مقاله جوشکاری با عنوان : Electrical contact resistance effect on resistance spot welding P.S. Wei a,., T.H. Wub   چکیده : The effects of local electrical contact resistance on transport variables, cooling rate, solute distribution,and nugget shape after solidification responsible for microstructure of the fusion zone during resistancespot welding are realistically and systematically investigated. The model accounts for electromagneticforce, heat generation and contact resistances at the faying surface and electrode–workpiece interfacesand bulk ...

مقاله جوشکاری با عنوان : The effects of the welding current on heat input, nugget geometry, and the mechanical and fractural properties of resistance spot welding on Mg/Al dissimilar materials   Fatih Hayat  چکیده :   Investigating the joining capability of magnesium AZ31 alloy sheets and aluminium 1350 alloy sheetswith the application of resistance spot welding was the objective of this study. The weld current valuesused in the welding process of Al–Mg sheets were 22, 23, 25, 27, 29, 31, and 33 kA. The studies examinedthe nugget geometries of ...

مقاله جوشکاری با عنوان : New parametric study of nugget size in resistance spot welding process using finite element method   Hamid Eisazadeh a,*, Mohsen Hamedi b, Ayob Halvaee   چکیده : Resistance spot welding process (RSW) is one of important manufacturing processes in automotiveindustry for assembling bodies. Quality and strength of the welds and therefore body mainly are definedby quality of the weld nuggets. The most effective parameters in this process are: current intensity, weldingtime, sheet thickness and material, geometry of electrodes, ...

مقاله جوشکاری با عنوان : Welding time effect on mechanical properties of automotivesheets in electrical resistance spot welding S. Aslanlar a,*, A. Ogur b, U. Ozsarac a, E. Ilhan a   چکیده: In this study, the effects of welding time on the tensile-peel strength and tensile-shear strength of welding joints in electrical resistancespot welding of chromate micro-alloyed steel sheets having 1.2 mm thicknesses were investigated. A timer and current controlled electricalresistance spot welding machine having 120 kV A capacity and a pneumatic application mechanism ...

مقاله جوشکاری با عنوان : Effects of Welding Parameters and Surface Pretreatments on ResistanceSpot Welding of AZ31B Mg Alloy Shiquan Zhou1, Lei Liu2,3, Jae Pil Jung4,*, Mok-Young Lee5, and Y. Norman Zhou3 چکیده : The resistance spot weldability of AZ31B magnesium alloy using AC (alternating current) was investigatedin this paper. The surfaces of sheet coupons were prepared by acetone cleaning (as-received) and some couponswere also cleaned with chromic acid (H2Cr2O7) after acetone cleaning (acid-cleaned). The surfaces of theas-received AZ31B sheets consisted of ...

مقاله جوشکاری با عنوان : Resistance Spot Welded AZ31 Magnesium Alloys, Part II:Effects of Welding Current on Microstructure and MechanicalPropertiesL. LIU, L. XIAO, J.C. FENG, Y.H. TIAN, S.Q. ZHOU, and Y. ZHOU چکیده: Resistance spot welding of AZ31 magnesium alloys from different suppliers, AZ31-SA (fromsupplier A) and AZ31-SB (from supplier B), was studied and compared in this article. Themechanical properties and microstructures have been studied of welds made with a range ofwelding currents. For both groups of welds, the tension-shear fracture load (FC) and ...

مقاله جوشکاری با عنوان : Resistance-Spot-Welded AZ31 Magnesium Alloys:Part I. Dependence of Fusion Zone Microstructureson Second-Phase ParticlesL. XIAO, L. LIU, Y. ZHOU, and S. ESMAEILI چکیده: A comparison of microstructural features in resistance spot welds of two AZ31 magnesium(Mg) alloys, AZ31-SA (from supplier A) and AZ31-SB (from supplier B), with the same sheetthickness and welding conditions, was performed via optical microscopy, scanning electronmicroscopy (SEM), X-ray diffraction (XRD), and transmission electron microscopy (TEM).These alloys have similar ...

مقاله جوشکاری به عنوان : FINITE ELEMENT MODELING OF RESISTANCE SPOT WELDINGPROCESSP. Chigurupati*, B.K Chun, A. Bandar, W.T WuScientific Forming Technologies Corporation2545 Farmers Drive, Suite 200, Columbus, OH 43235, USA چکیده:  ABSTRACT: Weld quality in Resistance Spot Welding is directly influenced by competing process transients. Thesetransients are caused by electrical, thermal, mechanical and metallurgical interactions. Controlling the process variablessuch as current, clamping force and welding time requires good understanding of how these interactions ...

مقاله جوشکاری با عنوان: RESISTANCE SPOT WELDING OF MAGNESIUMALLOY SHEETS WITH COVER PLATES S. Satonaka, C. Iwamoto, G.-i. Murakamiand Y. Matsumoto چکیده مقاله: Lightweight materials such as high-strength steels and aluminum alloys are widely used in automotive componentsfor the purposes of weight reduction and consequent higher fuel effi ciency. As new alloys have beendeveloped, magnesium alloys have become attractive for the production of automotive components due totheir unique properties, such as high specifi c strength, damping capacity, and recyclability. ...

مقاله جوشکاری با عنوان : Metallurgy and mechanical performance of AZ31 magnesium alloy friction spot welds Leonardo Contri Campanellia,∗, Uceu Fuad Hasan Suhuddinb, Armando Ítalo Sette Antoniallia,Jorge Fernandez dos Santosb, Nelson Guedes de Alcântaraa, Claudemiro Bolfarini   چکیده مقاله: Microstructural features were studied along the cross-section of AZ31 magnesium alloy friction spotwelded joints made using different combinations of welding parameters. Static lap shear testing was performedto evaluate the mechanical properties of ...