Analysis of buckling distortion in bead-on-plate Ti 6-4 welds
Abstract
Three-dimensional thermal-mechanical analyses of autogenous GTA bead-on-plate welds of Ti 6Al-4V have been performed. Sequential coupling of the thermal and mechanical analyses was employed. Predicted time-dependent temperature distributions from the thermal analysis code, JACQ3D, were provided as input to ATAQUS for the mechanical analysis. The heat input to the workpiece is modeled as a traveling Gaussian heat flux distribution. Thermal losses from the workpiece due to convection, radiation, and metal evaporation are included in the analysis. The material model is a bilinear temperature-dependent elastic-plastic model. The buckling distortion observed in the post-weld workpiece was successfully modeled using shell finite elements. A complete set of experimental data was obtained in this study to validate the numerical model. Computed thermal results compared favorably with measured temperatures (thermocouples and infrared thermography) and fusion zone shape. Real-time displacement data obtained from video cameras agreed well with predicted mechanical results. In particular, the initiation of buckling, which was observed in the displacement data, was captured in the simulation.
- Publication:
-
Presented at the Modeling of Casting
- Pub Date:
- 1995
- Bibcode:
- 1995mcwa.rept...10O
- Keywords:
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- Buckling;
- Gas Tungsten Arc Welding;
- Heat Flux;
- Mathematical Models;
- Metal Plates;
- Temperature Dependence;
- Tensile Deformation;
- Thermal Analysis;
- Time Dependence;
- Titanium Alloys;
- Welded Joints;
- Computerized Simulation;
- Convection;
- Evaporation;
- Finite Element Method;
- Infrared Radiation;
- Normal Density Functions;
- Real Time Operation;
- Temperature Distribution;
- Thermography;
- Structural Mechanics