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EFFICIENT ESTIMATION OF VOLUMETRIC HEAT SOURCE IN FUSION WELDING PROCESS SIMULATION

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Title EFFICIENT ESTIMATION OF VOLUMETRIC HEAT SOURCE IN FUSION WELDING PROCESS SIMULATION
 
Creator BAG, S
KIRAN, DV
SYED, AA
DE, A
 
Subject Fusion welding
Numerical simulation
Volumetric heat source
FINITE-ELEMENT MODEL
GAS TUNGSTEN
ARC WELDS
POOL
PREDICTION
DISTORTION
GEOMETRY
INPUT
STEEL
FLOW
 
Description Mathematical models of heat transfer phenomena in fusion welding process can provide important physical insight on the mechanism of weld pool development, and compute temperature field and final weld dimensions fairly reliably in several welding systems. In particular, the conduction heat transfer based numerical models are relatively simpler and computationally inexpensive in comparison to the comprehensive heat transfer and fluid flow models although the later can undertake greater physical attributes in weld pool. One significant requirement of the conduction heat transfer based models is the predetermination of a volumetric source term to account for the heat input from the welding heat source. We present here two efficient approaches to define the volumetric heat source term which do not require a-priori information of the final weld joint dimensions, which has always remained a difficult task. The first approach involves an intrinsic mapping of the heat source geometry with the numerically computed melt pool dimensions within the framework of modeling calculations in an iterative manner and is validated for the prediction of final weld dimensions in autogenous gas tungsten arc welds with butt joint geometry. The other approach involves an analytical estimation of the volumetric source term as function of only the welding conditions and the initial weld joint geometry and is examined successfully for the prediction of weld pool dimensions and thermal cycles in tandem submerged arc welds with typical groove joint geometry.
 
Publisher INT INST WELDING
 
Date 2014-10-17T05:25:13Z
2014-10-17T05:25:13Z
2012
 
Type Article
 
Identifier WELDING IN THE WORLD, 56(11-12)88-97
http://dspace.library.iitb.ac.in/jspui/handle/100/16061
 
Language en