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Mathematical modelling of welding : sensitivity of residual stresses and thermal dilatations on welding parameters
Author(s)
Philander, Oscar
Date Issued
1998
Type
Thesis
Publisher
Peninsula Technikon
Abstract
In South Africa, the determination of residual stress distribution and undesirable
metallurgical phase fractions that are formed in components during welding are been
dealt with in a destructive or semi-destructive manner. This dissertation is an attempt
at enhancing the acquisition of residual components found in welded structures. It
shows how finite element methods can be used to obtain these results.
TIG welding is modeled as a thermo-mechano-metallurgical (TMM) problem. The
mathematical and finite element models for welding described in this study is based
on the work performed by Ronda and Oliver. These models has not yet fully been
incorporated into any of the existing computational tools and therefor, a commercial
computational software program, SYSWELD 2, was employed to perform the
welding simulations. The Leblond material models are incorporated into this software
program, and the model that is used for this study is described in this text.
Computational simulations were performed to study the effects that the sensitivity of
welding parameters would have on the resulting shape and size of Heat Affected
Zones, depth and width of penetration, temperature fields, metallurgical solid phase
fractions, as well as residual stress distribution and deformation. The results of these
simulations were compared to laboratory experiments.
metallurgical phase fractions that are formed in components during welding are been
dealt with in a destructive or semi-destructive manner. This dissertation is an attempt
at enhancing the acquisition of residual components found in welded structures. It
shows how finite element methods can be used to obtain these results.
TIG welding is modeled as a thermo-mechano-metallurgical (TMM) problem. The
mathematical and finite element models for welding described in this study is based
on the work performed by Ronda and Oliver. These models has not yet fully been
incorporated into any of the existing computational tools and therefor, a commercial
computational software program, SYSWELD 2, was employed to perform the
welding simulations. The Leblond material models are incorporated into this software
program, and the model that is used for this study is described in this text.
Computational simulations were performed to study the effects that the sensitivity of
welding parameters would have on the resulting shape and size of Heat Affected
Zones, depth and width of penetration, temperature fields, metallurgical solid phase
fractions, as well as residual stress distribution and deformation. The results of these
simulations were compared to laboratory experiments.
Additional information
Thesis (MTech (Mechanical Engineering))--Peninsula Technikon, 1998.
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192044389_Philander_O_Mtech_Mech_Eng_1998_9001519.pdf
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Thesis
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