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

• Author / Creator

  Lecoanet, Alexandre J L

• 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.

• Subjects / Keywords

  • Temperature measurement during submerged arc welding
  • Simulation of SAW
  • Finite-element-method
  • Modelling of submerged arc welding
  • Sensitivity analysis on SAW
  • Temperature profile
  • Temperature measurement during a welding operation
  • Varying thermal properties
  • Multiple electrode welding
  • Simulation with two point sources
  • Modelling temperature profile
  • Two electrode welding
  • FEM
  • Statistical analysis
  • Modelling temperature profile during SAW
  • Modelling temperature profile during submerged arc welding
  • Simulations
  • Bead shape parameters
  • Welding of X70
  • Modelling of SAW
  • Quasi-steady state
  • Instrumented thermocouples
  • FEM modelling of SAW
  • Sensitivity of the thermal properties
  • Sensitivity analysis on submerged arc welding
  • SAW
  • Welding with two electrodes
  • Point source
  • Infinite elements
  • Submerged arc welding
  • Application of infinite elements to welding
  • Simulation of welding with COMSOL
  • Temperature measurement during SAW
  • Modelling temperature profile during welding
  • Double ellipsoid source
  • Instrumented welds
  • Finite element method SAW
  • Welding
  • Thermal profile
  • Sensitivity analysis
  • Removing outliers
  • Welding of pipelines
  • Simulation of welding
  • Heat tranfer in moving coordinate system
  • Mixed boundary condition
  • Modelling
  • Heat transfer in welding

• Graduation date

  Fall 2016

• Type of Item

  Thesis

• Degree

  Master of Science

• DOI

  https://doi.org/10.7939/R3QB9VD4W

• License

  This thesis is made available by the University of Alberta Libraries with permission of the copyright owner solely for non-commercial purposes. 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.