study of current attachment at thermionic cathode for TIG arc at atmospheric pressure isattempted from numerical calculations of arc-electrodes unified model. The calculations show thatthe maximum temperature of arc plasma close to the cathode tip for W-2% ThO2 reaches 19,000 Kand it is the highest value in comparison with the other temperatures for W-2% La2O3 and W-2%CeO2, because the current attachment at the cathode tip is constricted by a centralized limitation ofliquid area of ThO2 due to its higher melting point. The calculations also show that, in cases of W-2% La2O3 and W-2% CeO2, the liquid areas of La2O3 and Ce2O3 are widely expanded at the cathodetip due to their lower melting points and then produce uniform current attachments at the cathode. Itis concluded that the current attachment at thermionic cathode is strongly dependent on workfunction, melting point and Richardson constant of emitter materials
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/18/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.580-582.323.pdf
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  • 6
    Electronic Resource
    Electronic Resource
    Experimental and Numerical Studies of the Effects of Process Parameters in the Continuous Friction Welding Process (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 580-582 (June 2008), p. 335-338 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: All of the experiments performed on friction welding combinations of 304SS and mildsteel are modeled using the ABAQUS code and the Johnson-cook equation is used to definecoupled thermo-mechanical properties of materials. The variations of temperature, von-Misesstress, plastic strain, and strain rate during continuous welding are systematically investigated andanalyzed. The calculated results of temperature distribution are in good agreement with the infrareddetected ones. The numerically calculated results for the shape of the welded joint also show anexcellent fit with experimental observations. The von-Misses stress and equivalent straindistributions are more influenced by the initial pressure than the final pressure. Themetallographical examinations, hardness and tensile tests of the samples are carried out. In all thetension tests carried out the samples were broken from their base metals and not the welds
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/18/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.580-582.335.pdf
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  • 7
    Electronic Resource
    Electronic Resource
    Effect of Post Weld Heat Treatment on the Interface Microstructure of Explosively Welded Titanium/Stainless Steel Composite Clad (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 580-582 (June 2008), p. 29-32 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: In this study, the microstructure evolutions of the interface of the explosively welded cp-Ti/AISI 304 S.S composites due to heat treatment are presented. The composites were subjected toheat treatment process at various ranges of 650-950°C in argon atmosphere for 1hr. Theinvestigations were carried out by using optical microscopy (OM), scanning electron microscopy(SEM), energy dispersive spectrometry (EDS) and X-ray diffraction (XRD). The results reveal thepresence of reaction layers in the interface and show that heat treatments cause to form differentintermetallic phases at the interface. In addition, it is found that the width of the interfacial layerincreases with temperature. Fractographical studies of the lug-shear test samples show theformation of river patterns and kirkendal pore structures on the Ti-side of the interface
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/18/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.580-582.29.pdf
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