HIGH IMPACT FACTOR - 2.39

Heat Flow Condition of Electron Beam Welding using ANSYS

Author(s):

Harinadh Vemanaboina , Nalla Narasimha Reddy Education Society’s Group of Instititions, Hyderabad, Telangana State, India; K.B.G.Tilak, Nalla Narasimha Reddy Education Society’s Group of Instititions, Hyderabad, Telangana State, India; S.Tarun, Nalla Narasimha Reddy Education Society’s Group of Instititions, Hyderabad, Telangana State, India; S.Sumanth Reddy, Nalla Narasimha Reddy Education Society’s Group of Instititions, Hyderabad, Telangana State, India; T.Mahesh, Nalla Narasimha Reddy Education Society’s Group of Instititions, Hyderabad, Telangana State, India

Keywords:

EBW, Peclet Number, Heat Power Distribution, Ansys Simulation

Abstract

Electron Beam welding (EBW) is modelled using a basic Kaplan keyhole formation as in laser beam welding. As high penetration depth to width ratios can be obtained in this process, researchers and engineers are working in enhancing this vacuum based technology of joining the components. This welding technique has several applications in fusion reactor fabrication in various components like vacuum vessel and test blanket modules with different type of steels. This study is focussed on simulating and modelling EBW in terms of the heat flux flow with a surface heat on bead area in the form of Gaussian distribution and when the beam forms keyhole plasma, the heat flow conducted to the base metal is modelled as a frustum distribution. Unlike Laser beam welding, in EBW a portion of the heat would leave out to ambience through the lower end of the bead, this amount of heat is to be apportioned. The heat flow mechanism is calculated using Peclet number from which with empirical formulae power distribution is determined. Peclet number variation as a function of radial distance, penetration depth & distance from wall is calculated. The values obtained may not be directly used in analysis but a correlation is obtained which helps formulating a finite element analysis. The process of weld is evaluated using temperature profiles distributions in weld zone (WZ) and heat affected zone (HAZ) using Ansys software. Weld material used is SS304 and temperature dependent thermal and structural properties are considered. The output obtained is the thermal isotherms around the weld to estimate the heat flux distribution on surface and through the keyhole. The scope of applications where the heat flow is distributed as % contribution would provide guidance in structural joints as in nuclear reactor fabrication applications.

Other Details

Paper ID: RTIMEP032
Published in: Conference 7 : RTIME-2k16
Publication Date: 01/05/2016
Page(s): 183-187

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