Record Details

Use of a multivariate optimization algorithm to develop a self-consistent numerical heat transfer model for laser spot welding

DSpace at IIT Bombay

View Archive Info
 
 
Field Value
 
Title Use of a multivariate optimization algorithm to develop a self-consistent numerical heat transfer model for laser spot welding
 
Creator BAG, S
TRIVEDI, A
DE, A
 
Subject pool
prediction
conduction
steels
shape
flow
laser beam welding
numerical modeling
heat transfer analysis
multivariate optimization
 
Description Laser spot welding as a joining method offers many outstanding advantages, such as localized heating and melting, high weld-strength-to-weld-size ratio, and minimal heat affected zone. These provide the benefits of low heat distortion, repeatability, ability to automate and high throughout that are always in demand in industry. An accurate knowledge of the temperature-time history of the weld pool is a prerequisite for reliable prediction of the weld dimensions, final microstructure and mechanical properties of the weld joint. Measurement of the weld thermal cycle in the laser weld pool is nearly impossible due to high peak temperature, rapid melting and solidification, and the complex flow of liquid metal within a small weld pool. Mathematical modeling of the laser spot welding process has emerged as a useful tool for the prediction of the temperature-time history and weld pool dimensions. However, the reliability of the predicted values of temperature history and weld dimensions significantly depends on the accuracy of the input parameters provided in such models. For example, the value of the absorption coefficient is a significant input parameter for modeling the laser spot welding process. However, the same is rarely available with adequate reliability and is also difficult to assign from scientific principles alone. This work presents a novel mathematical framework where the values of a set of uncertain input parameters for mathematical modeling are identified inherently by integrating a finite element based heat transfer simulation using adaptive volumetric heat source and a multivariate optimization algorithm.
 
Publisher SPRINGER LONDON LTD
 
Date 2011-10-22T07:16:29Z
2011-12-15T09:10:48Z
2011-10-22T07:16:29Z
2011-12-15T09:10:48Z
2008
 
Type Article; Proceedings Paper
 
Identifier INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY,38,575-585
0268-3768
http://dx.doi.org/10.1007/s00170-007-1101-1
http://dspace.library.iitb.ac.in/xmlui/handle/10054/14839
http://hdl.handle.net/100/1666
 
Source 1st International and 22nd All India Manufacturing Technology Design and Research Conference,Roorkee, INDIA,DEC 21-23, 2007
 
Language English