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Studies on multipass welding with trailing heat sink considering phase transformation
Affiliation:1. Department of Mechanical Engineering, Indian Institute of Technology Madras, Chennai 600036, India;2. Department of Metallurgical and Materials Engineering, Indian Institute of Technology Madras, Chennai 600036, India;1. SMBS,Vit University, Vellore, Tamilnadu, India;2. sreyas institute of engineering & technology, India;3. Institute for Plasma Research, Gandhinagar, Gujarat, India;1. Escuela de Graduados, Facultad de Ciencias Veterinarias, Universidad Austral de Chile, PO Box 567, Valdivia, Chile;2. Instituto de Producción Animal, Facultad de Ciencias Agrarias, Universidad Austral de Chile, Valdivia, Chile;3. Facultad de Ciencias Agronómicas, Universidad de Chile, Santiago, Chile;1. School of Chemical Engineering, Northwest University, Xi’an 710069, PR China;2. Chemical Research Institute, Northwest University, Xi’an 710069, PR China;3. College of Chemistry & Materials Science, Northwest University, Xi’an 710069, PR China;4. School of Chemistry and Chemical Engineering, University of South China, Heng yang 421001, PR China
Abstract:A two pass butt welding of 6 mm mild steel plates was simulated using 3D finite element model using temperature and phase dependent material properties. Material phase transformations were simulated using suitable phase transformation kinetic models. Mechanical analysis is carried out using nodal temperature and phase proportions as input. Experiments were carried out using liquid nitrogen (LN2) as trailing heat sink. Trailing heat sink helped to reduce the residual stress in the fusion zone (FZ) and heat affected zone (HAZ) although distortions were found be increasing. A parametric study was conducted to study the effect of distance between weld arc and trailing heat sink. The heat sink closer to weld arc reduced both distortions and residual stresses.
Keywords:Multipass welding  Phase transformation  Trailing heat sink  Distortion  Residual stress  FEM
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