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Permanent link (DOI): https://doi.org/10.7939/R3QB9VD4W

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Finite Element Model of the Thermal Profile During Submerged Arc Welding with One and Two Electrodes Open Access

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Other title
Subject/Keyword
Submerged arc welding
SAW
Modelling of submerged arc welding
Modelling of SAW
Modelling
Finite element method
FEM
Finite element method SAW
Thermal profile
Temperature profile
Modelling temperature profile
Instrumented thermocouples
Varying thermal properties
Simulation
Simulation of SAW
Simulation of welding
FEM modelling of SAW
Quasi-steady state
Heat transfer in welding
Point source
Double ellipsoid source
Two electrode welding
Welding with two electrodes
Instrumented welds
Sensitivity of the thermal properties
Welding of X70
Welding of pipelines
Statistical analysis
Bead shape parameters
Removing outliers
Simulation of welding with COMSOL
Mixed boundary condition
Simulation with two point sources
Infinite elements
Application of infinite elements to welding
Heat tranfer in moving coordinate system
Welding
Multiple electrode welding
Sensitivity analysis
Sensitivity analysis on submerged arc welding
Sensitivity analysis on SAW
Temperature measurement during a welding operation
Temperature measurement during submerged arc welding
Temperature measurement during SAW
Modelling temperature profile during welding
Modelling temperature profile during submerged arc welding
Modelling temperature profile during SAW
Type of item
Thesis
Degree grantor
University of Alberta
Author or creator
Lecoanet, Alexandre J L
Supervisor and department
Henein, Hani (Department of Chemical and Materials Engineering)
Ivey, Douglas (Department of Chemical and Materials Engineering)
Examining committee member and department
Henein, Hani (Department of Chemical and Materials Engineering)
Ivey, Douglas (Department of Chemical and Materials Engineering)
Luo, Jingli (Department of Chemical and Materials Engineering)
Elliott, Janet (Department of Chemical and Materials Engineering)
Department
Department of Chemical and Materials Engineering
Specialization
Chemical Engineering
Date accepted
2016-06-08T13:19:16Z
Graduation date
2016-06:Fall 2016
Degree
Master of Science
Degree level
Master's
Abstract
The submerged-arc welding (SAW) process is used extensively in the manufacturing of pipes. The heat flow introduced by the welding operation has a significant impact on the properties of both the weld metal and the heat affected zone (HAZ). The work presented in this thesis aims to develop a numerical heat flow model to predict the temperature profile in piece welded using SAW as a function of the welding parameters. Measurement were done using instrumented thermocouples during an operation of SAW with one electrode. The models were then compared to the measurements and a sensitivity analysis was carried out on the density, the specific heat, the parameter called “ff” in the double ellipsoid model, and the Neumann boundary condition. The three models used are a point source model giving results similar to Rosenthal’s results, a model using a double ellipsoid heat source with constant thermal properties, and a model using a double ellipsoid heat source with varying thermal properties. The presence of the thermocouples linked to the data acquisition system used in the experiment disturbed the weld but workable data were still extracted. Then the comparison between the measurement and the simulations showed that the most accurate model is the one using a double ellipsoid heat source with varying thermal properties. It predicts well the heating and the cooling phases of all the temperature profiles recorded but it predicts the peak well only for the thermocouples located around 12 mm from the center of the plate closer it overestimates the peak. The sensitivity analysis showed that the most sensitive parameters are the thermal properties. It also showed that the parameter called “ff” in Goldak’s approach is sensitive. The Neumann boundary condition is not a sensitive parameter. Also when measurements are done using thermocouples close to the knowing the exact location of the thermocouples is crucial.
Language
English
DOI
doi:10.7939/R3QB9VD4W
Rights
This thesis is made available by the University of Alberta Libraries with permission of the copyright owner solely for the purpose of private, scholarly or scientific research. This thesis, or any portion thereof, may not otherwise be copied or reproduced without the written consent of the copyright owner, except to the extent permitted by Canadian copyright law.
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