Procedure in Reduction of Distortion in Welding Process by High Temperature Thermal Transient Tensioning

Welding is an aggressive thermal process which in its nature results in high strain and stress state of the material and leads to its phase change. This can cause high distortion in the welded structure what is often a significant design and manufacturing problem. This study deals with a lineheating forming process is applied while welding, with the final objective of minimizing the distortion. A FEM (finite element method) based on a thermo-elastoplastic approach is used here. The computational method is calibrated before in three stages, heatline forming calibration, flame heat source calibration, and weld process. The final model presented in this work will be an integration of all calibrated initial models. The tLSND (thermal low stress no distortion) technique will be designed to find an optimal solution for a long dimension T-joint.