Comparative analysis of TIG welding distortions between austenitic and duplex stainless steels by FEM

Abstract In this study, thermal stress analyses were performed in the tungsten inert gas (TIG) welding process of two different stainless steel specimens in order to compare their distortion mode and magnitude. The growing presence of non-conventional stainless steel species like duplex family generates uncertainty about how their material properties could be affected under the welding process. To develop suitable welding numerical models, authors must consider the welding process parameters, geometrical constraints, material non-linearities and all physical phenomena involved in welding, both thermal and structural. In this sense, four different premises are taken into account. Firstly, all finite elements corresponding to the deposition welding are deactivated and, next, they are reactivated according to the torch’s movement to simulate mass addition from the filler metal into the weld pool. Secondly, the movement of the TIG torch was modelled in a discontinuous way assuming a constant welding speed. Thirdly, the arc heat input was applied to the weld zone using volumetric heat flux distribution functions. Fourthly, the evolution of the structural response has been tackled through a stepwise non-linear coupled analysis. The numerical simulations are validated by means of full-scale experimental welding tests on stainless steel plates. Finally, the results and conclusions of this research work are exposed.

[1]  Lars-Erik Lindgren,et al.  Deformations and stresses in welding of shell structures , 1988 .

[2]  M. Pinar Mengüç,et al.  Thermal Radiation Heat Transfer , 2020 .

[3]  K. Bathe.  Finite Element Procedures , 1995 .

[4]  Yuh J. Chao,et al.  Effects of temperature-dependent material properties on welding simulation , 2002 .

[5]  Pradip Dutta,et al.  Effects of mould filling on evolution of the solid-liquid interface during solidification , 2009 .

[6]  Artem Pilipenko,et al.  Computer Simulation of Residual Stress and Distortion of Thick Plates in Multielectrode Submerged Arc Welding : Their Mitigation Techniques , 2001 .

[7]  Erdogan Madenci,et al.  The Finite Element Method and Applications in Engineering Using ANSYS , 2007 .

[8]  S. J. Salon,et al.  Introduction to Finite Elements , 1995 .

[9]  J. Z. Zhu,et al.  The finite element method , 1977 .

[10]  Antonio Blázquez,et al.  A simplified numerical analysis of residual stresses in aluminum welded plates , 1996 .

[11]  Samuel Paolucci,et al.  Numerical simulation of filling and solidification of permanent mold castings , 2002 .

[12]  P. J. García Nieto,et al.  Non-linear analysis of the tubular ‘heart’ joint by FEM and experimental validation , 2007 .

[13]  P. Krishna Iyer,et al.  Numerical simulation of welding and quenching processes using transient thermal and thermo-elasto-plastic formulations , 1996 .

[14]  W. Wolfe,et al.  The Infrared Handbook , 1985 .

[15]  Paolo Frosi,et al.  Multipurpose ANSYS FE procedure for welding processes simulation , 2009 .

[16]  Yuh J. Chao,et al.  Numerical simulation of transient temperature and residual stresses in friction stir welding of 304L stainless steel , 2004 .

[17]  R. Cook,et al.  Concepts and Applications of Finite Element Analysis , 1974 .

[18]  P. J. García Nieto,et al.  Nonlinear thermal optimization of external light concrete multi-holed brick walls by the finite element method , 2008 .

[19]  Pierluigi Mollicone,et al.  Alternative simulation techniques for distortion of thin plate due to fillet-welded stiffeners , 2006 .

[20]  Nilanjan Chakraborty,et al.  The effects of turbulence on molten pool transport during melting and solidification processes in continuous conduction mode laser welding of copper–nickel dissimilar couple , 2009 .