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Effect of welding sequence on residual stress distributions in GTA welding of AA5251 plate
, Article International Journal of Materials Research ; Volume 103, Issue 3 , 2012 , Pages 371-377 ; 18625282 (ISSN) ; Serajzadeh, S ; Sharif University of Technology
Abstract
In this paper, a thermo-mechanical model has been used to predict the temperature history and residual stress distribution in gas tungsten arc welding of AA5251 plates. This model has also been utilized to estimate the residual stresses under different welding sequences, while in the model the effect of temperature on material properties were taken into account. In order to verify the predictions, residual stresses within the welded samples and weld pool geometry were experimentally measured employing hole drilling and macro-examination of weld cross-section, respectively. The comparison between numerical and experimental data shows a reasonable agreement. The predictions show that the...
Thermo-Mechanical Analysis of Gas Tungsten Arc Welding Process and Effect of Welding Sequence
, M.Sc. Thesis Sharif University of Technology ; Serajzadeh, Siamak (Supervisor) ; Kokabi, Amir Hossein (Supervisor)
Abstract
In this work, mathematical models are employed to predict transient temperature field, fluid flow within the melt zone and distribution of thermal and residual stresses during and after GTAW process. At the first step, fluid flow in the weld pool and transient temperature field within the metal being welded are determined by simultaneously solving the equations of conservation of mass, energy and momentum. To do so, a commercial finite volume base-program, FLUENT, is utilized. In the next step, temperature distribution during cooling as well as resulting thermal and residual stresses are predicted by means of a commercial finite element base program, ABAQUS. The employed models are capable...
Experimental investigation into the effects of weld sequence and fixture on residual stresses in Arc welding process
, Article Journal of Materials Engineering and Performance ; Volume 21, Issue 6 , June , 2012 , Pages 892-899 ; 10599495 (ISSN) ; Serajzadeh, S ; Sharif University of Technology
2012
Abstract
This study concentrates on the effects of weld sequence and welding fixtures on distribution and magnitude of induced arc welding residual stresses built up in butt-joint of Gas Tungsten Arc Welding (GTAW) AA5251 plates. Aluminum plates have been welded under different welding conditions and then, longitudinal and transverse residual stresses were measured in different points of the welded plates employing hole-drilling technique. The results indicate that welding sequence significantly alters the distributions of both longitudinal and transverse residual stresses while the changing in the weld sequence leads to 44% decrease in longitudinal residual stress. Besides, both the geometry of weld...
Effect of welding parameters on residual stresses in dissimilar joint of stainless steel to carbon steel
, Article Journal of Materials Science ; Volume 46, Issue 9 , 2011 , Pages 3225-3232 ; 00222461 (ISSN) ; Serajzadeh, S ; Kokabi, A. H ; Fischer, A ; Sharif University of Technology
2011
Abstract
In this study, a thermo-mechanical model was utilized to investigate the effects of welding parameters on the distribution of residual stresses in dissimilar TIG welds of low carbon and ferritic stainless steels. To solve the governing thermal and mechanical problems, a finite element program, ANSYS, was employed while the different aspects such as welding sequence and dilution were considered in the numerical solution. To validate the predictions, the model results were compared with the residual stresses measured by X-ray diffraction technique and a reasonable agreement was found. The results show that the magnitude of tensile residual stresses decrease as the welding current increases...